vc1 artefacts

[Carl Eugen Hoyos]

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%

[Carl Eugen Hoyos]

Fixed by Michael.