Convert TTML Subtitles to STL or SRT in Linux

Question

I want to convert a file with TTML subtitles preferably to STL, or to SRT (less preferred). I thought that I would be able to do it with ffmpeg but apparently they do not support it, because the TTML is XML-based. My main goal is to find a way to do this using the command line, so I can use it in a script.

Answer 1

The ttconv Python package will do it. It can be installed with pip.

Answer 2

If you need more formats and better file parsing capabilities, you can use subtitles package

php subtiltes.phar input.ttml output.stl