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APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
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Copyright 2017 Karl Kroening
Licensed under the Apache License, Version 2.0 (the "License");
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# ffmpeg-go
# ffmpeg-go
ffmpeg-go is golang port of https://github.com/kkroening/ffmpeg-python
check examples/example_test.go and ffmpeg_test.go for more examples.
# Examples
```go
split := Input(TestInputFile1).VFlip().Split()
split0, split1 := split.Get("0"), split.Get("1")
overlayFile := Input(TestOverlayFile).Crop(10, 10, 158, 112)
err := Concat([]*Stream{
split0.Trim(KwArgs{"start_frame": 10, "end_frame": 20}),
split1.Trim(KwArgs{"start_frame": 30, "end_frame": 40})}).
Overlay(overlayFile.HFlip(), "").
DrawBox(50, 50, 120, 120, "red", 5).
Output(TestOutputFile1).
OverWriteOutput().
Run()
```
## Transcoding From One Codec To Another
```go
err := ffmpeg.Input("./sample_data/in1.mp4").
Output("./sample_data/out1.mp4", ffmpeg.KwArgs{"c:v": "libx265"}).
OverWriteOutput().ErrorToStdOut().Run()
```
## Cut Video From Timestamp
```go
err := ffmpeg.Input("./sample_data/in1.mp4", ffmpeg.KwArgs{"ss": 1}).
Output("./sample_data/out1.mp4", ffmpeg.KwArgs{"t": 1}).OverWriteOutput().Run()
assert.Nil(t, err)
```
## Add Watermark For Video
```go
// show watermark with size 64:-1 in the top left corner after seconds 1
overlay := ffmpeg.Input("./sample_data/overlay.png").Filter("scale", ffmpeg.Args{"64:-1"})
err := ffmpeg.Filter(
[]*ffmpeg.Stream{
ffmpeg.Input("./sample_data/in1.mp4"),
overlay,
}, "overlay", ffmpeg.Args{"10:10"}, ffmpeg.KwArgs{"enable": "gte(t,1)"}).
Output("./sample_data/out1.mp4").OverWriteOutput().ErrorToStdOut().Run()
```
result:
![img.png](./docs/example_overlay.png)
## Cut Video For Gif
```go
err := ffmpeg.Input("./sample_data/in1.mp4", ffmpeg.KwArgs{"ss": "1"}).
Output("./sample_data/out1.gif", ffmpeg.KwArgs{"s": "320x240", "pix_fmt": "rgb24", "t": "3", "r": "3"}).
OverWriteOutput().ErrorToStdOut().Run()
```
result:
![img.png](./docs/example_gif.gif)
## Task Frame From Video
```bash
func ExampleReadFrameAsJpeg(inFileName string, frameNum int) io.Reader {
buf := bytes.NewBuffer(nil)
err := ffmpeg.Input(inFileName).
Filter("select", ffmpeg.Args{fmt.Sprintf("gte(n,%d)", frameNum)}).
Output("pipe:", ffmpeg.KwArgs{"vframes": 1, "format": "image2", "vcodec": "mjpeg"}).
WithOutput(buf, os.Stdout).
Run()
if err != nil {
panic(err)
}
return buf
}
reader := ExampleReadFrameAsJpeg("./sample_data/in1.mp4", 5)
img, err := imaging.Decode(reader)
if err != nil {
t.Fatal(err)
}
err = imaging.Save(img, "./sample_data/out1.jpeg")
if err != nil {
t.Fatal(err)
}
```
result :
![image](./examples/sample_data/out1.jpeg)
## Get Multiple Output
```go
// get multiple output with different size/bitrate
input := ffmpeg.Input("./sample_data/in1.mp4").Split()
out1 := input.Get("0").Filter("scale", ffmpeg.Args{"1920:-1"}).
Output("./sample_data/1920.mp4", ffmpeg.KwArgs{"b:v": "5000k"})
out2 := input.Get("1").Filter("scale", ffmpeg.Args{"1280:-1"}).
Output("./sample_data/1280.mp4", ffmpeg.KwArgs{"b:v": "2800k"})
err := ffmpeg.MergeOutputs(out1, out2).OverWriteOutput().ErrorToStdOut().Run()
```
## Show FFmpeg Progress
see complete example at: [showProgress](./examples/showProgress.go)
```bash
func ExampleShowProgress(inFileName, outFileName string) {
a, err := ffmpeg.Probe(inFileName)
if err != nil {
panic(err)
}
totalDuration := gjson.Get(a, "format.duration").Float()
err = ffmpeg.Input(inFileName).
Output(outFileName, ffmpeg.KwArgs{"c:v": "libx264", "preset": "veryslow"}).
GlobalArgs("-progress", "unix://"+TempSock(totalDuration)).
OverWriteOutput().
Run()
if err != nil {
panic(err)
}
}
ExampleShowProgress("./sample_data/in1.mp4", "./sample_data/out2.mp4")
```
result
```bash
progress: .0
progress: 0.72
progress: 1.00
progress: done
```
## Integrate FFmpeg-go With Open-CV (gocv) For Face-detect
see complete example at: [opencv](./examples/opencv.go)
result: ![image](./examples/sample_data/face-detect.jpg)
## Set Cpu limit/request For FFmpeg-go
```go
e := ComplexFilterExample("./sample_data/in1.mp4", "./sample_data/overlay.png", "./sample_data/out2.mp4")
err := e.RunWithResource(0.1, 0.5)
if err != nil {
assert.Nil(t, err)
}
```
result from command top: we will see ffmpeg used 0.5 core as expected.
```bash
> top
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1386105 root 20 0 2114152 273780 31672 R 50.2 1.7 0:16.79 ffmpeg
```
# View Progress Graph
function view generate [mermaid](https://mermaid-js.github.io/mermaid/#/) chart, which can be use in markdown or view [online](https://mermaid-js.github.io/mermaid-live-editor/)
```go
split := Input(TestInputFile1).VFlip().Split()
split0, split1 := split.Get("0"), split.Get("1")
overlayFile := Input(TestOverlayFile).Crop(10, 10, 158, 112)
b, err := Concat([]*Stream{
split0.Trim(KwArgs{"start_frame": 10, "end_frame": 20}),
split1.Trim(KwArgs{"start_frame": 30, "end_frame": 40})}).
Overlay(overlayFile.HFlip(), "").
DrawBox(50, 50, 120, 120, "red", 5).
Output(TestOutputFile1).
OverWriteOutput().View(ViewTypeFlowChart)
fmt.Println(b)
```
![image](./docs/flowchart2.png)

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package ffmpeg_go
import (
"errors"
)
// Node in a directed-acyclic graph (DAG).
//
// Edges:
// DagNodes are connected by edges. An edge connects two nodes with a label for each side:
// - ``upstream_node``: upstream/parent node
// - ``upstream_label``: label on the outgoing side of the upstream node
// - ``downstream_node``: downstream/child node
// - ``downstream_label``: label on the incoming side of the downstream node
//
// For example, DagNode A may be connected to DagNode B with an edge labelled "foo" on A's side, and "bar" on B's
// side:
//
// _____ _____
// | | | |
// | A >[foo]---[bar]> B |
// |_____| |_____|
//
// Edge labels may be integers or strings, and nodes cannot have more than one incoming edge with the same label.
//
// DagNodes may have any number of incoming edges and any number of outgoing edges. DagNodes keep track only of
// their incoming edges, but the entire graph structure can be inferred by looking at the furthest downstream
// nodes and working backwards.
//
// Hashing:
// DagNodes must be hashable, and two nodes are considered to be equivalent if they have the same hash value.
//
// Nodes are immutable, and the hash should remain constant as a result. If a node with new contents is required,
// create a new node and throw the old one away.
//
// String representation:
// In order for graph visualization tools to show useful information, nodes must be representable as strings. The
// ``String`` operator should provide a more or less "full" representation of the node, and the ``ShortRepr``
// property should be a shortened, concise representation.
//
// Again, because nodes are immutable, the string representations should remain constant.
type DagNode interface {
Hash() int
// Compare two nodes
Equal(other DagNode) bool
// Return a full string representation of the node.
String() string
// Return a partial/concise representation of the node
ShortRepr() string
// Provides information about all incoming edges that connect to this node.
//
// The edge map is a dictionary that maps an ``incoming_label`` to ``(outgoing_node, outgoing_label)``. Note that
// implicity, ``incoming_node`` is ``self``. See "Edges" section above.
IncomingEdgeMap() map[Label]NodeInfo
}
type Label string
type NodeInfo struct {
Node DagNode
Label Label
Selector Selector
}
type Selector string
type DagEdge struct {
DownStreamNode DagNode
DownStreamLabel Label
UpStreamNode DagNode
UpStreamLabel Label
UpStreamSelector Selector
}
func GetInComingEdges(downStreamNode DagNode, inComingEdgeMap map[Label]NodeInfo) []DagEdge {
var edges []DagEdge
for _, downStreamLabel := range _getAllLabelsInSorted(inComingEdgeMap) {
upStreamInfo := inComingEdgeMap[downStreamLabel]
edges = append(edges, DagEdge{
DownStreamNode: downStreamNode,
DownStreamLabel: downStreamLabel,
UpStreamNode: upStreamInfo.Node,
UpStreamLabel: upStreamInfo.Label,
UpStreamSelector: upStreamInfo.Selector,
})
}
return edges
}
func GetOutGoingEdges(upStreamNode DagNode, outOutingEdgeMap map[Label][]NodeInfo) []DagEdge {
var edges []DagEdge
for _, upStreamLabel := range _getAllLabelsSorted(outOutingEdgeMap) {
downStreamInfos := outOutingEdgeMap[upStreamLabel]
for _, downStreamInfo := range downStreamInfos {
edges = append(edges, DagEdge{
DownStreamNode: downStreamInfo.Node,
DownStreamLabel: downStreamInfo.Label,
UpStreamNode: upStreamNode,
UpStreamLabel: upStreamLabel,
UpStreamSelector: downStreamInfo.Selector,
})
}
}
return edges
}
func TopSort(downStreamNodes []DagNode) (sortedNodes []DagNode, outOutingEdgeMaps map[int]map[Label][]NodeInfo, err error) {
markedNodes := map[int]struct{}{}
markedSortedNodes := map[int]struct{}{}
outOutingEdgeMaps = map[int]map[Label][]NodeInfo{}
var visit func(upStreamNode, downstreamNode DagNode, upStreamLabel, downStreamLabel Label, downStreamSelector Selector) error
visit = func(upStreamNode, downstreamNode DagNode, upStreamLabel, downStreamLabel Label, downStreamSelector Selector) error {
if _, ok := markedNodes[upStreamNode.Hash()]; ok {
return errors.New("graph if not DAG")
}
if downstreamNode != nil {
if a, ok := outOutingEdgeMaps[upStreamNode.Hash()]; !ok || a == nil {
outOutingEdgeMaps[upStreamNode.Hash()] = map[Label][]NodeInfo{}
}
outgoingEdgeMap := outOutingEdgeMaps[upStreamNode.Hash()]
outgoingEdgeMap[upStreamLabel] = append(outgoingEdgeMap[upStreamLabel], NodeInfo{
Node: downstreamNode,
Label: downStreamLabel,
Selector: downStreamSelector,
})
}
if _, ok := markedSortedNodes[upStreamNode.Hash()]; !ok {
markedNodes[upStreamNode.Hash()] = struct{}{}
for _, edge := range GetInComingEdges(upStreamNode, upStreamNode.IncomingEdgeMap()) {
err := visit(edge.UpStreamNode, edge.DownStreamNode, edge.UpStreamLabel, edge.DownStreamLabel, edge.UpStreamSelector)
if err != nil {
return err
}
}
delete(markedNodes, upStreamNode.Hash())
sortedNodes = append(sortedNodes, upStreamNode)
markedSortedNodes[upStreamNode.Hash()] = struct{}{}
}
return nil
}
for len(downStreamNodes) > 0 {
node := downStreamNodes[len(downStreamNodes)-1]
downStreamNodes = downStreamNodes[:len(downStreamNodes)-1]
err = visit(node, nil, "", "", "")
if err != nil {
return
}
}
return
}

