[dearrifling]

Awesome! According to the description of the internals this only works with offsets and doesn't adjust the subtitle's playback speed. I think playback speed variations are not that broad, it's usually caused by playing a subtitle written for a given FPS played back on a different FPS video. It might worth it to try common FPS ratios at once and keep the best match.

[aasasd]

In the case when resulting subtitles turn out to be shorter than the input file, subtitle editing software like Aegisub can automatically trim ending times so they don't overlap with starting times.

This could probably be similarly done in the script itself in the future.

If the result gets longer and the times for each line are a bit too short―I guess you'll have to read faster, har har.

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Actually, iirc Aegisub can also do automatic stretching for different FPS, since that's a rather easy case.

However, it's not enough when the subs are from a different media release or an edit―which made me long for exactly the kind of solution like in the post.

[iforgotpassword]

Yes that would be great, happens a lot when moving between pal and NTSC regions.