ffmpeg-go
ffmpeg-go is golang port of https://github.com/kkroening/ffmpeg-python
check ffmpeg_test.go for examples.
Examples
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()Task Frame From Video
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 :
Show Ffmpeg Progress
see complete example at: showProgress
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
progress: .0
progress: 0.72
progress: 1.00
progress: doneUse Ffmpeg-go With Open-cv (gocv) For Face-detect
see complete example at: opencv
result: 
Set cpu limit/request for ffmpeg-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.
> 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 ffmpegView Graph
function view generate mermaid chart, which can be use in markdown or view online
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)