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// +build debug
package ffmpeg_go
import (
"fmt"
"log"
"strings"
)
func DebugNodes(node []DagNode) {
b := strings.Builder{}
for _, n := range node {
b.WriteString(fmt.Sprintf("%s\n", n.String()))
}
log.Println(b.String())
}
func DebugOutGoingMap(node []DagNode, m map[int]map[Label][]NodeInfo) {
b := strings.Builder{}
h := map[int]DagNode{}
for _, n := range node {
h[n.Hash()] = n
}
for k, v := range m {
b.WriteString(fmt.Sprintf("[Key]: %s", h[k].String()))
b.WriteString(" [Value]: {")
for l, mm := range v {
if l == "" {
l = "None"
}
b.WriteString(fmt.Sprintf("%s: [", l))
for _, x := range mm {
b.WriteString(x.Node.String())
b.WriteString(", ")
}
b.WriteString("]")
}
b.WriteString("}")
b.WriteString("\n")
}
log.Println(b.String())
}

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// +build !debug
package ffmpeg_go
func DebugNodes(node []DagNode) {}
func DebugOutGoingMap(node []DagNode, m map[int]map[Label][]NodeInfo) {}

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package examples
import (
"testing"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/disintegration/imaging"
"github.com/stretchr/testify/assert"
ffmpeg "github.com/u2takey/ffmpeg-go"
)
//
// More simple examples please refer to ffmpeg_test.go
//
func TestExampleStream(t *testing.T) {
ExampleStream("./sample_data/in1.mp4", "./sample_data/out1.mp4", false)
}
func TestExampleReadFrameAsJpeg(t *testing.T) {
reader := ExampleReadFrameAsJpeg("./sample_data/in1.mp4", 5)
img, err := imaging.Decode(reader)
if err != nil {
t.Fatal(err)
}
err = imaging.Save(img, "./sample_data/out1.jpeg")
if err != nil {
t.Fatal(err)
}
}
func TestExampleShowProgress(t *testing.T) {
ExampleShowProgress("./sample_data/in1.mp4", "./sample_data/out2.mp4")
}
func TestSimpleS3StreamExample(t *testing.T) {
err := ffmpeg.Input("./sample_data/in1.mp4", nil).
Output("s3://data-1251825869/test_out.ts", ffmpeg.KwArgs{
"aws_config": &aws.Config{
Credentials: credentials.NewStaticCredentials("xx", "yyy", ""),
//Endpoint: aws.String("xx"),
Region: aws.String("yyy"),
},
// outputS3 use stream output, so you can only use supported format
// if you want mp4 format for example, you can output it to a file, and then call s3 sdk to do upload
"format": "mpegts",
}).
Run()
assert.Nil(t, err)
}
func TestExampleChangeCodec(t *testing.T) {
err := ffmpeg.Input("./sample_data/in1.mp4").
Output("./sample_data/out1.mp4", ffmpeg.KwArgs{"c:v": "libx265"}).
OverWriteOutput().ErrorToStdOut().Run()
assert.Nil(t, err)
}
func TestExampleCutVideo(t *testing.T) {
err := ffmpeg.Input("./sample_data/in1.mp4", ffmpeg.KwArgs{"ss": 1}).
Output("./sample_data/out1.mp4", ffmpeg.KwArgs{"t": 1}).OverWriteOutput().Run()
assert.Nil(t, err)
}
func TestExampleScaleVideo(t *testing.T) {
err := ffmpeg.Input("./sample_data/in1.mp4").
Output("./sample_data/out1.mp4", ffmpeg.KwArgs{"vf": "scale=w=480:h=240"}).
OverWriteOutput().ErrorToStdOut().Run()
assert.Nil(t, err)
}
func TestExampleAddWatermark(t *testing.T) {
// show watermark with size 64:-1 in the top left corner after seconds 1
overlay := ffmpeg.Input("./sample_data/overlay.png").Filter("scale", ffmpeg.Args{"64:-1"})
err := ffmpeg.Filter(
[]*ffmpeg.Stream{
ffmpeg.Input("./sample_data/in1.mp4"),
overlay,
}, "overlay", ffmpeg.Args{"10:10"}, ffmpeg.KwArgs{"enable": "gte(t,1)"}).
Output("./sample_data/out1.mp4").OverWriteOutput().ErrorToStdOut().Run()
assert.Nil(t, err)
}
func TestExampleCutVideoForGif(t *testing.T) {
err := ffmpeg.Input("./sample_data/in1.mp4", ffmpeg.KwArgs{"ss": "1"}).
Output("./sample_data/out1.gif", ffmpeg.KwArgs{"s": "320x240", "pix_fmt": "rgb24", "t": "3", "r": "3"}).
OverWriteOutput().ErrorToStdOut().Run()
assert.Nil(t, err)
}
func TestExampleMultipleOutput(t *testing.T) {
input := ffmpeg.Input("./sample_data/in1.mp4").Split()
out1 := input.Get("0").Filter("scale", ffmpeg.Args{"1920:-1"}).
Output("./sample_data/1920.mp4", ffmpeg.KwArgs{"b:v": "5000k"})
out2 := input.Get("1").Filter("scale", ffmpeg.Args{"1280:-1"}).
Output("./sample_data/1280.mp4", ffmpeg.KwArgs{"b:v": "2800k"})
err := ffmpeg.MergeOutputs(out1, out2).OverWriteOutput().ErrorToStdOut().Run()
assert.Nil(t, err)
}

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// +build gocv
// uncomment line above for gocv examples
package examples
import (
"encoding/json"
"fmt"
"image"
"image/color"
"io"
"log"
"testing"
ffmpeg "github.com/u2takey/ffmpeg-go"
"gocv.io/x/gocv"
)
func getVideoSize(fileName string) (int, int) {
log.Println("Getting video size for", fileName)
data, err := ffmpeg.Probe(fileName)
if err != nil {
panic(err)
}
log.Println("got video info", data)
type VideoInfo struct {
Streams []struct {
CodecType string `json:"codec_type"`
Width int
Height int
} `json:"streams"`
}
vInfo := &VideoInfo{}
err = json.Unmarshal([]byte(data), vInfo)
if err != nil {
panic(err)
}
for _, s := range vInfo.Streams {
if s.CodecType == "video" {
return s.Width, s.Height
}
}
return 0, 0
}
// TestExampleOpenCvFaceDetect will: take a video as input => use opencv for face detection => draw box and show a window
// This example depends on gocv and opencv, please refer: https://pkg.go.dev/gocv.io/x/gocv for installation.
// func TestExampleOpenCvFaceDetectWithVideo(t *testing.T) {
// inputFile := "./sample_data/head-pose-face-detection-male-short.mp4"
// xmlFile := "./sample_data/haarcascade_frontalface_default.xml"
// w, h := getVideoSize(inputFile)
// log.Println(w, h)
// pr1, pw1 := io.Pipe()
// readProcess(inputFile, pw1)
// openCvProcess(xmlFile, pr1, w, h)
// log.Println("Done")
// }
func readProcess(infileName string, writer io.WriteCloser) {
log.Println("Starting ffmpeg process1")
go func() {
err := ffmpeg.Input(infileName).
Output("pipe:",
ffmpeg.KwArgs{
"format": "rawvideo", "pix_fmt": "rgb24",
}).
WithOutput(writer).
ErrorToStdOut().
Run()
log.Println("ffmpeg process1 done")
_ = writer.Close()
if err != nil {
panic(err)
}
}()
return
}
func openCvProcess(xmlFile string, reader io.ReadCloser, w, h int) {
// open display window
window := gocv.NewWindow("Face Detect")
defer window.Close()
// color for the rect when faces detected
blue := color.RGBA{B: 255}
classifier := gocv.NewCascadeClassifier()
defer classifier.Close()
if !classifier.Load(xmlFile) {
fmt.Printf("Error reading cascade file: %v\n", xmlFile)
return
}
frameSize := w * h * 3
buf := make([]byte, frameSize, frameSize)
for {
n, err := io.ReadFull(reader, buf)
if n == 0 || err == io.EOF {
return
} else if n != frameSize || err != nil {
panic(fmt.Sprintf("read error: %d, %s", n, err))
}
img, err := gocv.NewMatFromBytes(h, w, gocv.MatTypeCV8UC3, buf)
if err != nil {
fmt.Println("decode fail", err)
}
if img.Empty() {
continue
}
img2 := gocv.NewMat()
gocv.CvtColor(img, &img2, gocv.ColorBGRToRGB)
// detect faces
rects := classifier.DetectMultiScale(img2)
fmt.Printf("found %d faces\n", len(rects))
// draw a rectangle around each face on the original image, along with text identifing as "Human"
for _, r := range rects {
gocv.Rectangle(&img2, r, blue, 3)
size := gocv.GetTextSize("Human", gocv.FontHersheyPlain, 1.2, 2)
pt := image.Pt(r.Min.X+(r.Min.X/2)-(size.X/2), r.Min.Y-2)
gocv.PutText(&img2, "Human", pt, gocv.FontHersheyPlain, 1.2, blue, 2)
}
// show the image in the window, and wait 1 millisecond
window.IMShow(img2)
img.Close()
img2.Close()
if window.WaitKey(10) >= 0 {
break
}
}
return
}
// TestExampleOpenCvFaceDetectWithCamera will: task stream from webcam => use opencv for face detection => output with ffmpeg
// This example depends on gocv and opencv, please refer: https://pkg.go.dev/gocv.io/x/gocv for installation.
func TestExampleOpenCvFaceDetectWithCamera(t *testing.T) {
// deviceID := "0" // camera device id
deviceID := "./sample_data/head-pose-face-detection-male-short.mp4"
xmlFile := "./sample_data/haarcascade_frontalface_default.xml"
webcam, err := gocv.OpenVideoCapture(deviceID)
if err != nil {
fmt.Printf("error opening video capture device: %v\n", deviceID)
return
}
defer webcam.Close()
// prepare image matrix
img := gocv.NewMat()
defer img.Close()
if ok := webcam.Read(&img); !ok {
panic(fmt.Sprintf("Cannot read device %v", deviceID))
}
fmt.Printf("img: %vX%v\n", img.Cols(), img.Rows())
pr1, pw1 := io.Pipe()
writeProcess("./sample_data/face_detect.mp4", pr1, img.Cols(), img.Rows())
// color for the rect when faces detected
blue := color.RGBA{B: 255}
// load classifier to recognize faces
classifier := gocv.NewCascadeClassifier()
defer classifier.Close()
if !classifier.Load(xmlFile) {
fmt.Printf("Error reading cascade file: %v\n", xmlFile)
return
}
fmt.Printf("Start reading device: %v\n", deviceID)
for i := 0; i < 200; i++ {
if ok := webcam.Read(&img); !ok {
fmt.Printf("Device closed: %v\n", deviceID)
return
}
if img.Empty() {
continue
}
// detect faces
rects := classifier.DetectMultiScale(img)
fmt.Printf("found %d faces\n", len(rects))
// draw a rectangle around each face on the original image, along with text identifing as "Human"
for _, r := range rects {
gocv.Rectangle(&img, r, blue, 3)
size := gocv.GetTextSize("Human", gocv.FontHersheyPlain, 1.2, 2)
pt := image.Pt(r.Min.X+(r.Min.X/2)-(size.X/2), r.Min.Y-2)
gocv.PutText(&img, "Human", pt, gocv.FontHersheyPlain, 1.2, blue, 2)
}
pw1.Write(img.ToBytes())
}
pw1.Close()
log.Println("Done")
}
func writeProcess(outputFile string, reader io.ReadCloser, w, h int) {
log.Println("Starting ffmpeg process1")
go func() {
err := ffmpeg.Input("pipe:",
ffmpeg.KwArgs{"format": "rawvideo",
"pix_fmt": "bgr24", "s": fmt.Sprintf("%dx%d", w, h),
}).
Overlay(ffmpeg.Input("./sample_data/overlay.png"), "").
Output(outputFile).
WithInput(reader).
ErrorToStdOut().
OverWriteOutput().
Run()
log.Println("ffmpeg process1 done")
if err != nil {
panic(err)
}
_ = reader.Close()
}()
}

