[FFmpeg-trac] #6815(avcodec:open): Regression recovering broken H264 stream

[FFmpeg]

#6815: Regression recovering broken H264 stream
-------------------------------------+-------------------------------------
             Reporter:  w3sip        |                    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 regression
 * status:  new => open
 * version:  unspecified => git-master
 * reproduced:  0 => 1


Comment:

 Regression since 78c7197ea0e5c53393849a32dd6f49e3b89f7815
 {{{
 $ ffmpeg -flags2 +chunks -threads 1 -i brokenStream_cut.h264 out.mp4
 ffmpeg version N-88612-gce52e43 Copyright (c) 2000-2017 the FFmpeg
 developers
   built with gcc 6.3.0 (GCC)
   configuration: --enable-gpl
   libavutil      56.  0.100 / 56.  0.100
   libavcodec     58.  1.100 / 58.  1.100
   libavformat    58.  2.100 / 58.  2.100
   libavdevice    58.  0.100 / 58.  0.100
   libavfilter     7.  0.101 /  7.  0.101
   libswscale      5.  0.101 /  5.  0.101
   libswresample   3.  0.101 /  3.  0.101
   libpostproc    55.  0.100 / 55.  0.100
 Input #0, h264, from 'brokenStream_cut.h264':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x720, 25
 fps, 25 tbr, 1200k tbn, 50 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
 Press [q] to stop, [?] for help
 Output #0, mp4, to 'out.mp4':
   Metadata:
     encoder         : Lavf58.2.100
     Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 1280x720,
 q=2-31, 200 kb/s, 25 fps, 12800 tbn, 25 tbc
     Metadata:
       encoder         : Lavc58.1.100 mpeg4
     Side data:
       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
 [h264 @ 0x39b7f20] concealing 1580 DC, 1580 AC, 1580 MV errors in P frame
 [h264 @ 0x39b7f20] Frame num change from 13 to 14
 [h264 @ 0x39b7f20] decode_slice_header error
 [h264 @ 0x39b7f20] concealing 1580 DC, 1580 AC, 1580 MV errors in P frame
 [h264 @ 0x39b7f20] Frame num change from 13 to 15
 [h264 @ 0x39b7f20] decode_slice_header error

 ...

 [h264 @ 0x39b7f20] concealing 1580 DC, 1580 AC, 1580 MV errors in P frame
 [h264 @ 0x39b7f20] Frame num change from 13 to 1
 [h264 @ 0x39b7f20] decode_slice_header error
 [h264 @ 0x39b7f20] concealing 1580 DC, 1580 AC, 1580 MV errors in P frame
 [h264 @ 0x39b7f20] Frame num change from 13 to 0
 [h264 @ 0x39b7f20] decode_slice_header error
 [h264 @ 0x39b7f20] concealing 1580 DC, 1580 AC, 1580 MV errors in P frame
 frame=   45 fps=0.0 q=31.0 Lsize=     506kB time=00:00:01.76
 bitrate=2356.2kbits/s speed=2.21x
 video:505kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.203155%
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/6815#comment:3>
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