[FFmpeg-trac] #2910(undetermined:new): Skipping ‘nokey‘ frames in h264 video causes errors

FFmpeg trac at avcodec.org
Wed Aug 28 11:43:23 CEST 2013 

#2910: Skipping ‘nokey‘ frames in h264 video causes errors
-------------------------------------+-------------------------------------
             Reporter:  eelco        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Skipping everything but keyframes in a h264 video stream causes errors
 (which will be concealed).

 {{{
 % ffmpeg -skip_frame nokey -i
 ~/Downloads/933f2c3eb7ede98963278c8a573c331ff3284490.mkv  -vsync 0 -vf
 select='eq(pict_type\,I)' '%09d.bmp'
 ffmpeg version N-55807-g70106e7 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Aug 28 2013 10:57:51 with llvm-gcc 4.2.1 (LLVM build
 2336.11.00)
   configuration: --prefix=/Users/eelco/Projects/Beamer/FFmpeg/build
 --enable-shared --disable-static --disable-ffserver --disable-doc
 --enable-gpl --enable-version3 --enable-libx264 --enable-libtheora
 --enable-libvorbis --extra-cflags='-DMACOSX_DEPLOYMENT_TARGET=10.6
 -isysroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk
 -mmacosx-version-min=10.6
 -I/Users/eelco/Projects/Beamer/FFmpeg/build/include' --extra-
 ldflags='-isysroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk
 -mmacosx-version-min=10.6 -L/Users/eelco/Projects/Beamer/FFmpeg/build/lib'
   libavutil      52. 42.100 / 52. 42.100
   libavcodec     55. 29.100 / 55. 29.100
   libavformat    55. 14.102 / 55. 14.102
   libavdevice    55.  3.100 / 55.  3.100
   libavfilter     3. 82.102 /  3. 82.102
   libswscale      2.  5.100 /  2.  5.100
   libswresample   0. 17.103 /  0. 17.103
   libpostproc    52.  3.100 / 52.  3.100
 [h264 @ 0x101822000] Cannot use next picture in error concealment
 [h264 @ 0x101822000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x101822000] Cannot use next picture in error concealment
 [h264 @ 0x101822000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x101822000] Cannot use next picture in error concealment
 [h264 @ 0x101822000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x101822000] Cannot use next picture in error concealment
 [h264 @ 0x101822000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x101822000] Cannot use next picture in error concealment
 [h264 @ 0x101822000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x101822000] Cannot use next picture in error concealment
 [h264 @ 0x101822000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x101822000] Cannot use next picture in error concealment
 [h264 @ 0x101822000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 Input #0, matroska,webm, from
 '/Users/eelco/Downloads/933f2c3eb7ede98963278c8a573c331ff3284490.mkv':
   Metadata:
     ENCODER         : Lavf54.63.104
   Duration: 00:00:10.34, start: 0.000000, bitrate: 7450 kb/s
     Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x1080 [SAR 1:1 DAR
 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 2k tbc (default)
     Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
 (default)
     Stream #0:2(eng): Subtitle: subrip (default)
 Output #0, image2, to '%09d.bmp':
   Metadata:
     encoder         : Lavf55.14.102
     Stream #0:0(eng): Video: bmp, bgr24, 1920x1080 [SAR 1:1 DAR 16:9],
 q=2-31, 200 kb/s, 90k tbn, 23.98 tbc (default)
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 -> bmp)
 Press [q] to stop, [?] for help
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380c400] Cannot use next picture in error concealment
 [h264 @ 0x10380c400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380d000] Cannot use next picture in error concealment
 [h264 @ 0x10380d000] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380be00] Cannot use next picture in error concealment
 [h264 @ 0x10380be00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [h264 @ 0x10380ca00] Cannot use next picture in error concealment
 [h264 @ 0x10380ca00] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 [matroska,webm @ 0x101819a00] Invalid EBML number size tag 0x0a at pos
 9630173 (0x92f1dd)
 [h264 @ 0x103800400] Cannot use next picture in error concealment
 [h264 @ 0x103800400] concealing 8160 DC, 8160 AC, 8160 MV errors in P
 frame
 frame=   16 fps= 13 q=-1.0 Lsize=N/A time=00:00:07.13 bitrate=N/A
 video:97201kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 -100.000022%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2910>
FFmpeg <http://ffmpeg.org>
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