套件：python3-ttconv（1.0.5-3）

library and tool for converting timed text or subtitle formats

ttconv is a library and command line application written in pure Python for converting between timed text formats used in the presentations of captions, subtitles, karaoke, etc.

Input formats: TTML / IMSC, SCC / CEA 608, EBU STL, SRT

Output formats: IMSC / TTML, WebVTT, SRT

Note, that the tool is called ttconv, not tt, i.e. use it like this:

ttconv convert -i subtitles.ttml -o subtitles.srt

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