[FFmpeg-trac] #1282(avcodec:open): VP6F Libavcodec decoding bug (was: FLV4 / VP6 Libavcodec decoding bug)

[FFmpeg]

#1282: VP6F Libavcodec decoding bug
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  theshadowrunner                    |                   Status:  open
                 Type:  defect       |                Component:  avcodec
             Priority:  normal       |               Resolution:
              Version:  git-master   |               Blocked By:
             Keywords:  vp6f         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * status:  new => open
 * reproduced:  0 => 1
 * component:  FFmpeg => avcodec
 * version:  unspecified => git-master
 * keywords:  FLV4, VP6, Libacodec => vp6f


Comment:

 Not a regression, afaict (see issue 965).
 {{{
 ffmpeg -i sample_artefact.flv -q:v 2 -an out.avi
 ffmpeg version N-40448-g16b9156 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on May  7 2012 16:44:46 with gcc 4.3.2
   configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl
   libavutil      51. 49.100 / 51. 49.100
   libavcodec     54. 19.100 / 54. 19.100
   libavformat    54.  4.100 / 54.  4.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 72.104 /  2. 72.104
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 11.100 /  0. 11.100
   libpostproc    52.  0.100 / 52.  0.100
 Input #0, flv, from 'sample_artefact.flv':
   Metadata:
     creationdate    : Fri Oct 29 19:33:39 2010
                     :
     lastkeyframetimestamp: 540632
     lasttimestamp   : 544207
     On2             : Technologies
   Duration: 00:02:36.19, start: 0.000000, bitrate: 508 kb/s
     Stream #0:0: Video: vp6f, yuv420p, 596x336, 30 tbr, 1k tbn, 1k tbc
     Stream #0:1: Audio: mp3, 44100 Hz, mono, s16, 48 kb/s
 [buffer @ 0x8f3f160] w:596 h:336 pixfmt:yuv420p tb:1/1000000 sar:0/1
 sws_param:flags=2
 Output #0, avi, to 'out.avi':
   Metadata:
     creationdate    : Fri Oct 29 19:33:39 2010
                     :
     lastkeyframetimestamp: 540632
     lasttimestamp   : 544207
     On2             : Technologies
     ISFT            : Lavf54.4.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 596x336,
 q=2-31, 200 kb/s, 30 tbn, 30 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (vp6f -> mpeg4)
 Press [q] to stop, [?] for help
 frame= 3193 fps=118 q=2.0 Lsize=   28060kB time=00:01:46.43
 bitrate=2159.8kbits/s
 video:27978kB audio:0kB global headers:0kB muxing overhead 0.292999%
 }}}
 {{{
 $ ffmpeg -i bleeding_pixelated_video.flv -q:v 2 -an out.avi
 ffmpeg version N-40448-g16b9156 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on May  7 2012 16:44:46 with gcc 4.3.2
   configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl
   libavutil      51. 49.100 / 51. 49.100
   libavcodec     54. 19.100 / 54. 19.100
   libavformat    54.  4.100 / 54.  4.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 72.104 /  2. 72.104
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 11.100 /  0. 11.100
   libpostproc    52.  0.100 / 52.  0.100
 Input #0, flv, from 'bleeding_pixelated_video.flv':
   Duration: 00:00:24.59, start: 0.000000, bitrate: 3330 kb/s
     Stream #0:0: Video: vp6f, yuv420p, 640x368, 25 tbr, 1k tbn, 1k tbc
     Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16, 64 kb/s
 [buffer @ 0x8f6d920] w:640 h:368 pixfmt:yuv420p tb:1/1000000 sar:0/1
 sws_param:flags=2
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf54.4.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 640x368,
 q=2-31, 200 kb/s, 25 tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (vp6f -> mpeg4)
 Press [q] to stop, [?] for help
 frame=  411 fps= 60 q=2.0 Lsize=   21966kB time=00:00:16.48
 bitrate=10919.1kbits/s
 video:21951kB audio:0kB global headers:0kB muxing overhead 0.070154%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1282#comment:2>
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