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我打开视频文件并将其逐帧复制到另一个文件，如下所示：

def copy1(in_file, out_file):
    capt = cv.CaptureFromFile(in_file)
    frames_num = int(cv.GetCaptureProperty(capt, cv.CV_CAP_PROP_FRAME_COUNT))
    fps = int(cv.GetCaptureProperty(capt, cv.CV_CAP_PROP_FPS))
    frame_width = int(cv.GetCaptureProperty(capt, cv.CV_CAP_PROP_FRAME_WIDTH))
    frame_height = int(cv.GetCaptureProperty(capt, cv.CV_CAP_PROP_FRAME_HEIGHT))
    vwriter = cv.CreateVideoWriter(out_file, cv.CV_FOURCC('P', 'I', 'M', '1'), fps, (frame_width, frame_height), True)
    for i in range(0, frames_num):
        frame = cv.QueryFrame(capt)
        if frame:
            cv.WriteFrame(vwriter, frame)
        else:
            pass
    print 'Processed', i, 'frames'

但是，当我播放 时out_file，它比原来的要快。 通过将其转换为切断声音来in_file创建形式。显示和之间的唯一区别是比特率（大约高出 1倍）。这意味着什么？ogvmpeg1videoffprobein_fileout_file6out_file

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