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package examples
import (
"bytes"
"fmt"
"io"
"os"
ffmpeg "github.com/u2takey/ffmpeg-go"
)
func ExampleReadFrameAsJpeg(inFileName string, frameNum int) io.Reader {
buf := bytes.NewBuffer(nil)
err := ffmpeg.Input(inFileName).
Filter("select", ffmpeg.Args{fmt.Sprintf("gte(n,%d)", frameNum)}).
Output("pipe:", ffmpeg.KwArgs{"vframes": 1, "format": "image2", "vcodec": "mjpeg"}).
WithOutput(buf, os.Stdout).
Run()
if err != nil {
panic(err)
}
return buf
}

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package examples
import (
"encoding/json"
"fmt"
"log"
"math/rand"
"net"
"os"
"path"
"regexp"
"strconv"
"strings"
"time"
ffmpeg "github.com/u2takey/ffmpeg-go"
)
// ExampleShowProgress is an example of using the ffmpeg `-progress` option with a
// unix-domain socket to report progress
func ExampleShowProgress(inFileName, outFileName string) {
a, err := ffmpeg.Probe(inFileName)
if err != nil {
panic(err)
}
totalDuration, err := probeDuration(a)
if err != nil {
panic(err)
}
err = ffmpeg.Input(inFileName).
Output(outFileName, ffmpeg.KwArgs{"c:v": "libx264", "preset": "veryslow"}).
GlobalArgs("-progress", "unix://"+TempSock(totalDuration)).
OverWriteOutput().
Run()
if err != nil {
panic(err)
}
}
func TempSock(totalDuration float64) string {
// serve
rand.Seed(time.Now().Unix())
sockFileName := path.Join(os.TempDir(), fmt.Sprintf("%d_sock", rand.Int()))
l, err := net.Listen("unix", sockFileName)
if err != nil {
panic(err)
}
go func() {
re := regexp.MustCompile(`out_time_ms=(\d+)`)
fd, err := l.Accept()
if err != nil {
log.Fatal("accept error:", err)
}
buf := make([]byte, 16)
data := ""
progress := ""
for {
_, err := fd.Read(buf)
if err != nil {
return
}
data += string(buf)
a := re.FindAllStringSubmatch(data, -1)
cp := ""
if len(a) > 0 && len(a[len(a)-1]) > 0 {
c, _ := strconv.Atoi(a[len(a)-1][len(a[len(a)-1])-1])
cp = fmt.Sprintf("%.2f", float64(c)/totalDuration/1000000)
}
if strings.Contains(data, "progress=end") {
cp = "done"
}
if cp == "" {
cp = ".0"
}
if cp != progress {
progress = cp
fmt.Println("progress: ", progress)
}
}
}()
return sockFileName
}
type probeFormat struct {
Duration string `json:"duration"`
}
type probeData struct {
Format probeFormat `json:"format"`
}
func probeDuration(a string) (float64, error) {
pd := probeData{}
err := json.Unmarshal([]byte(a), &pd)
if err != nil {
return 0, err
}
f, err := strconv.ParseFloat(pd.Format.Duration, 64)
if err != nil {
return 0, err
}
return f, nil
}

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package examples
import (
"encoding/json"
"fmt"
"io"
"log"
ffmpeg "github.com/u2takey/ffmpeg-go"
)
// ExampleStream
// inFileName: input filename
// outFileName: output filename
// dream: Use DeepDream frame processing (requires tensorflow)
func ExampleStream(inFileName, outFileName string, dream bool) {
if inFileName == "" {
inFileName = "./in1.mp4"
}
if outFileName == "" {
outFileName = "./out.mp4"
}
if dream {
panic("Use DeepDream With Tensorflow haven't been implemented")
}
runExampleStream(inFileName, outFileName)
}
func getVideoSize(fileName string) (int, int) {
log.Println("Getting video size for", fileName)
data, err := ffmpeg.Probe(fileName)
if err != nil {
panic(err)
}
log.Println("got video info", data)
type VideoInfo struct {
Streams []struct {
CodecType string `json:"codec_type"`
Width int
Height int
} `json:"streams"`
}
vInfo := &VideoInfo{}
err = json.Unmarshal([]byte(data), vInfo)
if err != nil {
panic(err)
}
for _, s := range vInfo.Streams {
if s.CodecType == "video" {
return s.Width, s.Height
}
}
return 0, 0
}
func startFFmpegProcess1(infileName string, writer io.WriteCloser) <-chan error {
log.Println("Starting ffmpeg process1")
done := make(chan error)
go func() {
err := ffmpeg.Input(infileName).
Output("pipe:",
ffmpeg.KwArgs{
"format": "rawvideo", "pix_fmt": "rgb24",
}).
WithOutput(writer).
Run()
log.Println("ffmpeg process1 done")
_ = writer.Close()
done <- err
close(done)
}()
return done
}
func startFFmpegProcess2(outfileName string, buf io.Reader, width, height int) <-chan error {
log.Println("Starting ffmpeg process2")
done := make(chan error)
go func() {
err := ffmpeg.Input("pipe:",
ffmpeg.KwArgs{"format": "rawvideo",
"pix_fmt": "rgb24", "s": fmt.Sprintf("%dx%d", width, height),
}).
Output(outfileName, ffmpeg.KwArgs{"pix_fmt": "yuv420p"}).
OverWriteOutput().
WithInput(buf).
Run()
log.Println("ffmpeg process2 done")
done <- err
close(done)
}()
return done
}
func process(reader io.ReadCloser, writer io.WriteCloser, w, h int) {
go func() {
frameSize := w * h * 3
buf := make([]byte, frameSize, frameSize)
for {
n, err := io.ReadFull(reader, buf)
if n == 0 || err == io.EOF {
_ = writer.Close()
return
} else if n != frameSize || err != nil {
panic(fmt.Sprintf("read error: %d, %s", n, err))
}
for i := range buf {
buf[i] = buf[i] / 3
}
n, err = writer.Write(buf)
if n != frameSize || err != nil {
panic(fmt.Sprintf("write error: %d, %s", n, err))
}
}
}()
return
}
func runExampleStream(inFile, outFile string) {
w, h := getVideoSize(inFile)
log.Println(w, h)
pr1, pw1 := io.Pipe()
pr2, pw2 := io.Pipe()
done1 := startFFmpegProcess1(inFile, pw1)
process(pr1, pw2, w, h)
done2 := startFFmpegProcess2(outFile, pr2, w, h)
err := <-done1
if err != nil {
panic(err)
}
err = <-done2
if err != nil {
panic(err)
}
log.Println("Done")
}

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//+build linux
package examples
import (
"testing"
"github.com/stretchr/testify/assert"
ffmpeg "github.com/u2takey/ffmpeg-go"
)
func ComplexFilterExample(testInputFile, testOverlayFile, testOutputFile string) *ffmpeg.Stream {
split := ffmpeg.Input(testInputFile).VFlip().Split()
split0, split1 := split.Get("0"), split.Get("1")
overlayFile := ffmpeg.Input(testOverlayFile).Crop(10, 10, 158, 112)
return ffmpeg.Concat([]*ffmpeg.Stream{
split0.Trim(ffmpeg.KwArgs{"start_frame": 10, "end_frame": 20}),
split1.Trim(ffmpeg.KwArgs{"start_frame": 30, "end_frame": 40})}).
Overlay(overlayFile.HFlip(), "").
DrawBox(50, 50, 120, 120, "red", 5).
Output(testOutputFile).
OverWriteOutput()
}
// PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
// 1386105 root 20 0 2114152 273780 31672 R 50.2 1.7 0:16.79 ffmpeg
func TestLimitCpu(t *testing.T) {
e := ComplexFilterExample("./sample_data/in1.mp4", "./sample_data/overlay.png", "./sample_data/out2.mp4")
err := e.WithCpuCoreRequest(0.1).WithCpuCoreLimit(0.5).RunLinux()
if err != nil {
assert.Nil(t, err)
}
}

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package ffmpeg_go
import (
"context"
"errors"
"io"
"log"
"os"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
)
// Input file URL (ffmpeg ``-i`` option)
//
// Any supplied kwargs are passed to ffmpeg verbatim (e.g. ``t=20``,
// ``f='mp4'``, ``acodec='pcm'``, etc.).
//
// To tell ffmpeg to read from stdin, use ``pipe:`` as the filename.
//
// Official documentation: `Main options <https://ffmpeg.org/ffmpeg.html#Main-options>`__
func Input(filename string, kwargs ...KwArgs) *Stream {
args := MergeKwArgs(kwargs)
args["filename"] = filename
if fmt := args.PopString("f"); fmt != "" {
if args.HasKey("format") {
panic(errors.New("can't specify both `format` and `f` options"))
}
args["format"] = fmt
}
return NewInputNode("input", nil, args).Stream("", "")
}
// Add extra global command-line argument(s), e.g. ``-progress``.
func (s *Stream) GlobalArgs(args ...string) *Stream {
if s.Type != "OutputStream" {
panic("cannot overwrite outputs on non-OutputStream")
}
return NewGlobalNode("global_args", []*Stream{s}, args, nil).Stream("", "")
}
// Overwrite output files without asking (ffmpeg ``-y`` option)
//
// Official documentation: `Main options <https://ffmpeg.org/ffmpeg.html#Main-options>`_
func (s *Stream) OverwriteOutput(stream *Stream) *Stream {
if s.Type != "OutputStream" {
panic("cannot overwrite outputs on non-OutputStream")
}
return NewGlobalNode("overwrite_output", []*Stream{stream}, []string{"-y"}, nil).Stream("", "")
}
// Include all given outputs in one ffmpeg command line
func MergeOutputs(streams ...*Stream) *Stream {
return NewMergeOutputsNode("merge_output", streams).Stream("", "")
}
//Output file URL
//
// Syntax:
// `ffmpeg.Output([]*Stream{stream1, stream2, stream3...}, filename, kwargs)`
//
// Any supplied keyword arguments are passed to ffmpeg verbatim (e.g.
// ``t=20``, ``f='mp4'``, ``acodec='pcm'``, ``vcodec='rawvideo'``,
// etc.). Some keyword-arguments are handled specially, as shown below.
//
// Args:
// video_bitrate: parameter for ``-b:v``, e.g. ``video_bitrate=1000``.
// audio_bitrate: parameter for ``-b:a``, e.g. ``audio_bitrate=200``.
// format: alias for ``-f`` parameter, e.g. ``format='mp4'``
// (equivalent to ``f='mp4'``).
//
// If multiple streams are provided, they are mapped to the same
// output.
//
// To tell ffmpeg to write to stdout, use ``pipe:`` as the filename.
//
// Official documentation: `Synopsis <https://ffmpeg.org/ffmpeg.html#Synopsis>`__
// """
func Output(streams []*Stream, fileName string, kwargs ...KwArgs) *Stream {
args := MergeKwArgs(kwargs)
if !args.HasKey("filename") {
if fileName == "" {
panic("filename must be provided")
}
args["filename"] = fileName
}
return NewOutputNode("output", streams, nil, args).Stream("", "")
}
func (s *Stream) Output(fileName string, kwargs ...KwArgs) *Stream {
if s.Type != "FilterableStream" {
log.Panic("cannot output on non-FilterableStream")
}
if strings.HasPrefix(fileName, "s3://") {
return s.outputS3Stream(fileName, kwargs...)
}
return Output([]*Stream{s}, fileName, kwargs...)
}
func (s *Stream) outputS3Stream(fileName string, kwargs ...KwArgs) *Stream {
r, w := io.Pipe()
fileL := strings.SplitN(strings.TrimPrefix(fileName, "s3://"), "/", 2)
if len(fileL) != 2 {
log.Panic("s3 file format not valid")
}
args := MergeKwArgs(kwargs)
awsConfig := args.PopDefault("aws_config", &aws.Config{}).(*aws.Config)
bucket, key := fileL[0], fileL[1]
o := Output([]*Stream{s}, "pipe:", args).
WithOutput(w, os.Stdout)
done := make(chan struct{})
runHook := RunHook{
f: func() {
defer func() {
done <- struct{}{}
}()
sess, err := session.NewSession(awsConfig)
uploader := s3manager.NewUploader(sess)
_, err = uploader.Upload(&s3manager.UploadInput{
Bucket: &bucket,
Key: &key,
Body: r,
})
//fmt.Println(ioutil.ReadAll(r))
if err != nil {
log.Println("upload fail", err)
}
},
done: done,
closer: w,
}
o.Context = context.WithValue(o.Context, "run_hook", &runHook)
return o
}

