% mpv av://v4l2:/dev/video0
Playing: av://v4l2:/dev/video0
[ffmpeg/demuxer] video4linux2,v4l2: ioctl(VIDIOC_G_PARM): Invalid argument
[ffmpeg/demuxer] video4linux2,v4l2: Time per frame unknown
 (+) Video --vid=1 (rawvideo 640x480)
[vo/xv] Warning: this legacy VO has bad quality and performance, and will in particular result in blurry OSD and subtitles. You should fix your graphics drivers, or not force the xv VO.
[autoconvert] Converting yuyv422 -> uyvy422
VO: [xv] 640x480 uyvy422
video0
V: 00:00:00 / 00:00:01 (20%)
[ffmpeg/demuxer] video4linux2,v4l2: Some buffers are still owned by the caller on close.
[ffmpeg] ioctl(VIDIOC_QBUF): Bad file descriptor
[ffmpeg] ioctl(VIDIOC_QBUF): Bad file descriptor
[ffmpeg] ioctl(VIDIOC_QBUF): Bad file descriptor
[ffmpeg] ioctl(VIDIOC_QBUF): Bad file descriptor
[ffmpeg] ioctl(VIDIOC_QBUF): Bad file descriptor
[ffmpeg] ioctl(VIDIOC_QBUF): Bad file descriptor