[FFmpeg-trac] #4596(avcodec:open): Blocks when decoding H.264 containing reference B-Frames encoded by Elemental

[FFmpeg]

#4596: Blocks when decoding H.264 containing reference B-Frames encoded by
Elemental
-------------------------------------+-------------------------------------
             Reporter:  dprestegard  |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  h264         |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:  h264 => h264 regression
 * priority:  normal => important
 * version:  unspecified => git-master
 * status:  new => open
 * reproduced:  0 => 1


Comment:

 For future tickets: Please always provide a sample command that allows to
 reproduce the issue together with the complete, uncut console output.

 Only reproducible on x86-32 and x86-64, not reproducible with {{{-cpuflags
 -ssse3}}}, regression since c12d6955
 {{{
 $ ffmpeg -i test_bref-short.mp4 -qscale 2 out.avi
 ffmpeg version N-72694-g272f87f Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      54. 27.100 / 54. 27.100
   libavcodec     56. 41.101 / 56. 41.101
   libavformat    56. 34.100 / 56. 34.100
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 16.101 /  5. 16.101
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.100 /  1.  2.100
   libpostproc    53.  3.100 / 53.  3.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_bref-short.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf56.32.100
   Duration: 00:00:10.03, start: 0.023000, bitrate: 1977 kb/s
     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
 1280x720 [SAR 1:1 DAR 16:9], 1972 kb/s, 59.94 fps, 59.94 tbr, 60k tbn,
 119.88 tbc (default)
     Metadata:
       handler_name    : VideoHandler
 Please use -q:a or -q:v, -qscale is ambiguous
 Output #0, avi, to 'out.avi':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     ISFT            : Lavf56.34.100
     Stream #0:0(und): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1280x720
 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 59.94 fps, 59.94 tbn, 59.94 tbc
 (default)
     Metadata:
       handler_name    : VideoHandler
       encoder         : Lavc56.41.101 mpeg4
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
 Press [q] to stop, [?] for help
 frame=  601 fps=546 q=2.0 Lsize=   11835kB time=00:00:10.02
 bitrate=9669.1kbits/s
 video:11815kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.169389%
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4596#comment:4>
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