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package ffmpeg_go
import (
"bytes"
"fmt"
"testing"
"github.com/stretchr/testify/assert"
"github.com/u2takey/go-utils/rand"
)
const (
TestInputFile1 = "./examples/sample_data/in1.mp4"
TestOutputFile1 = "./examples/sample_data/out1.mp4"
TestOverlayFile = "./examples/sample_data/overlay.png"
)
func TestFluentEquality(t *testing.T) {
base1 := Input("dummy1.mp4")
base2 := Input("dummy1.mp4")
base3 := Input("dummy2.mp4")
t1 := base1.Trim(KwArgs{"start_frame": 10, "end_frame": 20})
t2 := base1.Trim(KwArgs{"start_frame": 10, "end_frame": 20})
t3 := base1.Trim(KwArgs{"start_frame": 10, "end_frame": 30})
t4 := base2.Trim(KwArgs{"start_frame": 10, "end_frame": 20})
t5 := base3.Trim(KwArgs{"start_frame": 10, "end_frame": 20})
assert.Equal(t, t1.Hash(), t2.Hash())
assert.Equal(t, t1.Hash(), t4.Hash())
assert.NotEqual(t, t1.Hash(), t3.Hash())
assert.NotEqual(t, t1.Hash(), t5.Hash())
}
func TestFluentConcat(t *testing.T) {
base1 := Input("dummy1.mp4", nil)
trim1 := base1.Trim(KwArgs{"start_frame": 10, "end_frame": 20})
trim2 := base1.Trim(KwArgs{"start_frame": 30, "end_frame": 40})
trim3 := base1.Trim(KwArgs{"start_frame": 50, "end_frame": 60})
concat1 := Concat([]*Stream{trim1, trim2, trim3})
concat2 := Concat([]*Stream{trim1, trim2, trim3})
concat3 := Concat([]*Stream{trim1, trim3, trim2})
assert.Equal(t, concat1.Hash(), concat2.Hash())
assert.NotEqual(t, concat1.Hash(), concat3.Hash())
}
func TestRepeatArgs(t *testing.T) {
o := Input("dummy.mp4", nil).Output("dummy2.mp4",
KwArgs{"streamid": []string{"0:0x101", "1:0x102"}})
assert.Equal(t, o.GetArgs(), []string{"-i", "dummy.mp4", "-streamid", "0:0x101", "-streamid", "1:0x102", "dummy2.mp4"})
}
func TestGlobalArgs(t *testing.T) {
o := Input("dummy.mp4", nil).Output("dummy2.mp4", nil).GlobalArgs("-progress", "someurl")
assert.Equal(t, o.GetArgs(), []string{
"-i",
"dummy.mp4",
"dummy2.mp4",
"-progress",
"someurl",
})
}
func TestSimpleExample(t *testing.T) {
err := Input(TestInputFile1, nil).
Output(TestOutputFile1, nil).
OverWriteOutput().
Run()
assert.Nil(t, err)
}
func TestSimpleOverLayExample(t *testing.T) {
err := Input(TestInputFile1, nil).
Overlay(Input(TestOverlayFile), "").
Output(TestOutputFile1).OverWriteOutput().
Run()
assert.Nil(t, err)
}
func TestSimpleOutputArgs(t *testing.T) {
cmd := Input(TestInputFile1).Output("imageFromVideo_%d.jpg", KwArgs{"vf": "fps=3", "qscale:v": 2})
assert.Equal(t, []string{
"-i", "./examples/sample_data/in1.mp4", "-qscale:v",
"2", "-vf", "fps=3", "imageFromVideo_%d.jpg"}, cmd.GetArgs())
}
func TestAutomaticStreamSelection(t *testing.T) {
// example from http://ffmpeg.org/ffmpeg-all.html
input := []*Stream{Input("A.avi"), Input("B.mp4")}
out1 := Output(input, "out1.mkv")
out2 := Output(input, "out2.wav")
out3 := Output(input, "out3.mov", KwArgs{"map": "1:a", "c:a": "copy"})
cmd := MergeOutputs(out1, out2, out3)
printArgs(cmd.GetArgs())
printGraph(cmd)
}
func TestLabeledFiltergraph(t *testing.T) {
// example from http://ffmpeg.org/ffmpeg-all.html
in1, in2, in3 := Input("A.avi"), Input("B.mp4"), Input("C.mkv")
in2Split := in2.Get("v").Hue(KwArgs{"s": 0}).Split()
overlay := Filter([]*Stream{in1, in2}, "overlay", nil)
aresample := Filter([]*Stream{in1, in2, in3}, "aresample", nil)
out1 := Output([]*Stream{in2Split.Get("outv1"), overlay, aresample}, "out1.mp4", KwArgs{"an": ""})
out2 := Output([]*Stream{in1, in2, in3}, "out2.mkv")
out3 := in2Split.Get("outv2").Output("out3.mkv", KwArgs{"map": "1:a:0"})
cmd := MergeOutputs(out1, out2, out3)
printArgs(cmd.GetArgs())
printGraph(cmd)
}
func ComplexFilterExample() *Stream {
split := Input(TestInputFile1).VFlip().Split()
split0, split1 := split.Get("0"), split.Get("1")
overlayFile := Input(TestOverlayFile).Crop(10, 10, 158, 112)
return Concat([]*Stream{
split0.Trim(KwArgs{"start_frame": 10, "end_frame": 20}),
split1.Trim(KwArgs{"start_frame": 30, "end_frame": 40})}).
Overlay(overlayFile.HFlip(), "").
DrawBox(50, 50, 120, 120, "red", 5).
Output(TestOutputFile1).
OverWriteOutput()
}
func TestComplexFilterExample(t *testing.T) {
assert.Equal(t, []string{
"-i",
TestInputFile1,
"-i",
TestOverlayFile,
"-filter_complex",
"[0]vflip[s0];" +
"[s0]split=2[s1][s2];" +
"[s1]trim=end_frame=20:start_frame=10[s3];" +
"[s2]trim=end_frame=40:start_frame=30[s4];" +
"[s3][s4]concat=n=2[s5];" +
"[1]crop=158:112:10:10[s6];" +
"[s6]hflip[s7];" +
"[s5][s7]overlay=eof_action=repeat[s8];" +
"[s8]drawbox=50:50:120:120:red:t=5[s9]",
"-map",
"[s9]",
TestOutputFile1,
"-y",
}, ComplexFilterExample().GetArgs())
}
func TestCombinedOutput(t *testing.T) {
i1 := Input(TestInputFile1)
i2 := Input(TestOverlayFile)
out := Output([]*Stream{i1, i2}, TestOutputFile1)
assert.Equal(t, []string{
"-i",
TestInputFile1,
"-i",
TestOverlayFile,
"-map",
"0",
"-map",
"1",
TestOutputFile1,
}, out.GetArgs())
}
func TestFilterWithSelector(t *testing.T) {
i := Input(TestInputFile1)
v1 := i.Video().HFlip()
a1 := i.Audio().Filter("aecho", Args{"0.8", "0.9", "1000", "0.3"})
out := Output([]*Stream{a1, v1}, TestOutputFile1)
assert.Equal(t, []string{
"-i",
TestInputFile1,
"-filter_complex",
"[0:a]aecho=0.8:0.9:1000:0.3[s0];[0:v]hflip[s1]",
"-map",
"[s0]",
"-map",
"[s1]",
TestOutputFile1}, out.GetArgs())
}
func ComplexFilterAsplitExample() *Stream {
split := Input(TestInputFile1).VFlip().ASplit()
split0 := split.Get("0")
split1 := split.Get("1")
return Concat([]*Stream{
split0.Filter("atrim", nil, KwArgs{"start": 10, "end": 20}),
split1.Filter("atrim", nil, KwArgs{"start": 30, "end": 40}),
}).Output(TestOutputFile1).OverWriteOutput()
}
func TestFilterConcatVideoOnly(t *testing.T) {
in1 := Input("in1.mp4")
in2 := Input("in2.mp4")
args := Concat([]*Stream{in1, in2}).Output("out.mp4").GetArgs()
assert.Equal(t, []string{
"-i",
"in1.mp4",
"-i",
"in2.mp4",
"-filter_complex",
"[0][1]concat=n=2[s0]",
"-map",
"[s0]",
"out.mp4",
}, args)
}
func TestFilterConcatAudioOnly(t *testing.T) {
in1 := Input("in1.mp4")
in2 := Input("in2.mp4")
args := Concat([]*Stream{in1, in2}, KwArgs{"v": 0, "a": 1}).Output("out.mp4").GetArgs()
assert.Equal(t, []string{
"-i",
"in1.mp4",
"-i",
"in2.mp4",
"-filter_complex",
"[0][1]concat=a=1:n=2:v=0[s0]",
"-map",
"[s0]",
"out.mp4",
}, args)
}
func TestFilterConcatAudioVideo(t *testing.T) {
in1 := Input("in1.mp4")
in2 := Input("in2.mp4")
joined := Concat([]*Stream{in1.Video(), in1.Audio(), in2.HFlip(), in2.Get("a")}, KwArgs{"v": 1, "a": 1}).Node
args := Output([]*Stream{joined.Get("0"), joined.Get("1")}, "out.mp4").GetArgs()
assert.Equal(t, []string{
"-i",
"in1.mp4",
"-i",
"in2.mp4",
"-filter_complex",
"[1]hflip[s0];[0:v][0:a][s0][1:a]concat=a=1:n=2:v=1[s1][s2]",
"-map",
"[s1]",
"-map",
"[s2]",
"out.mp4",
}, args)
}
func TestFilterASplit(t *testing.T) {
out := ComplexFilterAsplitExample()
args := out.GetArgs()
assert.Equal(t, []string{
"-i",
TestInputFile1,
"-filter_complex",
"[0]vflip[s0];[s0]asplit=2[s1][s2];[s1]atrim=end=20:start=10[s3];[s2]atrim=end=40:start=30[s4];[s3][s4]concat=n=2[s5]",
"-map",
"[s5]",
TestOutputFile1,
"-y",
}, args)
}
func TestOutputBitrate(t *testing.T) {
args := Input("in").Output("out", KwArgs{"video_bitrate": 1000, "audio_bitrate": 200}).GetArgs()
assert.Equal(t, []string{"-i", "in", "-b:v", "1000", "-b:a", "200", "out"}, args)
}
func TestOutputVideoSize(t *testing.T) {
args := Input("in").Output("out", KwArgs{"video_size": "320x240"}).GetArgs()
assert.Equal(t, []string{"-i", "in", "-video_size", "320x240", "out"}, args)
}
func TestCompile(t *testing.T) {
out := Input("dummy.mp4").Output("dummy2.mp4")
assert.Equal(t, out.Compile().Args, []string{"ffmpeg", "-i", "dummy.mp4", "dummy2.mp4"})
}
func TestPipe(t *testing.T) {
width, height := 32, 32
frameSize := width * height * 3
frameCount, startFrame := 10, 2
_, _ = frameCount, frameSize
out := Input(
"pipe:0",
KwArgs{
"format": "rawvideo",
"pixel_format": "rgb24",
"video_size": fmt.Sprintf("%dx%d", width, height),
"framerate": 10}).
Trim(KwArgs{"start_frame": startFrame}).
Output("pipe:1", KwArgs{"format": "rawvideo"})
args := out.GetArgs()
assert.Equal(t, args, []string{
"-f",
"rawvideo",
"-video_size",
fmt.Sprintf("%dx%d", width, height),
"-framerate",
"10",
"-pixel_format",
"rgb24",
"-i",
"pipe:0",
"-filter_complex",
"[0]trim=start_frame=2[s0]",
"-map",
"[s0]",
"-f",
"rawvideo",
"pipe:1",
})
inBuf := bytes.NewBuffer(nil)
for i := 0; i < frameSize*frameCount; i++ {
inBuf.WriteByte(byte(rand.IntnRange(0, 255)))
}
outBuf := bytes.NewBuffer(nil)
err := out.WithInput(inBuf).WithOutput(outBuf).Run()
assert.Nil(t, err)
assert.Equal(t, outBuf.Len(), frameSize*(frameCount-startFrame))
}
func TestView(t *testing.T) {
a, err := ComplexFilterExample().View(ViewTypeFlowChart)
assert.Nil(t, err)
b, err := ComplexFilterAsplitExample().View(ViewTypeStateDiagram)
assert.Nil(t, err)
t.Log(a)
t.Log(b)
}
func printArgs(args []string) {
for _, a := range args {
fmt.Printf("%s ", a)
}
fmt.Println()
}
func printGraph(s *Stream) {
fmt.Println()
v, _ := s.View(ViewTypeFlowChart)
fmt.Println(v)
}
//func TestAvFoundation(t *testing.T) {
// out := Input("default:none", KwArgs{"f": "avfoundation", "framerate": "30"}).
// Output("output.mp4", KwArgs{"format": "mp4"}).
// OverWriteOutput()
// assert.Equal(t, []string{"-f", "avfoundation", "-framerate",
// "30", "-i", "default:none", "-f", "mp4", "output.mp4", "-y"}, out.GetArgs())
// err := out.Run()
// assert.Nil(t, err)
//}

