Why WriteFrame can't work on ubuntu, but it can work well on mac?

[yummybian]

var buf []image.Image
// the codec is h264
cap := opencv.NewFileCapture("video.avi")
if cap == nil {
	panic("can not open video")
}
for {
		ipli := cap.QueryFrame()
		if ipli == nil {
			break
		}
		i := ipli.ToImage()
		buf = append(buf, i)
}

props := videoProps{
	fps:    cap.GetProperty(opencv.CV_CAP_PROP_FPS),
	fourcc: cap.GetProperty(opencv.CV_CAP_PROP_FOURCC),
	width:  cap.GetProperty(opencv.CV_CAP_PROP_FRAME_WIDTH),
	height: cap.GetProperty(opencv.CV_CAP_PROP_FRAME_HEIGHT),
}
// fourcc is always 0 on mac, but it works well
w := opencv.NewVideoWriter(v.destFile, int(props.fourcc), float32(props.fps), int(props.width), int(props.height), 1)
for _, img := range buf {
	w.WriteFrame(opencv.FromImage(image))
}
cap.Release()
w.Release() 

On my mac, the above code can write video correctly, but it can just output a corrupt file when it runs on ubuntu. The corrupt file is very small, and can't be opened.

[yummybian]

@lazywei Could you give me a little hint? Tks.