demo save

examples/readFrameAsJpeg.go

@@ -0,0 +1,23 @@
+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
+}