www.makemkv.com

I now discovered the root cause:

The video track is much shorter than the audio tracks. This causes MakeMkv to get chapters wrong. So it is easier to just copy the audio tracks - the resulting file splits up fine.

Chapters are copied automatically, example is for audio in tracks 1 and 2.

ffmpeg ...

The issue is still there in the latest version. I use the following steps:

- Extract all titles with MakeMKV
- Edit chapter times with MKVToolNix (will not split correctly after editing)
- Split using ffmpeg (adjust "map 0:" to get desired track)

Tried with King Crimson.

#!/bin/bash
ffmpeg -i ...