[FFmpeg-trac] #10681(avcodec:new): dvdsubdec: use pts of initial packet

[FFmpeg]

#10681: dvdsubdec: use pts of initial packet
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             Reporter:  valverde     |                    Owner:  (none)
                 Type:  enhancement  |                   Status:  new
             Priority:  normal       |                Component:  avcodec
              Version:  unspecified  |               Resolution:
             Keywords:  dvdsubdec    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by valverde):

 Yes it's straight forward. But I guess every dvd sub user of that function
 has to implement that. Sounds like something a library could take care of
 for convenience. So I thought why not ffmpeg itself, as decode subtitle
 evidently already has internal state.
 But I have no knowledge of the conventions or principles of ffmpeg so
 please excuse me for this naive question.
 Maybe add a sentence to the documentation of decode subtitle to make it
 clear?
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Ticket URL: <https://trac.ffmpeg.org/ticket/10681#comment:2>
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