[FFmpeg-trac] #2523(avcodec:new): vc1 artefacts

[FFmpeg]

#2523: vc1 artefacts
--------------------------------------+---------------------------------
               Reporter:  cehoyos     |                  Owner:
                   Type:  defect      |                 Status:  new
               Priority:  normal      |              Component:  avcodec
                Version:  git-master  |               Keywords:  vc1
             Blocked By:              |               Blocking:
Reproduced by developer:  0           |  Analyzed by developer:  0
--------------------------------------+---------------------------------
 I will attach a raw vc1 file with 29 frames, the first six and the last
 frame are decoded bit-exact with skip_loop_filter, the remaining 22 frames
 show visible artefacts.
 {{{
 $ ffmpeg -i vc1_from_bluray_does_not_play_timeout_cut.vc1 -qscale 2
 out.avi
 ffmpeg version N-52591-gfbaf75b Copyright (c) 2000-2013 the FFmpeg
 developers
   built on May  1 2013 03:24:07 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 27.101 / 52. 27.101
   libavcodec     55.  6.100 / 55.  6.100
   libavformat    55.  3.100 / 55.  3.100
   libavdevice    55.  0.100 / 55.  0.100
   libavfilter     3. 61.101 /  3. 61.101
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, vc1, from 'vc1_from_bluray_does_not_play_timeout_cut.vc1':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: vc1 (Advanced), yuv420p, 1920x1080 [SAR 1:1 DAR
 16:9], 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
 Please use -q:a or -q:v, -qscale is ambiguous
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf55.3.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1920x1080 [SAR
 1:1 DAR 16:9], q=2-31, 200 kb/s, 29.97 tbn, 29.97 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (vc1 -> mpeg4)
 Press [q] to stop, [?] for help
 frame=   29 fps=0.0 q=2.0 Lsize=    2748kB time=00:00:01.00
 bitrate=22486.3kbits/s
 video:2741kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 0.231378%
 }}}

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2523>
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