135
filters.go Normal file
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package ffmpeg_go
import (
"fmt"
"strconv"
)
func AssertType(hasType, expectType string, action string) {
if hasType != expectType {
panic(fmt.Sprintf("cannot %s on non-%s", action, expectType))
}
}
func FilterMultiOutput(streamSpec []*Stream, filterName string, args Args, kwArgs ...KwArgs) *Node {
return NewFilterNode(filterName, streamSpec, -1, args, MergeKwArgs(kwArgs))
}
func Filter(streamSpec []*Stream, filterName string, args Args, kwArgs ...KwArgs) *Stream {
return FilterMultiOutput(streamSpec, filterName, args, MergeKwArgs(kwArgs)).Stream("", "")
}
func (s *Stream) Filter(filterName string, args Args, kwArgs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "filter")
return Filter([]*Stream{s}, filterName, args, MergeKwArgs(kwArgs))
}
func (s *Stream) Split() *Node {
AssertType(s.Type, "FilterableStream", "split")
return NewFilterNode("split", []*Stream{s}, 1, nil, nil)
}
func (s *Stream) ASplit() *Node {
AssertType(s.Type, "FilterableStream", "asplit")
return NewFilterNode("asplit", []*Stream{s}, 1, nil, nil)
}
func (s *Stream) SetPts(expr string) *Node {
AssertType(s.Type, "FilterableStream", "setpts")
return NewFilterNode("setpts", []*Stream{s}, 1, []string{expr}, nil)
}
func (s *Stream) Trim(kwargs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "trim")
return NewFilterNode("trim", []*Stream{s}, 1, nil, MergeKwArgs(kwargs)).Stream("", "")
}
func (s *Stream) Overlay(overlayParentNode *Stream, eofAction string, kwargs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "overlay")
if eofAction == "" {
eofAction = "repeat"
}
args := MergeKwArgs(kwargs)
args["eof_action"] = eofAction
return NewFilterNode("overlay", []*Stream{s, overlayParentNode}, 2, nil, args).Stream("", "")
}
func (s *Stream) HFlip(kwargs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "hflip")
return NewFilterNode("hflip", []*Stream{s}, 1, nil, MergeKwArgs(kwargs)).Stream("", "")
}
func (s *Stream) VFlip(kwargs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "vflip")
return NewFilterNode("vflip", []*Stream{s}, 1, nil, MergeKwArgs(kwargs)).Stream("", "")
}
func (s *Stream) Crop(x, y, w, h int, kwargs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "crop")
return NewFilterNode("crop", []*Stream{s}, 1, []string{
strconv.Itoa(w), strconv.Itoa(h), strconv.Itoa(x), strconv.Itoa(y),
}, MergeKwArgs(kwargs)).Stream("", "")
}
func (s *Stream) DrawBox(x, y, w, h int, color string, thickness int, kwargs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "drawbox")
args := MergeKwArgs(kwargs)
if thickness != 0 {
args["t"] = thickness
}
return NewFilterNode("drawbox", []*Stream{s}, 1, []string{
strconv.Itoa(x), strconv.Itoa(y), strconv.Itoa(w), strconv.Itoa(h), color,
}, args).Stream("", "")
}
func (s *Stream) Drawtext(text string, x, y int, escape bool, kwargs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "drawtext")
args := MergeKwArgs(kwargs)
if escape {
text = fmt.Sprintf("%q", text)
}
if text != "" {
args["text"] = text
}
if x != 0 {
args["x"] = x
}
if y != 0 {
args["y"] = y
}
return NewFilterNode("drawtext", []*Stream{s}, 1, nil, args).Stream("", "")
}
func Concat(streams []*Stream, kwargs ...KwArgs) *Stream {
args := MergeKwArgs(kwargs)
vsc := args.GetDefault("v", 1).(int)
asc := args.GetDefault("a", 0).(int)
sc := vsc + asc
if len(streams)%sc != 0 {
panic("streams count not valid")
}
args["n"] = len(streams) / sc
return NewFilterNode("concat", streams, -1, nil, args).Stream("", "")
}
func (s *Stream) Concat(streams []*Stream, kwargs ...KwArgs) *Stream {
return Concat(append(streams, s), MergeKwArgs(kwargs))
}
func (s *Stream) ZoomPan(kwargs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "zoompan")
return NewFilterNode("zoompan", []*Stream{s}, 1, nil, MergeKwArgs(kwargs)).Stream("", "")
}
func (s *Stream) Hue(kwargs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "hue")
return NewFilterNode("hue", []*Stream{s}, 1, nil, MergeKwArgs(kwargs)).Stream("", "")
}
// todo fix this
func (s *Stream) ColorChannelMixer(kwargs ...KwArgs) *Stream {
AssertType(s.Type, "FilterableStream", "colorchannelmixer")
return NewFilterNode("colorchannelmixer", []*Stream{s}, 1, nil, MergeKwArgs(kwargs)).Stream("", "")
}

11
go.mod Normal file
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@@ -0,0 +1,11 @@
module github.com/u2takey/ffmpeg-go
go 1.14
require (
github.com/aws/aws-sdk-go v1.38.20
github.com/disintegration/imaging v1.6.2
github.com/stretchr/testify v1.4.0
github.com/u2takey/go-utils v0.0.0-20200713025200-4704d09fc2c7
gocv.io/x/gocv v0.25.0
)

61
go.sum Normal file
View File

@@ -0,0 +1,61 @@
github.com/aws/aws-sdk-go v1.38.20 h1:QbzNx/tdfATbdKfubBpkt84OM6oBkxQZRw6+bW2GyeA=
github.com/aws/aws-sdk-go v1.38.20/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/disintegration/imaging v1.6.2 h1:w1LecBlG2Lnp8B3jk5zSuNqd7b4DXhcjwek1ei82L+c=
github.com/disintegration/imaging v1.6.2/go.mod h1:44/5580QXChDfwIclfc/PCwrr44amcmDAg8hxG0Ewe4=
github.com/docker/distribution v2.7.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7sIas=
github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo=
github.com/jmespath/go-jmespath/internal/testify v1.5.1 h1:shLQSRRSCCPj3f2gpwzGwWFoC7ycTf1rcQZHOlsJ6N8=
github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U=
github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/opencontainers/go-digest v1.0.0-rc1/go.mod h1:cMLVZDEM3+U2I4VmLI6N8jQYUd2OVphdqWwCJHrFt2s=
github.com/opencontainers/selinux v1.5.2/go.mod h1:yTcKuYAh6R95iDpefGLQaPaRwJFwyzAJufJyiTt7s0g=
github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
github.com/u2takey/go-utils v0.0.0-20200713025200-4704d09fc2c7 h1:PT7mE8HJE1mwaSazrOdSeByJ1FoV33/fHUZrBB+zwVU=
github.com/u2takey/go-utils v0.0.0-20200713025200-4704d09fc2c7/go.mod h1:ATqKFpgjUIlhGRs8j59gXmu8Cmpo1QQEHV6vwu1hs28=
gocv.io/x/gocv v0.25.0 h1:vM50jL3v9OEqWSi+urelX5M1ptZeFWA/VhGPvdTqsJU=
gocv.io/x/gocv v0.25.0/go.mod h1:Rar2PS6DV+T4FL+PM535EImD/h13hGVaHhnCu1xarBs=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8 h1:hVwzHzIUGRjiF7EcUjqNxk3NCfkPxbDKRdnNE1Rpg0U=
golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20201110031124-69a78807bb2b h1:uwuIcX0g4Yl1NC5XAz37xsr2lTtcqevgzYNVt49waME=
golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20191115151921-52ab43148777/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

24
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package ffmpeg_go
import "time"
// for json spec
type GraphNode struct {
Name string `json:"name"`
InputStreams []string `json:"input_streams"`
OutputStreams []string `json:"output_streams"`
Args Args `json:"args"`
KwArgs KwArgs `json:"kw_args"`
}
type GraphOptions struct {
Timeout time.Duration
OverWriteOutput bool
}
type Graph struct {
OutputStream string `json:"output_stream"`
GraphOptions GraphOptions `json:"graph_options"`
Nodes []GraphNode `json:"nodes"`
}

