[FFmpeg-trac] #831(undetermined:new): gif: 1bpp with transparency decodes to black screen

[FFmpeg]

#831: gif: 1bpp with transparency decodes to black screen
-------------------------------------+-------------------------------------
             Reporter:  ami_stuff    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 {{{
 C:\>ffmpeg -i 1bpp_transparent_white.gif out.bmp
 ffmpeg version N-36088-gdd1fb65, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Dec 22 2011 12:39:23 with gcc 4.6.2
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-ru
 ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-
 libope
 ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-
 libgsm --en
 able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-
 libschroedinger -
 -enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-
 amrwben
 c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs
 --enable-
 libxvid --enable-zlib
   libavutil      51. 32.100 / 51. 32.100
   libavcodec     53. 47.100 / 53. 47.100
   libavformat    53. 28.100 / 53. 28.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 53.  0 /  2. 53.  0
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  5.100 /  0.  0.100
   libpostproc    51.  2.100 / 51.  2.100
 Input #0, image2, from '1bpp_transparent_white.gif':
   Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: gif, pal8, 999x749, 25 tbr, 25 tbn, 25 tbc
 [buffer @ 020F1340] w:999 h:749 pixfmt:pal8 tb:1/1000000 sar:0/1
 sws_param:
 Output #0, image2, to 'out.bmp':
   Metadata:
     encoder         : Lavf53.28.100
     Stream #0:0: Video: bmp, pal8, 999x749, q=2-31, 200 kb/s, 90k tbn, 25
 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (gif -> bmp)
 Press [q] to stop, [?] for help
 frame=    1 fps=  0 q=0.0 Lsize=       0kB time=00:00:00.04 bitrate=
 0.0kbits/
 s
 video:732kB audio:0kB global headers:0kB muxing overhead -100.000000%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/831>
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