[FFmpeg-trac] #4988(undetermined:new): Dequeued v4l2 buffer contains corrupted data (0 bytes).

[FFmpeg]

#4988: Dequeued v4l2 buffer contains corrupted data (0 bytes).
-------------------------------------+-------------------------------------
             Reporter:  neik         |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:

 Capture from Magewell xi100dusb-hdmi
 {{{
 $ ffmpeg -y -report -ts mono2abs -thread_queue_size 512 -video_size
 1280x720 -framerate 60 -i /dev/video0 -pix_fmt yuv420p out.mkv
 ffmpeg started on 2015-11-04 at 11:36:36
 Report written to "ffmpeg-20151104-113636.log"
 ffmpeg version N-76448-g9ae73d0 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 5.1.1 (GCC) 20150618 (Red Hat 5.1.1-4)
   configuration:
   libavutil      55.  5.100 / 55.  5.100
   libavcodec     57. 13.102 / 57. 13.102
   libavformat    57. 13.100 / 57. 13.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6. 14.101 /  6. 14.101
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.100 /  2.  0.100
 [video4linux2,v4l2 @ 0x3113140] Dequeued v4l2 buffer contains corrupted
 data (0 bytes).
 [video4linux2,v4l2 @ 0x3113140] Detected monotonic timestamps, converting
 Input #0, video4linux2,v4l2, from '/dev/video0':
   Duration: N/A, start: 1446636130.558504, bitrate: 884736 kb/s
     Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720,
 884736 kb/s, 60 fps, 60 tbr, 1000k tbn, 1000k tbc
 Output #0, matroska, to 'out.mkv':
   Metadata:
     encoder         : Lavf57.13.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1280x720,
 q=2-31, 200 kb/s, 60 fps, 1k tbn, 60 tbc
     Metadata:
       encoder         : Lavc57.13.102 mpeg4
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
 Press [q] to stop, [?] for help
 [video4linux2,v4l2 @ 0x3113140] Dequeued v4l2 buffer contains corrupted
 data (0 bytes).
     Last message repeated 30 times
 frame=  975 fps= 60 q=2.0 Lsize=    1223kB time=00:14:42.63 bitrate=
 11.4kbits/s
 video:1213kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.850584%
 }}}
 Adding audio causes the framerate to drop to <1fps
 {{{
 $ ffmpeg -y -report -ts mono2abs -thread_queue_size 512 -video_size
 1280x720 -framerate 60 -i /dev/video0 -thread_queue_size 512 -ac 2
 -channel_layout stereo -f alsa -i hw:1 -pix_fmt yuv420p out.mkv
 ffmpeg started on 2015-11-04 at 11:40:34
 Report written to "ffmpeg-20151104-114034.log"
 ffmpeg version N-76448-g9ae73d0 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 5.1.1 (GCC) 20150618 (Red Hat 5.1.1-4)
   configuration:
   libavutil      55.  5.100 / 55.  5.100
   libavcodec     57. 13.102 / 57. 13.102
   libavformat    57. 13.100 / 57. 13.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6. 14.101 /  6. 14.101
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.100 /  2.  0.100
 [video4linux2,v4l2 @ 0x2337320] Dequeued v4l2 buffer contains corrupted
 data (0 bytes).
 [video4linux2,v4l2 @ 0x2337320] Detected monotonic timestamps, converting
 Input #0, video4linux2,v4l2, from '/dev/video0':
   Duration: N/A, start: 1446636130.558504, bitrate: 884736 kb/s
     Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720,
 884736 kb/s, 60 fps, 60 tbr, 1000k tbn, 1000k tbc
 Input #1, alsa, from 'hw:1':
   Duration: N/A, start: 1446637235.116087, bitrate: 1536 kb/s
     Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
 Output #0, matroska, to 'out.mkv':
   Metadata:
     encoder         : Lavf57.13.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1280x720,
 q=2-31, 200 kb/s, 60 fps, 1k tbn, 60 tbc
     Metadata:
       encoder         : Lavc57.13.102 mpeg4
     Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp,
 192 kb/s
     Metadata:
       encoder         : Lavc57.13.102 ac3
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
   Stream #1:0 -> #0:1 (pcm_s16le (native) -> ac3 (native))
 Press [q] to stop, [?] for help
 [video4linux2,v4l2 @ 0x2337320] Dequeued v4l2 buffer contains corrupted
 data (0 bytes).
     Last message repeated 30 times
 [matroska @ 0x234d0a0] Starting new cluster due to timestampitrate=
 1.2kbits/s
 frame=    1 fps=0.1 q=1.6 Lsize=     179kB time=00:18:24.60 bitrate=
 1.3kbits/s
 video:10kB audio:166kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 1.412143%

 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4988>
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