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package main
import (
"encoding/json"
"fmt"
"image"
"image/color"
"io"
"log"
"os"
ffmpeg "github.com/u2takey/ffmpeg-go"
"gocv.io/x/gocv"
)
func getVideoSize(fileName string) (int, int) {
log.Println("Getting video size for", fileName)
data, err := ffmpeg.Probe(fileName)
if err != nil {
panic(err)
}
log.Println("got video info", data)
type VideoInfo struct {
Streams []struct {
CodecType string `json:"codec_type"`
Width int
Height int
} `json:"streams"`
}
vInfo := &VideoInfo{}
err = json.Unmarshal([]byte(data), vInfo)
if err != nil {
panic(err)
}
for _, s := range vInfo.Streams {
if s.CodecType == "video" {
return s.Width, s.Height
}
}
return 0, 0
}
func startFFmpegProcess1(infileName string, writer io.WriteCloser) <-chan error {
log.Println("Starting ffmpeg process1")
done := make(chan error)
go func() {
err := ffmpeg.Input(infileName).
Output("pipe:",
ffmpeg.KwArgs{
"format": "rawvideo", "pix_fmt": "bgr24",
}).
WithOutput(writer).
Run()
log.Println("ffmpeg process1 done")
_ = writer.Close()
done <- err
close(done)
}()
return done
}
func process(reader io.ReadCloser, writer io.WriteCloser, w, h int) {
go func() {
frameSize := w * h * 3
buf := make([]byte, frameSize, frameSize)
for {
n, err := io.ReadFull(reader, buf)
if n == 0 || err == io.EOF {
_ = writer.Close()
return
} else if n != frameSize || err != nil {
panic(fmt.Sprintf("read error: %d, %s", n, err))
}
////if this open, the video picture will be gray
// for i := range buf {
// buf[i] = buf[i] / 3
// }
n, err = writer.Write(buf)
if n != frameSize || err != nil {
panic(fmt.Sprintf("write error: %d, %s", n, err))
}
}
}()
return
}
func startFFmpegProcess2(outfileName string, buf io.Reader, width, height int) <-chan error {
log.Println("Starting ffmpeg process2")
done := make(chan error)
go func() {
err := ffmpeg.Input("pipe:",
ffmpeg.KwArgs{"format": "rawvideo",
"pix_fmt": "bgr24", "s": fmt.Sprintf("%dx%d", width, height),
}).
Output(outfileName, ffmpeg.KwArgs{
"pix_fmt": "yuv420p", "c:v": "libx264", "preset": "ultrafast", "f": "flv", "r": "25",
}).
OverWriteOutput().
WithInput(buf).
Run()
log.Println("ffmpeg process2 done")
done <- err
close(done)
}()
return done
}
func runExampleStream(inFile, outFile string) {
w, h := getVideoSize(inFile)
log.Println(w, h)
pr1, pw1 := io.Pipe()
pr2, pw2 := io.Pipe()
done1 := startFFmpegProcess1(inFile, pw1)
process(pr1, pw2, w, h)
done2 := startFFmpegProcess2(outFile, pr2, w, h)
err := <-done1
if err != nil {
panic(err)
}
err = <-done2
if err != nil {
panic(err)
}
log.Println("Done")
}
func runOpenCvFaceDetectWithCamera(input, output string) {
xmlFile := "../examples/sample_data/haarcascade_frontalface_default.xml"
webcam, err := gocv.OpenVideoCapture(input)
if err != nil {
fmt.Printf("error opening video capture device: %v\n", input)
return
}
defer webcam.Close()
// prepare image matrix
img := gocv.NewMat()
defer img.Close()
if ok := webcam.Read(&img); !ok {
panic(fmt.Sprintf("Cannot read device %v", input))
}
fmt.Printf("img: %vX%v\n", img.Cols(), img.Rows())
pr1, pw1 := io.Pipe()
// writeProcess("./sample_data/face_detect.mp4", pr1, img.Cols(), img.Rows())
// writeProcess(output, pr1, img.Cols(), img.Rows())
startFFmpegProcess2(output, pr1, img.Cols(), img.Rows())
// color for the rect when faces detected
blue := color.RGBA{B: 255}
// load classifier to recognize faces
classifier := gocv.NewCascadeClassifier()
defer classifier.Close()
if !classifier.Load(xmlFile) {
fmt.Printf("Error reading cascade file: %v\n", xmlFile)
return
}
fmt.Printf("Start reading device: %v\n", input)
for i := 0; i < 2000; i++ {
if ok := webcam.Read(&img); !ok {
fmt.Printf("Device closed: %v\n", input)
return
}
if img.Empty() {
continue
}
// detect faces
rects := classifier.DetectMultiScale(img)
fmt.Printf("found %d faces\n", len(rects))
// draw a rectangle around each face on the original image, along with text identifing as "Human"
for _, r := range rects {
gocv.Rectangle(&img, r, blue, 3)
size := gocv.GetTextSize("Human", gocv.FontHersheyPlain, 1.2, 2)
pt := image.Pt(r.Min.X+(r.Min.X/2)-(size.X/2), r.Min.Y-2)
gocv.PutText(&img, "Human", pt, gocv.FontHersheyPlain, 1.2, blue, 2)
}
// pw1.Write(img.ToBytes())
//test buf to image
img1, err := gocv.NewMatFromBytes(img.Rows(), img.Cols(), gocv.MatTypeCV8UC3, img.ToBytes())
if err != nil {
fmt.Println("change fail")
}
gocv.IMWrite("test1.jpg", img)
gocv.IMWrite("test.jpg", img1)
os.Exit(1)
}
pw1.Close()
log.Println("Done")
}
func main() {
input := "rtsp://admin:cvdev2018@192.168.1.51"
output := "rtmp://127.0.0.1:1935/live/stream"
fmt.Println("test rtmp begin")
// runExampleStream(input, output)
runOpenCvFaceDetectWithCamera(input, output)
fmt.Println("test rtmp end")
}

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package ffmpeg_go
import (
"context"
"errors"
"fmt"
"strings"
"github.com/u2takey/go-utils/sets"
)
type Stream struct {
Node *Node
Label Label
Selector Selector
Type string
Context context.Context
}
type RunHook struct {
f func()
done <-chan struct{}
closer interface {
Close() error
}
}
func NewStream(node *Node, streamType string, label Label, selector Selector) *Stream {
return &Stream{
Node: node,
Label: label,
Selector: selector,
Type: streamType,
Context: context.Background(),
}
}
func (s *Stream) Hash() int {
return s.Node.Hash() + getHash(s.Label)
}
func (s *Stream) Equal(other Stream) bool {
return s.Hash() == other.Hash()
}
func (s *Stream) String() string {
return fmt.Sprintf("node: %s, label: %s, selector: %s", s.Node.String(), s.Label, s.Selector)
}
func (s *Stream) Get(index string) *Stream {
if s.Selector != "" {
panic(errors.New("stream already has a selector"))
}
return s.Node.Stream(s.Label, Selector(index))
}
func (s *Stream) Audio() *Stream {
return s.Get("a")
}
func (s *Stream) Video() *Stream {
return s.Get("v")
}
func getStreamMap(streamSpec []*Stream) map[int]*Stream {
m := map[int]*Stream{}
for i := range streamSpec {
m[i] = streamSpec[i]
}
return m
}
func getStreamMapNodes(streamMap map[int]*Stream) (ret []*Node) {
for k := range streamMap {
ret = append(ret, streamMap[k].Node)
}
return ret
}
func getStreamSpecNodes(streamSpec []*Stream) []*Node {
return getStreamMapNodes(getStreamMap(streamSpec))
}
type Node struct {
streamSpec []*Stream
name string
incomingStreamTypes sets.String
outgoingStreamType string
minInputs int
maxInputs int
args []string
kwargs KwArgs
nodeType string
}
func NewNode(streamSpec []*Stream,
name string,
incomingStreamTypes sets.String,
outgoingStreamType string,
minInputs int,
maxInputs int,
args []string,
kwargs KwArgs,
nodeType string) *Node {
n := &Node{
streamSpec: streamSpec,
name: name,
incomingStreamTypes: incomingStreamTypes,
outgoingStreamType: outgoingStreamType,
minInputs: minInputs,
maxInputs: maxInputs,
args: args,
kwargs: kwargs,
nodeType: nodeType,
}
n.__checkInputLen()
n.__checkInputTypes()
return n
}
func NewInputNode(name string, args []string, kwargs KwArgs) *Node {
return NewNode(nil,
name,
nil,
"FilterableStream",
0,
0,
args,
kwargs,
"InputNode")
}
func NewFilterNode(name string, streamSpec []*Stream, maxInput int, args []string, kwargs KwArgs) *Node {
return NewNode(streamSpec,
name,
sets.NewString("FilterableStream"),
"FilterableStream",
1,
maxInput,
args,
kwargs,
"FilterNode")
}
func NewOutputNode(name string, streamSpec []*Stream, args []string, kwargs KwArgs) *Node {
return NewNode(streamSpec,
name,
sets.NewString("FilterableStream"),
"OutputStream",
1,
-1,
args,
kwargs,
"OutputNode")
}
func NewMergeOutputsNode(name string, streamSpec []*Stream) *Node {
return NewNode(streamSpec,
name,
sets.NewString("OutputStream"),
"OutputStream",
1,
-1,
nil,
nil,
"MergeOutputsNode")
}
func NewGlobalNode(name string, streamSpec []*Stream, args []string, kwargs KwArgs) *Node {
return NewNode(streamSpec,
name,
sets.NewString("OutputStream"),
"OutputStream",
1,
1,
args,
kwargs,
"GlobalNode")
}
func (n *Node) __checkInputLen() {
streamMap := getStreamMap(n.streamSpec)
if n.minInputs >= 0 && len(streamMap) < n.minInputs {
panic(fmt.Sprintf("Expected at least %d input stream(s); got %d", n.minInputs, len(streamMap)))
}
if n.maxInputs >= 0 && len(streamMap) > n.maxInputs {
panic(fmt.Sprintf("Expected at most %d input stream(s); got %d", n.maxInputs, len(streamMap)))
}
}
func (n *Node) __checkInputTypes() {
streamMap := getStreamMap(n.streamSpec)
for _, s := range streamMap {
if !n.incomingStreamTypes.Has(s.Type) {
panic(fmt.Sprintf("Expected incoming stream(s) to be of one of the following types: %s; got %s", n.incomingStreamTypes, s.Type))
}
}
}
func (n *Node) __getIncomingEdgeMap() map[Label]NodeInfo {
incomingEdgeMap := map[Label]NodeInfo{}
streamMap := getStreamMap(n.streamSpec)
for i, s := range streamMap {
incomingEdgeMap[Label(fmt.Sprintf("%v", i))] = NodeInfo{
Node: s.Node,
Label: s.Label,
Selector: s.Selector,
}
}
return incomingEdgeMap
}
func (n *Node) Hash() int {
b := 0
for downStreamLabel, upStreamInfo := range n.IncomingEdgeMap() {
b += getHash(fmt.Sprintf("%s%d%s%s", downStreamLabel, upStreamInfo.Node.Hash(), upStreamInfo.Label, upStreamInfo.Selector))
}
b += getHash(n.args)
b += getHash(n.kwargs)
return b
}
func (n *Node) String() string {
return fmt.Sprintf("%s (%s) <%s>", n.name, getString(n.args), getString(n.kwargs))
}
func (n *Node) Equal(other DagNode) bool {
return n.Hash() == other.Hash()
}
func (n *Node) ShortRepr() string {
return n.name
}
func (n *Node) IncomingEdgeMap() map[Label]NodeInfo {
return n.__getIncomingEdgeMap()
}
func (n *Node) GetInComingEdges() []DagEdge {
return GetInComingEdges(n, n.IncomingEdgeMap())
}
func (n *Node) Stream(label Label, selector Selector) *Stream {
return NewStream(n, n.outgoingStreamType, label, selector)
}
func (n *Node) Get(a string) *Stream {
l := strings.Split(a, ":")
if len(l) == 2 {
return n.Stream(Label(l[0]), Selector(l[1]))
}
return n.Stream(Label(a), "")
}
func (n *Node) GetFilter(outgoingEdges []DagEdge) string {
if n.nodeType != "FilterNode" {
panic("call GetFilter on non-FilterNode")
}
args, kwargs, ret := n.args, n.kwargs, ""
if n.name == "split" || n.name == "asplit" {
args = []string{fmt.Sprintf("%d", len(outgoingEdges))}
}
// args = Args(args).EscapeWith("\\'=:")
for _, k := range kwargs.EscapeWith("\\'=:").SortedKeys() {
v := getString(kwargs[k])
if v != "" {
args = append(args, fmt.Sprintf("%s=%s", k, v))
} else {
args = append(args, fmt.Sprintf("%s", k))
}
}
ret = escapeChars(n.name, "\\'=:")
if len(args) > 0 {
ret += fmt.Sprintf("=%s", strings.Join(args, ":"))
}
return escapeChars(ret, "\\'[],;")
}

