USEC_PER_SEC       38 libavcodec/v4l2_buffers.c static AVRational v4l2_timebase = { 1, USEC_PER_SEC };
USEC_PER_SEC       70 libavcodec/v4l2_buffers.c     out->buf.timestamp.tv_usec = v4l2_pts % USEC_PER_SEC;
USEC_PER_SEC       71 libavcodec/v4l2_buffers.c     out->buf.timestamp.tv_sec = v4l2_pts / USEC_PER_SEC;
USEC_PER_SEC       79 libavcodec/v4l2_buffers.c     v4l2_pts = (int64_t)avbuf->buf.timestamp.tv_sec * USEC_PER_SEC +