[FFmpeg-trac] #10792(undetermined:new): After threaded architecture change, conversion of inputs with DVD subtitles yields incorrect duration and progress is strange
FFmpeg
trac at avcodec.org
Fri Jan 12 02:40:42 EET 2024
#10792: After threaded architecture change, conversion of inputs with DVD subtitles
yields incorrect duration and progress is strange
-------------------------------------+-------------------------------------
Reporter: Marth64 | Owner: (none)
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: unspecified | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Description changed by Marth64:
Old description:
> Summary of the bug:
>
> After threaded architecture change, conversion of inputs with DVD
> subtitles yields incorrect duration and progress is strange. For longer
> files, ffmpeg will see time as N/A for couple seconds, while bitrate
> grows unrealistically high. In all cases, output duration is printed
> wrong.
>
> Discovered this while working on DVD demuxer, but issue is independent of
> the demuxer entirely.
>
> Can be reproduced with sample file already available:
> https://samples.ffmpeg.org/MPEG-
> VOB/inverse_telecine_problem/vts_01_1.1st_50M.vob
>
> Also, attached a video showing a more severe example on a longer video.
>
> How to reproduce:
> {{{
> ffmpeg -probesize 512M -analyzeduration 60000000 -fflags +genpts -i
> vts_01_1.1st_50M.vob -map 0:v -map 0:a -map 0:s -c copy -f matroska
> Parallelissue.mkv
> }}}
New description:
Summary of the bug:
After threaded architecture change, conversion of inputs with DVD
subtitles yields incorrect duration and progress is strange. For longer
files, ffmpeg will see time as N/A for couple seconds, while bitrate grows
unrealistically high. In all cases, output duration is printed wrong.
Discovered this while working on DVD demuxer, but issue is independent of
the demuxer entirely.
Can be reproduced with sample file already available:
https://samples.ffmpeg.org/MPEG-
VOB/inverse_telecine_problem/vts_01_1.1st_50M.vob
Issue is not reproducible prior to this change.
How to reproduce:
{{{
ffmpeg -probesize 512M -analyzeduration 60000000 -fflags +genpts -i
vts_01_1.1st_50M.vob -map 0:v -map 0:a -map 0:s -c copy -f matroska
Parallelissue.mkv
}}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/10792#comment:1>
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