#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>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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