[FFmpeg-trac] #11464(avfilter:new): Subtitles extracted out of order 608 TS [out+subcc]

[FFmpeg]

#11464: Subtitles extracted out of order 608 TS [out+subcc]
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             Reporter:  Monquis       |                     Type:  defect
               Status:  new           |                 Priority:  minor
            Component:  avfilter      |                  Version:  7.1
             Keywords:  eia-608 atsc  |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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 Summary of the bug: Subtitle extraction either mis-orders or completely
 misses initial lines of specific broadcasts. I've noticed it on
 commercials during work on identification, but it may be revealing a
 subtle bug.  The same commercials, during different shows.  If one is
 affected, it seems always affected.  If not, it seems never affected.
 This happens on streams validated using  Cinegy / TsAnalyser (on github).
 This is not canonical validation, but nothing major seems incorrect.

 Minor output variation such as spelling can happen of course, but in
 either a clean capture or mildly corrupt the output is consistently out of
 order.

 Source: USA ATSC via Hauppauge, captured by (Hauppauge) WinTV or NextPVR
 latest versions.  WinTV retains the caption stream AFAICT, NextPVR muxes
 it into the MPEG. Same output.

 How to reproduce:
 ffmpeg.exe -report -n -f lavfi -i
 "movie='subtitles_out_of_order.ts'[out+subcc]" -map s -f SRT
 subtitles_out_of_order.srt
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Ticket URL: <https://trac.ffmpeg.org/ticket/11464>
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