On 03-05-2020 08:36 pm, Manolis Stamatogiannakis wrote:
Hello,
I've noticed what appears to be a bug/missing feature in the subtitles
filter: when "-ss" is used for the input, it is not applied to the
subtitles stream. E.g., for the following command line, the video playback
will start on 20:10, but the subtitles will start from 00:00.
ffmpeg -re -ss 20:10.00 -i input.mp4
-vf subtitles=subs.srt \
-c:v libx264 crf 25 -c:a aac -ab 160k \
-strict experimental \
-f flv $RTMP_URL
This should be fairly straightforward to fix and review, so I'd like to
directly submit a patch rather than opening a bug and having someone else
fix it. As I'm not an expert with the ffmpeg internals, I'd like some
guidance on implementing a proper fix.
What would be considered more appropriate:
(a) automatically skipping the subtitles for the time specified by -ss?
(b) adding a shift option to the subtitles filter that allows shifting
subtitles time by specific time?
(c) something else I can't think of?
-ss executes a seek for that input. The subtitles filter does not have
access to that data. You can add an option to the subtitles filter that
also carries out a seek. And make sure to adjust timestamps depending on
the seek match.
Gyan
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