利用Golang和FFmpeg实现视频分段编码的技巧

??Golang?FFmpeg?????????????????????:

1. ??FFmpeg:??,????FFmpeg?????????????????FFmpeg???????????????

2. ??Golang????:?Golang?????????,??os/exec????FFmpeg???

3. ??FFmpeg??????:??os/exec??Golang???FFmpeg?????,????????????????H.264??:

cmd := exec.Command("ffmpeg", "-i", "input.mp4", "-c:v", "libx264", "-preset", "fast", "-crf", "22", "-ss", "00:00:00", "-t", "00:00:10", "output1.mp4")
err := cmd.Run()
if err != nil {
log.Fatal(err)
}

?????????input.mp4?????output1.mp4,?00:00:00??,??10????????????,???????????????????

4. ????????:????,???????????????????,?????????????????:

segmentDuration := 10 // ????,???
totalDuration := 60 // ???,???
outputPrefix := "output" // ??????
for i := 0; i < totalDuration/segmentDuration; i++ {
startTime := i * segmentDuration
outputFilename := fmt.Sprintf("%s%d.mp4", outputPrefix, i+1)
cmd := exec.Command("ffmpeg", "-i", "input.mp4", "-c:v", "libx264", "-preset", "fast", "-crf", "22", "-ss", fmt.Sprintf("00:00:d", startTime), "-t", fmt.Sprintf("00:00:d", segmentDuration), outputFilename)
err := cmd.Run()
if err != nil {
log.Fatal(err)
}
}

?????????input.mp4?????output1.mp4?output2.mp4?,???????10?,????60??

???,?????????????????,????????????????????????????,???????????????????