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

[FFmpeg]

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

[FFmpeg]

#10681: dvdsubdec: use pts of initial packet
-+---
 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|
-+---
Comment (by Balling):

 That makes no sense. It is obvious that is there is no PTS you need to
 look at last packet with PTS.
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[FFmpeg-trac] #10681(avcodec:new): dvdsubdec: use pts of initial packet

[FFmpeg]

#10681: dvdsubdec: use pts of initial packet
---+---
 Reporter:  valverde   | Type:  enhancement
   Status:  new| Priority:  normal
Component:  avcodec|  Version:  unspecified
 Keywords:  dvdsubdec  |   Blocked By:
 Blocking: |  Reproduced by developer:  0
Analyzed by developer:  0  |
---+---
 The pts is only returned with the first packet, while the subtitle is
 usually still incomplete. Repeating the pts with the completed subtitle
 would be helpful.
 The function called is avcodec_decode_subtitle2 and it concerns at least
 dvd subtitles.

 I stumbled upon this through handbrake no longer handling dvd subtitles
 well in debian bookworm. This lead me to
 https://github.com/HandBrake/HandBrake/blob/master/contrib/ffmpeg/A07
 -dvdsubdec-use-pts-of-initial-packet.patch which saves the pts for
 incomplete subtitles and returns it with the completed subtitle (when all
 packets were processed). Seems like a generally useful feature to me, not
 only for handbrake. I didn't find any discussion on this topic yet.
-- 
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