output to mp4

[cedricve]

do we have an example to encode the file to a mp4 container? For example using ffmpeg.

[aamaanaa]

func recordWebCam(savepath string) (err error) {

	const (
		recordSeconds = 20
		intervalMs    = 40 // approx 25 FPS (1000 / 25 = 40)
	)

	cam, err := webcam.Open("/dev/video0")
	if err != nil {
		return err
	}
	defer cam.Close()

	if err = cam.StartStreaming(); err != nil {
		return err
	}

	// convert:
	// ffmpeg -f mjpeg -i output.webcam -c:v libx264 output.mp4
	outFile, err := os.Create(filepath.Join(savepath, "output.webcam"))
	if err != nil {
		return err
	}
	defer outFile.Close()

	ticker := time.NewTicker(time.Millisecond * intervalMs)
	defer ticker.Stop()

	timeout := uint32(intervalMs)
	done := time.After(time.Second * time.Duration(recordSeconds))

	for {
		select {
		case <-done:
			return nil
		case <-ticker.C:
			err = cam.WaitForFrame(timeout)
			switch err.(type) {
			case nil:
			case *webcam.Timeout:
				continue
			default:
				return err
			}

			frame, err := cam.ReadFrame()
			if err != nil {
				return err
			}

			if len(frame) != 0 {
				_, err := outFile.Write(frame)
				if err != nil {
					continue // skip bad write but keep recording
				}
			}
		}
	}
}

This is what i came up with