42
probe.go Normal file
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package ffmpeg_go
import (
"bytes"
"context"
"os/exec"
"time"
)
// Probe Run ffprobe on the specified file and return a JSON representation of the output.
func Probe(fileName string, kwargs ...KwArgs) (string, error) {
return ProbeWithTimeout(fileName, 0, MergeKwArgs(kwargs))
}
func ProbeWithTimeout(fileName string, timeOut time.Duration, kwargs KwArgs) (string, error) {
args := KwArgs{
"show_format": "",
"show_streams": "",
"of": "json",
}
return ProbeWithTimeoutExec(fileName, timeOut, MergeKwArgs([]KwArgs{args, kwargs}))
}
func ProbeWithTimeoutExec(fileName string, timeOut time.Duration, kwargs KwArgs) (string, error) {
args := ConvertKwargsToCmdLineArgs(kwargs)
args = append(args, fileName)
ctx := context.Background()
if timeOut > 0 {
var cancel func()
ctx, cancel = context.WithTimeout(context.Background(), timeOut)
defer cancel()
}
cmd := exec.CommandContext(ctx, "ffprobe", args...)
buf := bytes.NewBuffer(nil)
cmd.Stdout = buf
err := cmd.Run()
if err != nil {
return "", err
}
return string(buf.Bytes()), nil
}

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probe_test.go Normal file
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package ffmpeg_go
import (
"encoding/json"
"fmt"
"strconv"
"testing"
"github.com/stretchr/testify/assert"
)
func TestProbe(t *testing.T) {
data, err := Probe(TestInputFile1, nil)
assert.Nil(t, err)
duration, err := probeOutputDuration(data)
assert.Nil(t, err)
assert.Equal(t, fmt.Sprintf("%f", duration), "7.036000")
}
type probeFormat struct {
Duration string `json:"duration"`
}
type probeData struct {
Format probeFormat `json:"format"`
}
func probeOutputDuration(a string) (float64, error) {
pd := probeData{}
err := json.Unmarshal([]byte(a), &pd)
if err != nil {
return 0, err
}
f, err := strconv.ParseFloat(pd.Format.Duration, 64)
if err != nil {
return 0, err
}
return f, nil
}

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package ffmpeg_go
import (
"context"
"fmt"
"io"
"log"
"os"
"os/exec"
"sort"
"strings"
"time"
)
func getInputArgs(node *Node) []string {
var args []string
if node.name == "input" {
kwargs := node.kwargs.Copy()
filename := kwargs.PopString("filename")
format := kwargs.PopString("format")
videoSize := kwargs.PopString("video_size")
if format != "" {
args = append(args, "-f", format)
}
if videoSize != "" {
args = append(args, "-video_size", videoSize)
}
args = append(args, ConvertKwargsToCmdLineArgs(kwargs)...)
args = append(args, "-i", filename)
} else {
panic("unsupported node input name")
}
return args
}
func formatInputStreamName(streamNameMap map[string]string, edge DagEdge, finalArg bool) string {
prefix := streamNameMap[fmt.Sprintf("%d%s", edge.UpStreamNode.Hash(), edge.UpStreamLabel)]
suffix := ""
format := "[%s%s]"
if edge.UpStreamSelector != "" {
suffix = fmt.Sprintf(":%s", edge.UpStreamSelector)
}
if finalArg && edge.UpStreamNode.(*Node).nodeType == "InputNode" {
format = "%s%s"
}
return fmt.Sprintf(format, prefix, suffix)
}
func formatOutStreamName(streamNameMap map[string]string, edge DagEdge) string {
return fmt.Sprintf("[%s]", streamNameMap[fmt.Sprintf("%d%s", edge.UpStreamNode.Hash(), edge.UpStreamLabel)])
}
func _getFilterSpec(node *Node, outOutingEdgeMap map[Label][]NodeInfo, streamNameMap map[string]string) string {
var input, output []string
for _, e := range node.GetInComingEdges() {
input = append(input, formatInputStreamName(streamNameMap, e, false))
}
outEdges := GetOutGoingEdges(node, outOutingEdgeMap)
for _, e := range outEdges {
output = append(output, formatOutStreamName(streamNameMap, e))
}
return fmt.Sprintf("%s%s%s", strings.Join(input, ""), node.GetFilter(outEdges), strings.Join(output, ""))
}
func _getAllLabelsInSorted(m map[Label]NodeInfo) []Label {
var r []Label
for a := range m {
r = append(r, a)
}
sort.Slice(r, func(i, j int) bool {
return r[i] < r[j]
})
return r
}
func _getAllLabelsSorted(m map[Label][]NodeInfo) []Label {
var r []Label
for a := range m {
r = append(r, a)
}
sort.Slice(r, func(i, j int) bool {
return r[i] < r[j]
})
return r
}
func _allocateFilterStreamNames(nodes []*Node, outOutingEdgeMaps map[int]map[Label][]NodeInfo, streamNameMap map[string]string) {
sc := 0
for _, n := range nodes {
om := outOutingEdgeMaps[n.Hash()]
// todo sort
for _, l := range _getAllLabelsSorted(om) {
if len(om[l]) > 1 {
panic(fmt.Sprintf(`encountered %s with multiple outgoing edges
with same upstream label %s; a 'split'' filter is probably required`, n.name, l))
}
streamNameMap[fmt.Sprintf("%d%s", n.Hash(), l)] = fmt.Sprintf("s%d", sc)
sc += 1
}
}
}
func _getFilterArg(nodes []*Node, outOutingEdgeMaps map[int]map[Label][]NodeInfo, streamNameMap map[string]string) string {
_allocateFilterStreamNames(nodes, outOutingEdgeMaps, streamNameMap)
var filterSpec []string
for _, n := range nodes {
filterSpec = append(filterSpec, _getFilterSpec(n, outOutingEdgeMaps[n.Hash()], streamNameMap))
}
return strings.Join(filterSpec, ";")
}
func _getGlobalArgs(node *Node) []string {
return node.args
}
func _getOutputArgs(node *Node, streamNameMap map[string]string) []string {
if node.name != "output" {
panic("Unsupported output node")
}
var args []string
if len(node.GetInComingEdges()) == 0 {
panic("Output node has no mapped streams")
}
for _, e := range node.GetInComingEdges() {
streamName := formatInputStreamName(streamNameMap, e, true)
if streamName != "0" || len(node.GetInComingEdges()) > 1 {
args = append(args, "-map", streamName)
}
}
kwargs := node.kwargs.Copy()
filename := kwargs.PopString("filename")
if kwargs.HasKey("format") {
args = append(args, "-f", kwargs.PopString("format"))
}
if kwargs.HasKey("video_bitrate") {
args = append(args, "-b:v", kwargs.PopString("video_bitrate"))
}
if kwargs.HasKey("audio_bitrate") {
args = append(args, "-b:a", kwargs.PopString("audio_bitrate"))
}
if kwargs.HasKey("video_size") {
args = append(args, "-video_size", kwargs.PopString("video_size"))
}
args = append(args, ConvertKwargsToCmdLineArgs(kwargs)...)
args = append(args, filename)
return args
}
func (s *Stream) GetArgs() []string {
var args []string
nodes := getStreamSpecNodes([]*Stream{s})
var dagNodes []DagNode
streamNameMap := map[string]string{}
for i := range nodes {
dagNodes = append(dagNodes, nodes[i])
}
sorted, outGoingMap, err := TopSort(dagNodes)
if err != nil {
panic(err)
}
DebugNodes(sorted)
DebugOutGoingMap(sorted, outGoingMap)
var inputNodes, outputNodes, globalNodes, filterNodes []*Node
for i := range sorted {
n := sorted[i].(*Node)
switch n.nodeType {
case "InputNode":
streamNameMap[fmt.Sprintf("%d", n.Hash())] = fmt.Sprintf("%d", len(inputNodes))
inputNodes = append(inputNodes, n)
case "OutputNode":
outputNodes = append(outputNodes, n)
case "GlobalNode":
globalNodes = append(globalNodes, n)
case "FilterNode":
filterNodes = append(filterNodes, n)
}
}
// input args from inputNodes
for _, n := range inputNodes {
args = append(args, getInputArgs(n)...)
}
// filter args from filterNodes
filterArgs := _getFilterArg(filterNodes, outGoingMap, streamNameMap)
if filterArgs != "" {
args = append(args, "-filter_complex", filterArgs)
}
// output args from outputNodes
for _, n := range outputNodes {
args = append(args, _getOutputArgs(n, streamNameMap)...)
}
// global args with outputNodes
for _, n := range globalNodes {
args = append(args, _getGlobalArgs(n)...)
}
if s.Context.Value("OverWriteOutput") != nil {
args = append(args, "-y")
}
return args
}
func (s *Stream) WithTimeout(timeOut time.Duration) *Stream {
if timeOut > 0 {
s.Context, _ = context.WithTimeout(s.Context, timeOut)
}
return s
}
func (s *Stream) OverWriteOutput() *Stream {
s.Context = context.WithValue(s.Context, "OverWriteOutput", struct{}{})
return s
}
func (s *Stream) WithInput(reader io.Reader) *Stream {
s.Context = context.WithValue(s.Context, "Stdin", reader)
return s
}
func (s *Stream) WithOutput(out ...io.Writer) *Stream {
if len(out) > 0 {
s.Context = context.WithValue(s.Context, "Stdout", out[0])
}
if len(out) > 1 {
s.Context = context.WithValue(s.Context, "Stderr", out[1])
}
return s
}
func (s *Stream) WithErrorOutput(out io.Writer) *Stream {
s.Context = context.WithValue(s.Context, "Stderr", out)
return s
}
func (s *Stream) ErrorToStdOut() *Stream {
return s.WithErrorOutput(os.Stdout)
}
// for test
func (s *Stream) Compile() *exec.Cmd {
args := s.GetArgs()
cmd := exec.CommandContext(s.Context, "ffmpeg", args...)
if a, ok := s.Context.Value("Stdin").(io.Reader); ok {
cmd.Stdin = a
}
if a, ok := s.Context.Value("Stdout").(io.Writer); ok {
cmd.Stdout = a
}
if a, ok := s.Context.Value("Stderr").(io.Writer); ok {
cmd.Stderr = a
}
log.Printf("compiled command: ffmpeg %s\n", strings.Join(args, " "))
return cmd
}
func (s *Stream) Run() error {
if s.Context.Value("run_hook") != nil {
hook := s.Context.Value("run_hook").(*RunHook)
go hook.f()
defer func() {
if hook.closer != nil {
_ = hook.closer.Close()
}
<-hook.done
}()
}
return s.Compile().Run()
}

