#11464: Subtitles extracted out of order 608 TS [out+subcc]
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Reporter: Monquis | Owner: (none)
Type: defect | Status: new
Priority: minor | Component: avfilter
Version: 7.1 | Resolution:
Keywords: eia-608 atsc | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Description changed by Monquis:
Old description:
> 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
New description:
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. EX:
According to selecting CC1 in VLC, this should be
"Okay everyone, our mission is to provide complete, balanced nutrition for
strength and energy Yay - Woo Hoo!".
The result instead is:
14
00:00:38,672 --> 00:00:40,741
<font face="Monospace">{\an7}\h\h\hbalanced nutrition
for strength and energy.</font>
15
00:00:40,741 --> 00:00:42,176
<font face="Monospace">{\an7}Okay everyone, our mission
\h\h\h\h\h\hYay - Woo Hoo!</font>
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#comment:2>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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