ffvp9 fails to decode file libpvpx decodes just fine

[jimbankoski]

Summary of the bug:
How to reproduce:

%ffplay ffvp9_fails_where_libvpx.succeeds.webm

Broken ugly frames 

%ffplay -vcodec libvpx-vp9  ffvp9_fails_where_libvpx.succeeds.webm

Looks fine 

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

[jimbankoski]

example file that decodes fine in libvpx but is broken in ffvp9

[Clément Bœsch]

Confirmed. Doesn't look ASM related.

[~/src/ffmpeg]☭ ./ffplay -cpuflags none /tmp/ffvp9_fails_where_libvpx.succeeds.webm
ffplay version N-65523-g9a16214 Copyright (c) 2003-2014 the FFmpeg developers
  built on Aug 11 2014 20:39:35 with gcc 4.9.1 (GCC)
  configuration: --enable-gpl --enable-fontconfig --enable-libfreetype --enable-libmp3lame --enable-libvorbis --enable-libx264 --enable-libvpx --enable-x11grab --samples=/home/ubitux/fate-samples --assert-level=2 --cc='ccache cc'
  libavutil      54.  1.100 / 54.  1.100
  libavcodec     56.  0.100 / 56.  0.100
  libavformat    56.  0.100 / 56.  0.100
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  0.100 /  5.  0.100
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  0.100 /  1.  0.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, matroska,webm, from '/tmp/ffvp9_fails_where_libvpx.succeeds.webm':
  Metadata:
    encoder         : libwebm-0.2.1.0
  Duration: 00:00:26.20, start: 0.000000, bitrate: 800 kb/s
    Stream #0:0(eng): Video: vp9, yuv420p, 640x360, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)

[Carl Eugen Hoyos]

For future tickets:
Please always provide a ffmpeg command line that allows to reproduce the issue together with the complete, uncut console output.

$ ffmpeg -i ffvp9_fails_where_libvpx.succeeds.webm -ss 10 -t 10 -qscale 2 out.avi
ffmpeg version N-65523-g9a16214 Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug 11 2014 17:58:58 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      54.  1.100 / 54.  1.100
  libavcodec     56.  0.100 / 56.  0.100
  libavformat    56.  0.100 / 56.  0.100
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  0.100 /  5.  0.100
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  0.100 /  1.  0.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, matroska,webm, from 'ffvp9_fails_where_libvpx.succeeds.webm':
  Metadata:
    encoder         : libwebm-0.2.1.0
  Duration: 00:00:26.20, start: 0.000000, bitrate: 800 kb/s
    Stream #0:0(eng): Video: vp9, yuv420p, 640x360, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
Please use -q:a or -q:v, -qscale is ambiguous
Output #0, avi, to 'out.avi':
  Metadata:
    ISFT            : Lavf56.0.100
    Stream #0:0(eng): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc (default)
    Metadata:
      encoder         : Lavc56.0.100 mpeg4
Stream mapping:
  Stream #0:0 -> #0:0 (vp9 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
frame=  300 fps=0.0 q=2.0 Lsize=    2099kB time=00:00:10.00 bitrate=1719.6kbits/s
video:2086kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.613195%

[Clément Bœsch]

Fixed by Ronald in 14e3025518124f99cb0f5885feb603a9f217d25d.

Thank you for the report.