#11105: webvtt codec not seeking properly with output seeking
-------------------------------------+-------------------------------------
Reporter: Tristan | Type: defect
Matthews |
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: webvtt | Blocked By:
caption seeking |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
When trimming and muxing a video with accompanying VTT file (using output
seeking as per https://trac.ffmpeg.org/wiki/Seeking#Output), if I specify
`-c:s webvtt`the subtitles are not present as expected in the output.
However, if I use `-c:s copy` instead, the subtitles are present and line
up as expected.
How to reproduce:
Download https://people.videolan.org/~tmatth/samples/counting.mp4 and
https://people.videolan.org/~tmatth/samples/counting.vtt
and trim and mux them with:
{{{
% ffmpeg -i counting.mp4 -i counting.vtt -shortest -c:v copy -c:s webvtt
-ss 20s trimmed.mkv
}}}
To see the working/expected version, do:
{{{
% ffmpeg -i counting.mp4 -i counting.vtt -shortest -c:v copy -c:s copy -ss
20s trimmed.mkv
}}}
It's possible this should be filed as an "enhancement".
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11105>
FFmpeg <https://ffmpeg.org>
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