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