[FFmpeg-trac] #7754(avformat:new): cdg: should not set duration on frames

[FFmpeg]

#7754: cdg: should not set duration on frames
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             Reporter:  gdesmott  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 The CDG demuxer sets an invalid duration on frames. The actual frame
 duration is unknown as the frame should be displayed until we encounter
 the next CDG packet.

 I proposed a patch setting duration to AV_NOPTS_VALUE but I've been told
 this was not the proper way to do it, see http://ffmpeg.org/pipermail
 /ffmpeg-devel/2019-February/240026.html

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Ticket URL: <https://trac.ffmpeg.org/ticket/7754>
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