1V4L2_BUF_FLAG_MAPPED 2V4L2_BUF_FLAG_QUEUED 3V4L2_BUF_FLAG_DONE 4V4L2_BUF_FLAG_KEYFRAME 5V4L2_BUF_FLAG_PFRAME 6V4L2_BUF_FLAG_BFRAME 7V4L2_BUF_FLAG_TIMECODE 8V4L2_BUF_FLAG_INPUT 9