[FFmpeg-trac] #2753(avcodec:new): MPNG artefacts

[FFmpeg]

#2753: MPNG artefacts
--------------------------------------+---------------------------------
               Reporter:  cehoyos     |                  Owner:
                   Type:  defect      |                 Status:  new
               Priority:  normal      |              Component:  avcodec
                Version:  git-master  |               Keywords:  png
             Blocked By:              |               Blocking:
Reproduced by developer:  0           |  Analyzed by developer:  0
--------------------------------------+---------------------------------
 The sample from ticket #2618 - http://samples.ffmpeg.org/PNG-seq/mpng.avi
 - shows artefacts.
 {{{
 $ ffmpeg -i mpng.avi out.avi
 ffmpeg version N-54438-gf0bcb13 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jul  4 2013 17:17:06 with gcc 4.7 (SUSE Linux)
   configuration:
   libavutil      52. 38.100 / 52. 38.100
   libavcodec     55. 18.100 / 55. 18.100
   libavformat    55. 11.100 / 55. 11.100
   libavdevice    55.  2.100 / 55.  2.100
   libavfilter     3. 78.100 /  3. 78.100
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, avi, from 'mpng.avi':
   Duration: 00:00:04.00, start: 0.000000, bitrate: 8987 kb/s
     Stream #0:0: Video: png (MPNG / 0x474E504D), rgba, 160x120 [SAR
 2834:2834 DAR 4:3], 40 tbr, 40 tbn, 40 tbc
 [mpeg4 @ 0x2f5ebe0] too many threads/slices (9), reducing to 8
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf55.11.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 160x120 [SAR
 1:1 DAR 4:3], q=2-31, 200 kb/s, 40 tbn, 40 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (png -> mpeg4)
 Press [q] to stop, [?] for help
 Input stream #0:0 frame changed from size:160x120 fmt:rgba to size:160x120
 fmt:rgb24
 Input stream #0:0 frame changed from size:160x120 fmt:rgb24 to
 size:160x120 fmt:pal8
 Input stream #0:0 frame changed from size:160x120 fmt:pal8 to size:160x120
 fmt:gray
 frame=  160 fps=0.0 q=6.6 Lsize=     206kB time=00:00:04.00 bitrate=
 420.9kbits/s
 video:196kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 4.825182%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2753>
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