[FFmpeg-trac] #2007(avformat:new): buffer underflow flood while remuxing mpeg stream

[FFmpeg]

#2007: buffer underflow flood while remuxing mpeg stream
--------------------------------------+----------------------------------
               Reporter:  ubitux      |                  Owner:
                   Type:  defect      |                 Status:  new
               Priority:  minor       |              Component:  avformat
                Version:  git-master  |               Keywords:  mpeg
             Blocked By:              |               Blocking:
Reproduced by developer:  0           |  Analyzed by developer:  0
--------------------------------------+----------------------------------
 {{{
 % ./ffmpeg -f lavfi -i testsrc=d=300 -y test.mpg
 ffmpeg version N-47665-g18eb319 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Dec  9 2012 18:50:45 with gcc 4.7.2 (GCC)
   configuration: --enable-gpl --enable-fontconfig --enable-libfreetype
 --enable-libmp3lame --enable-libvorbis --enable-libxvid --enable-libx264
 --enable-libvpx --enable-libtheora --enable-x11grab --enable-libopenjpeg
 --enable-libass --enable-libmodplug --enable-libv4l2 --cc=colorgcc
 --samples=/home/ubitux/fate-samples --prefix=/tmp/ffinstall --enable-
 runtime-cpudetect --enable-libcelt
   libavutil      52. 12.100 / 52. 12.100
   libavcodec     54. 79.101 / 54. 79.101
   libavformat    54. 48.100 / 54. 48.100
   libavdevice    54.  3.102 / 54.  3.102
   libavfilter     3. 26.101 /  3. 26.101
   libswscale      2.  1.103 /  2.  1.103
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
 [lavfi @ 0x2aa0260] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, lavfi, from 'testsrc=d=300':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240
 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
 [mpeg @ 0x2aa1a80] VBV buffer size not set, muxing may fail
 Output #0, mpeg, to 'test.mpg':
   Metadata:
     encoder         : Lavf54.48.100
     Stream #0:0: Video: mpeg1video, yuv420p, 320x240 [SAR 1:1 DAR 4:3],
 q=2-31, 200 kb/s, 90k tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo -> mpeg1video)
 Press [q] to stop, [?] for help
 frame= 7500 fps=987 q=8.6 Lsize=    7690kB time=00:04:59.96 bitrate=
 210.0kbits/s
 video:7622kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 0.886493%
 }}}

 {{{
 % ./ffmpeg -i test.mpg -c copy -y remux.mpg
 ffmpeg version N-47665-g18eb319 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Dec  9 2012 18:50:45 with gcc 4.7.2 (GCC)
   configuration: --enable-gpl --enable-fontconfig --enable-libfreetype
 --enable-libmp3lame --enable-libvorbis --enable-libxvid --enable-libx264
 --enable-libvpx --enable-libtheora --enable-x11grab --enable-libopenjpeg
 --enable-libass --enable-libmodplug --enable-libv4l2 --cc=colorgcc
 --samples=/home/ubitux/fate-samples --prefix=/tmp/ffinstall --enable-
 runtime-cpudetect --enable-libcelt
   libavutil      52. 12.100 / 52. 12.100
   libavcodec     54. 79.101 / 54. 79.101
   libavformat    54. 48.100 / 54. 48.100
   libavdevice    54.  3.102 / 54.  3.102
   libavfilter     3. 26.101 /  3. 26.101
   libswscale      2.  1.103 /  2.  1.103
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
 [mpeg @ 0x3044240] max_analyze_duration 5000000 reached at 5000000
 Input #0, mpeg, from 'test.mpg':
   Duration: 00:00:59.76, start: 1.000000, bitrate: 244 kb/s
     Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p, 320x240 [SAR 1:1 DAR
 4:3], 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
 Output #0, mpeg, to 'remux.mpg':
   Metadata:
     encoder         : Lavf54.48.100
     Stream #0:0: Video: mpeg1video, yuv420p, 320x240 [SAR 1:1 DAR 4:3],
 q=2-31, 104857 kb/s, 25 fps, 90k tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10490 size=10833
 [mpeg @ 0x304b0a0] packet too large, ignoring buffer limits to mux it
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10490 size=10833
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10640 size=10662
 [mpeg @ 0x304b0a0] packet too large, ignoring buffer limits to mux it
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10640 size=10662
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10356 size=10841
 [mpeg @ 0x304b0a0] packet too large, ignoring buffer limits to mux it
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10356 size=10841
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10882 size=11225
 [mpeg @ 0x304b0a0] packet too large, ignoring buffer limits to mux it
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10882 size=11225
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10872 size=11165
 [mpeg @ 0x304b0a0] packet too large, ignoring buffer limits to mux it
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10872 size=11165
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10408 size=11000
 [mpeg @ 0x304b0a0] packet too large, ignoring buffer limits to mux it
 [mpeg @ 0x304b0a0] buffer underflow i=0 bufi=10408 size=11000
 frame= 1500 fps=0.0 q=-1.0 Lsize=    1784kB time=00:00:59.96 bitrate=
 243.7kbits/s
 video:1768kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 0.877842%
 }}}

 The file is playable so I believe the problem is minor. Still this flood
 should not happen, especially when the input is created with ffmpeg.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2007>
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