138
run_linux.go Normal file
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package ffmpeg_go
import (
"context"
"errors"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"github.com/u2takey/go-utils/rand"
)
const (
cgroupConfigKey = "cgroupConfig"
cpuRoot = "/sys/fs/cgroup/cpu,cpuacct"
cpuSetRoot = "/sys/fs/cgroup/cpuset"
procsFile = "cgroup.procs"
cpuSharesFile = "cpu.shares"
cfsPeriodUsFile = "cpu.cfs_period_us"
cfsQuotaUsFile = "cpu.cfs_quota_us"
cpuSetCpusFile = "cpuset.cpus"
cpuSetMemsFile = "cpuset.mems"
)
type cgroupConfig struct {
cpuRequest float32
cpuLimit float32
cpuset string
memset string
}
func (s *Stream) setCGroupConfig(f func(config *cgroupConfig)) *Stream {
a := s.Context.Value(cgroupConfigKey)
if a == nil {
a = &cgroupConfig{}
}
f(a.(*cgroupConfig))
s.Context = context.WithValue(s.Context, cgroupConfigKey, a)
return s
}
func (s *Stream) WithCpuCoreRequest(n float32) *Stream {
return s.setCGroupConfig(func(config *cgroupConfig) {
config.cpuRequest = n
})
}
func (s *Stream) WithCpuCoreLimit(n float32) *Stream {
return s.setCGroupConfig(func(config *cgroupConfig) {
config.cpuLimit = n
})
}
func (s *Stream) WithCpuSet(n string) *Stream {
return s.setCGroupConfig(func(config *cgroupConfig) {
config.cpuset = n
})
}
func (s *Stream) WithMemSet(n string) *Stream {
return s.setCGroupConfig(func(config *cgroupConfig) {
config.memset = n
})
}
func writeCGroupFile(rootPath, file string, value string) error {
return ioutil.WriteFile(filepath.Join(rootPath, file), []byte(value), 0755)
}
func (s *Stream) RunLinux() error {
a := s.Context.Value(cgroupConfigKey).(*cgroupConfig)
if a.cpuRequest > a.cpuLimit {
return errors.New("cpuCoreLimit should greater or equal to cpuCoreRequest")
}
name := "ffmpeg_go_" + rand.String(6)
rootCpuPath, rootCpuSetPath := filepath.Join(cpuRoot, name), filepath.Join(cpuSetRoot, name)
err := os.MkdirAll(rootCpuPath, 0777)
if err != nil {
return err
}
err = os.MkdirAll(rootCpuSetPath, 0777)
if err != nil {
return err
}
defer func() { _ = os.Remove(rootCpuPath); _ = os.Remove(rootCpuSetPath) }()
share := int(1024 * a.cpuRequest)
period := 100000
quota := int(a.cpuLimit * 100000)
if share > 0 {
err = writeCGroupFile(rootCpuPath, cpuSharesFile, strconv.Itoa(share))
if err != nil {
return err
}
}
err = writeCGroupFile(rootCpuPath, cfsPeriodUsFile, strconv.Itoa(period))
if err != nil {
return err
}
if quota > 0 {
err = writeCGroupFile(rootCpuPath, cfsQuotaUsFile, strconv.Itoa(quota))
if err != nil {
return err
}
}
if a.cpuset != "" && a.memset != "" {
err = writeCGroupFile(rootCpuSetPath, cpuSetCpusFile, a.cpuset)
if err != nil {
return err
}
err = writeCGroupFile(rootCpuSetPath, cpuSetMemsFile, a.memset)
if err != nil {
return err
}
}
cmd := s.Compile()
err = cmd.Start()
if err != nil {
return err
}
if share > 0 || quota > 0 {
err = writeCGroupFile(rootCpuPath, procsFile, strconv.Itoa(cmd.Process.Pid))
if err != nil {
return err
}
}
if a.cpuset != "" && a.memset != "" {
err = writeCGroupFile(rootCpuSetPath, procsFile, strconv.Itoa(cmd.Process.Pid))
if err != nil {
return err
}
}
return cmd.Wait()
}

222
utils.go Normal file
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package ffmpeg_go
import (
"fmt"
"hash/fnv"
"sort"
"strconv"
"strings"
"github.com/u2takey/go-utils/sets"
)
func getString(item interface{}) string {
if a, ok := item.(interface{ String() string }); ok {
return a.String()
}
switch a := item.(type) {
case string:
return a
case []string:
return strings.Join(a, ", ")
case Args:
return strings.Join(a, ", ")
case []interface{}:
var r []string
for _, b := range a {
r = append(r, getString(b))
}
return strings.Join(r, ", ")
case KwArgs:
var keys, r []string
for k := range a {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
r = append(r, fmt.Sprintf("%s: %s", k, getString(a[k])))
}
return fmt.Sprintf("{%s}", strings.Join(r, ", "))
case map[string]interface{}:
var keys, r []string
for k := range a {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
r = append(r, fmt.Sprintf("%s: %s", k, getString(a[k])))
}
return fmt.Sprintf("{%s}", strings.Join(r, ", "))
}
return fmt.Sprintf("%v", item)
}
func getHash(item interface{}) int {
h := fnv.New64()
switch a := item.(type) {
case interface{ Hash() int }:
return a.Hash()
case string:
_, _ = h.Write([]byte(a))
return int(h.Sum64())
case []byte:
_, _ = h.Write(a)
return int(h.Sum64())
case map[string]interface{}:
b := 0
for k, v := range a {
b += getHash(k) + getHash(v)
}
return b
case KwArgs:
b := 0
for k, v := range a {
b += getHash(k) + getHash(v)
}
return b
default:
_, _ = h.Write([]byte(getString(item)))
return int(h.Sum64())
}
}
func escapeChars(text, chars string) string {
s := sets.NewString()
for _, a := range chars {
s.Insert(string(a))
}
sl := s.List()
if s.Has("\\") {
s.Delete("\\")
sl = append([]string{"\\"}, s.List()...)
}
for _, ch := range sl {
text = strings.ReplaceAll(text, ch, "\\"+ch)
}
return text
}
type Args []string
func (a Args) Sorted() Args {
sort.Strings(a)
return a
}
func (a Args) EscapeWith(chars string) Args {
out := Args{}
for _, b := range a {
out = append(out, escapeChars(b, chars))
}
return out
}
type KwArgs map[string]interface{}
func MergeKwArgs(args []KwArgs) KwArgs {
a := KwArgs{}
for _, b := range args {
for c := range b {
a[c] = b[c]
}
}
return a
}
func (a KwArgs) EscapeWith(chars string) KwArgs {
out := KwArgs{}
for k, v := range a {
out[escapeChars(k, chars)] = escapeChars(getString(v), chars)
}
return out
}
func (a KwArgs) Copy() KwArgs {
r := KwArgs{}
for k := range a {
r[k] = a[k]
}
return r
}
func (a KwArgs) SortedKeys() []string {
var r []string
for k := range a {
r = append(r, k)
}
sort.Strings(r)
return r
}
func (a KwArgs) GetString(k string) string {
if v, ok := a[k]; ok {
return fmt.Sprintf("%v", v)
}
return ""
}
func (a KwArgs) PopString(k string) string {
if c, ok := a[k]; ok {
defer delete(a, k)
return fmt.Sprintf("%v", c)
}
return ""
}
func (a KwArgs) HasKey(k string) bool {
_, ok := a[k]
return ok
}
func (a KwArgs) GetDefault(k string, defaultV interface{}) interface{} {
if v, ok := a[k]; ok {
return v
}
return defaultV
}
func (a KwArgs) PopDefault(k string, defaultV interface{}) interface{} {
if v, ok := a[k]; ok {
defer delete(a, k)
return v
}
return defaultV
}
func ConvertKwargsToCmdLineArgs(kwargs KwArgs) []string {
var keys, args []string
for k := range kwargs {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
v := kwargs[k]
switch a := v.(type) {
case string:
args = append(args, fmt.Sprintf("-%s", k))
if a != "" {
args = append(args, a)
}
case []string:
for _, r := range a {
args = append(args, fmt.Sprintf("-%s", k))
if r != "" {
args = append(args, r)
}
}
case []int:
for _, r := range a {
args = append(args, fmt.Sprintf("-%s", k))
args = append(args, strconv.Itoa(r))
}
case int:
args = append(args, fmt.Sprintf("-%s", k))
args = append(args, strconv.Itoa(a))
default:
args = append(args, fmt.Sprintf("-%s", k))
args = append(args, fmt.Sprintf("%v", a))
}
}
return args
}

98
view.go Normal file
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package ffmpeg_go
import (
"bytes"
"fmt"
)
type ViewType string
const (
// FlowChart the diagram type for output in flowchart style (https://mermaid-js.github.io/mermaid/#/flowchart) (including current state
ViewTypeFlowChart ViewType = "flowChart"
// StateDiagram the diagram type for output in stateDiagram style (https://mermaid-js.github.io/mermaid/#/stateDiagram)
ViewTypeStateDiagram ViewType = "stateDiagram"
)
func (s *Stream) View(viewType ViewType) (string, error) {
switch viewType {
case ViewTypeFlowChart:
return visualizeForMermaidAsFlowChart(s)
case ViewTypeStateDiagram:
return visualizeForMermaidAsStateDiagram(s)
default:
return "", fmt.Errorf("unknown ViewType: %s", viewType)
}
}
func visualizeForMermaidAsStateDiagram(s *Stream) (string, error) {
var buf bytes.Buffer
nodes := getStreamSpecNodes([]*Stream{s})
var dagNodes []DagNode
for i := range nodes {
dagNodes = append(dagNodes, nodes[i])
}
sorted, outGoingMap, err := TopSort(dagNodes)
if err != nil {
return "", err
}
buf.WriteString("stateDiagram\n")
for _, node := range sorted {
next := outGoingMap[node.Hash()]
for k, v := range next {
for _, nextNode := range v {
label := string(k)
if label == "" {
label = "<>"
}
buf.WriteString(fmt.Sprintf(` %s --> %s: %s`, node.ShortRepr(), nextNode.Node.ShortRepr(), label))
buf.WriteString("\n")
}
}
}
return buf.String(), nil
}
// visualizeForMermaidAsFlowChart outputs a visualization of a FSM in Mermaid format (including highlighting of current state).
func visualizeForMermaidAsFlowChart(s *Stream) (string, error) {
var buf bytes.Buffer
nodes := getStreamSpecNodes([]*Stream{s})
var dagNodes []DagNode
for i := range nodes {
dagNodes = append(dagNodes, nodes[i])
}
sorted, outGoingMap, err := TopSort(dagNodes)
if err != nil {
return "", err
}
buf.WriteString("graph LR\n")
for _, node := range sorted {
buf.WriteString(fmt.Sprintf(` %d[%s]`, node.Hash(), node.ShortRepr()))
buf.WriteString("\n")
}
buf.WriteString("\n")
for _, node := range sorted {
next := outGoingMap[node.Hash()]
for k, v := range next {
for _, nextNode := range v {
// todo ignore merged output
label := string(k)
if label == "" {
label = "<>"
}
buf.WriteString(fmt.Sprintf(` %d --> |%s| %d`, node.Hash(), fmt.Sprintf("%s:%s", nextNode.Label, label), nextNode.Node.Hash()))
buf.WriteString("\n")
}
}
}
buf.WriteString("\n")
return buf.String(), nil
}