[FFmpeg-trac] #6286(undetermined:new): apng doesn't play correct

[FFmpeg]

#6286: apng doesn't play correct
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             Reporter:  hxuanyu      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 This issue is reproducible on latest ffplay build

 >> ffplay.exe png1.apng
 >> ffplay version N-85091-g23ae3cc Copyright (c) 2003-2017 the FFmpeg
 developers

 This apng file includes 3 frames:
 1. 1st a 100x100 white frame, dispose_op = 1
 2. 2nd a 50x50 red frame, dispose_op = 1
 3. 3rd a 50x50 blue frame, dispose_op = 1

 while played in ffplay, when 2nd and 3rd frames are played, background is
 black.

 But when played in Mozilla Firefox or disassembled by APNG
 Disassembler2.8, 2nd and 3rd frames have white background!

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Ticket URL: <https://trac.ffmpeg.org/ticket/6286>
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