diff --git a/examples/go.mod b/examples/go.mod
new file mode 100644
index 0000000..7ce3ade
--- /dev/null
+++ b/examples/go.mod
@@ -0,0 +1,7 @@
+module github.com/u2takey/ffmpeg-go/examples
+
+go 1.14
+
+replace github.com/u2takey/ffmpeg-go => ../../ffmpeg-go
+
+require github.com/u2takey/ffmpeg-go v0.0.0-00010101000000-000000000000
diff --git a/examples/go.sum b/examples/go.sum
new file mode 100644
index 0000000..fdd0fa1
--- /dev/null
+++ b/examples/go.sum
@@ -0,0 +1,44 @@
+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/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/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/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/tidwall/gjson v1.6.3 h1:aHoiiem0dr7GHkW001T1SMTJ7X5PvyekH5WX0whWGnI=
+github.com/tidwall/gjson v1.6.3/go.mod h1:BaHyNc5bjzYkPqgLq7mdVzeiRtULKULXLgZFKsxEHI0=
+github.com/tidwall/match v1.0.1 h1:PnKP62LPNxHKTwvHHZZzdOAOCtsJTjo6dZLCwpKm5xc=
+github.com/tidwall/match v1.0.1/go.mod h1:LujAq0jyVjBy028G1WhWfIzbpQfMO8bBZ6Tyb0+pL9E=
+github.com/tidwall/pretty v1.0.2 h1:Z7S3cePv9Jwm1KwS0513MRaoUe3S01WPbLNV40pwWZU=
+github.com/tidwall/pretty v1.0.2/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
+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=
+golang.org/x/sys v0.0.0-20191115151921-52ab43148777/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/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=
diff --git a/examples/in1.mp4 b/examples/in1.mp4
new file mode 100644
index 0000000..2c7d59e
Binary files /dev/null and b/examples/in1.mp4 differ
diff --git a/examples/stream.go b/examples/stream.go
new file mode 100644
index 0000000..755ae7e
--- /dev/null
+++ b/examples/stream.go
@@ -0,0 +1,155 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"sync"
+
+	ffmpeg "github.com/u2takey/ffmpeg-go"
+)
+
+var (
+	InputFile  = flag.String("in_filename", "./in1.mp4", "Input filename")
+	OutputFile = flag.String("out_filename", "./out.mp4", "Input filename")
+	Dream      = flag.Bool("dream", false, "Use DeepDream frame processing (requires tensorflow)")
+)
+
+// Buffer is a goroutine safe bytes.Buffer
+type Buffer struct {
+	buffer bytes.Buffer
+	mutex  sync.Mutex
+}
+
+func (s *Buffer) Write(p []byte) (n int, err error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	return s.buffer.Write(p)
+}
+
+func (s *Buffer) Read(p []byte) (n int, err error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	return s.buffer.Read(p)
+}
+
+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 run(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 main() {
+	flag.Parse()
+	if *Dream == true {
+		fmt.Println("tensorflow mode not implemented, todo")
+		return
+	}
+	run(*InputFile, *OutputFile)
+}
diff --git a/probe.go b/probe.go
index 578bfa0..855c882 100644
--- a/probe.go
+++ b/probe.go
@@ -15,8 +15,8 @@ import (
 //            The stderr output can be retrieved by accessing the
 //            ``stderr`` property of the exception.
 
-func Probe(fileName string, kwargs KwArgs) (string, error) {
-	return ProbeWithTimeout(fileName, 0, kwargs)
+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) {