[FFmpeg-trac] #5346(avcodec:new): H264 seeking shows incomplete frames

[FFmpeg]

#5346: H264 seeking shows incomplete frames
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  important  |              Component:  avcodec
                Version:  git-       |               Keywords:  h264 seek
  master                             |  regression
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 A user uploaded a H264 sample that shows artefacts on seeking since
 78265fcfeee153e5e26ad4dbc7831a84ade447d6
 {{{
 $ ffmpeg -ss 1 -i Tennis_test_recording_cut.m2ts -qscale 2 -vframes 8
 out.avi
 ffmpeg version N-79068-g6b7ce0e Copyright (c) 2000-2016 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      55. 19.100 / 55. 19.100
   libavcodec     57. 28.103 / 57. 28.103
   libavformat    57. 28.102 / 57. 28.102
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 39.102 /  6. 39.102
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 Input #0, mpegts, from 'Tennis_test_recording_cut.m2ts':
   Duration: 00:00:01.47, start: 0.387044, bitrate: 13949 kb/s
   Program 1
     Stream #0:0[0x1011]: Video: h264 (Main) (HDMV / 0x564D4448),
 yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 30.39 fps, 29.97 tbr,
 90k tbn, 59.94 tbc
     Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo,
 fltp, 384 kb/s
 Please use -q:a or -q:v, -qscale is ambiguous
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf57.28.102
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1920x1080 [SAR
 1:1 DAR 16:9], q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc
     Metadata:
       encoder         : Lavc57.28.103 mpeg4
     Side data:
       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
     Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp,
 192 kb/s
     Metadata:
       encoder         : Lavc57.28.103 ac3
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
   Stream #0:1 -> #0:1 (ac3 (native) -> ac3 (native))
 Press [q] to stop, [?] for help
 [h264 @ 0x34bf9c0] mmco: unref short failure
 [h264 @ 0x34788c0] mmco: unref short failure
 [h264 @ 0x34317c0] error while decoding MB 23 33, bytestream -10
 frame=    8 fps=0.0 q=2.0 Lsize=    2161kB time=00:00:00.33
 bitrate=53064.7kbits/s speed=2.02x
 video:2146kB audio:5kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.472254%
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/5346>
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