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

FFmpeg trac at avcodec.org
Tue Apr 4 02:53:39 EEST 2017

#6286: apng doesn't play correct
             Reporter:  hxuanyu     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  png         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |

Comment (by hxuanyu):

 Thanks cehoyos,

 I'll be more precise next time.

 As for this bug, actually I'm a bit confused. The spec says dispose_op = 1
 means the frame's region of the output buffer is to be cleared to fully
 transparent black before rendering the next frame.

 So before 2nd frame is shown, 1st frame buffer 100x100 area should be
 cleared. So actually current ffmpeg behavior is correct?

 Replying to [comment:1 cehoyos]:
 > How is this issue related to FFplay?

Ticket URL: <https://trac.ffmpeg.org/ticket/6286#comment:2>
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