[FFmpeg-trac] #1340(avcodec:new): Possibly suboptimal H.264 error concealment

[FFmpeg]

#1340: Possibly suboptimal H.264 error concealment
--------------------------------------+---------------------------------
               Reporter:  cehoyos     |                  Owner:
                   Type:  defect      |                 Status:  new
               Priority:  normal      |              Component:  avcodec
                Version:  git-master  |               Keywords:  h264
             Blocked By:              |               Blocking:
Reproduced by developer:  0           |  Analyzed by developer:  0
--------------------------------------+---------------------------------
 (Related to issue 2564)

 I will attach a cut transport stream (that is possibly corrupted), the
 first ~eleven frames are decoded correctly, then three corrupted frames
 follow.

 Older versions of FFmpeg simply skipped the broken frames (and caused no
 easily visible corruption except for error messages from the h264
 decoder), current git head shows severely broken frames.
 {{{
 $ ffmpeg -i missingframe.ts -f null -vframes 40 -
 ffmpeg version N-40924-g349c624 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on May 21 2012 07:59:42 with gcc 4.3.2
   configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl --enable-
 libopenjpeg --enable-libvorbis --enable-libspeex --enable-libmp3lame
 --enable-libtheora --extra-ldflags=-lm
   libavutil      51. 53.100 / 51. 53.100
   libavcodec     54. 21.101 / 54. 21.101
   libavformat    54.  5.101 / 54.  5.101
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 75.100 /  2. 75.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 [h264 @ 0x8f10040] Increasing reorder buffer to 1
 [mpegts @ 0x8f0c3c0] PES packet size mismatch
     Last message repeated 1 times
 Input #0, mpegts, from 'missingframe.ts':
   Duration: 00:00:01.56, start: 0.200000, bitrate: 13128 kb/s
   Program 1
     Stream #0:0[0x200]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
 yuvj420p, 1920x1080 [SAR 1:1 DAR 16:9], 50 fps, 25 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x294](eng): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz,
 stereo, s16, 384 kb/s
 [buffer @ 0x8f09ee0] w:1920 h:1080 pixfmt:yuvj420p tb:1/90000 sar:1/1
 sws_param:flags=2
 [buffersink @ 0x8f0a280] No opaque field provided
 Output #0, null, to 'pipe:':
   Metadata:
     encoder         : Lavf54.5.101
     Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuvj420p, 1920x1080
 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 25 tbc
     Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 -> rawvideo)
   Stream #0:1 -> #0:1 (ac3 -> pcm_s16le)
 Press [q] to stop, [?] for help
 [null @ 0x8f0ec80] Encoder did not produce proper pts, making some up.
 [h264 @ 0x8f10040] mmco: unref short failure
     Last message repeated 2 times
 [h264 @ 0x8f10040] Increasing reorder buffer to 2
 frame=   40 fps= 26 q=0.0 Lsize=       0kB time=00:00:01.23 bitrate=
 0.0kbits/s dup=8 drop=0
 video:0kB audio:186kB global headers:0kB muxing overhead -100.000000%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1340>
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