[FFmpeg-trac] #4816(avcodec:reopened): png: wrong alpha detection

[FFmpeg]

#4816: png: wrong alpha detection
-------------------------------------+-------------------------------------
             Reporter:  pszemus      |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  png alpha    |               Blocked By:
  regression                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:  png alpha => png alpha regression
 * priority:  normal => important
 * status:  closed => reopened
 * resolution:  fixed =>


Comment:

 Broken since 72eaf726236331e739952806a5fe47b40165ac76
 {{{
 $ ffmpeg -i ../Samples/tickets/ticket4816/55c99e750a5fd6_50314226.png
 ffmpeg version N-78994-gbd2cc3c Copyright (c) 2000-2016 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      55. 19.100 / 55. 19.100
   libavcodec     57. 28.100 / 57. 28.100
   libavformat    57. 28.101 / 57. 28.101
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 39.102 /  6. 39.102
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 Input #0, png_pipe, from
 '../Samples/tickets/ticket4816/55c99e750a5fd6_50314226.png':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: png, rgb24(pc), 330x330, 25 tbr, 25 tbn, 25 tbc
 At least one output file must be specified
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4816#comment:5>
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