[FFmpeg-trac] #869(swscale:new): bgr0 -> bgra does not make the output opaque

[FFmpeg]

#869: bgr0 -> bgra does not make the output opaque
--------------------------------------+---------------------------------
               Reporter:  cehoyos     |                  Owner:  michael
                   Type:  defect      |                 Status:  new
               Priority:  normal      |              Component:  swscale
                Version:  git-master  |               Keywords:  alpha
             Blocked By:              |               Blocking:
Reproduced by developer:  0           |  Analyzed by developer:  0
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 If I decode attached sample with current FFmpeg, pix_fmt is currently
 identified as bgr0, but on conversion to bgra, the output is transparent
 (instead of opaque).
 {{{
 ffmpeg -i out.avi -pix_fmt bgra out.png
 ffmpeg version N-36363-g0af34c4, Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Jan  3 2012 01:15:46 with gcc 4.5.3
   configuration: --cc='/usr/local/gcc-4.5.3/bin/gcc -m32'
   libavutil      51. 33.100 / 51. 33.100
   libavcodec     53. 50.100 / 53. 50.100
   libavformat    53. 29.100 / 53. 29.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 57.101 /  2. 57.101
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  5.100 /  0.  5.100
 Input #0, avi, from 'out.avi':
   Metadata:
     encoder         : Lavf52.108.0
   Duration: 00:00:00.04, start: 0.000000, bitrate: 21647 kb/s
     Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), bgr0, 256x256, 25 tbr,
 25 tbn, 25 tbc
 [buffer @ 0x8dcdd20] w:256 h:256 pixfmt:bgr0 tb:1/1000000 sar:0/1
 sws_param:
 [buffersink @ 0x8dced80] auto-inserting filter 'auto-inserted scale 0'
 between the filter 'src' and the filter 'out'
 [scale @ 0x8dcf2e0] w:256 h:256 fmt:bgr0 -> w:256 h:256 fmt:bgra flags:0x4
 Output #0, image2, to 'out.png':
   Metadata:
     encoder         : Lavf53.29.100
     Stream #0:0: Video: png, bgra, 256x256, q=2-31, 200 kb/s, 90k tbn, 25
 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (ffv1 -> png)
 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:191kB audio:0kB global headers:0kB muxing overhead -100.000000%
 }}}
 out.png is transparent

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/869>
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