[FFmpeg-trac] #2275(avcodec:new): artifacts on decoding PNG file with alpha

[FFmpeg]

#2275: artifacts on decoding PNG file with alpha
--------------------------------------+-----------------------------------
               Reporter:  saste       |                  Owner:
                   Type:  defect      |                 Status:  new
               Priority:  normal      |              Component:  avcodec
                Version:  git-master  |               Keywords:  png alpha
             Blocked By:              |               Blocking:
Reproduced by developer:  1           |  Analyzed by developer:  0
--------------------------------------+-----------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 fmpeg -i  http://ffmpeg.org/ffmpeg-logo.png out.bmp
 ffmpeg version N-50039-g9cfe7a3 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Feb 17 2013 13:21:08 with gcc 4.6 (Ubuntu/Linaro
 4.6.3-1ubuntu5)
   configuration: --enable-pic --enable-fontconfig --enable-libschroedinger
 --enable-libass --enable-version3 --prefix=/home/stefano --enable-libx264
 --enable-libfaac --disable-shared --enable-static --enable-debug=3
 --enable-pthreads --enable-libvorbis --enable-gpl --enable-nonfree
 --enable-libmp3lame --enable-libtheora --enable-gpl --enable-x11grab
 --enable-frei0r --enable-libspeex --enable-libcaca --enable-libflite
 --enable-libfreetype --enable-libopencv --enable-libopencore-amrnb
 --enable-libopencore-amrnb --disable-optimizations
   libavutil      52. 17.101 / 52. 17.101
   libavcodec     54. 92.100 / 54. 92.100
   libavformat    54. 63.100 / 54. 63.100
   libavdevice    54.  3.103 / 54.  3.103
   libavfilter     3. 38.103 /  3. 38.103
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
 Input #0, image2, from 'http://ffmpeg.org/ffmpeg-logo.png':
   Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: png, rgba, 396x100, 25 tbr, 25 tbn, 25 tbc
 Output #0, image2, to 'out.bmp':
   Metadata:
     encoder         : Lavf54.63.100
     Stream #0:0: Video: bmp, bgra, 396x100, q=2-31, 200 kb/s, 90k tbn, 25
 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (png -> bmp)
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
 video:155kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 -100.013884%
 }}}

 or alternatively:
 {{{
 ffplay http://ffmpeg.org/ffmpeg-logo.png
 }}}

 The output is garbled.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2275>
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