How to add chapter metadata?

[studioph]

With the ffmpeg CLI, you have to make a FFMETADATA file with the chapter start/end info and include it as an input when remuxing. I was looking for a way to to add chapters using PyAV and so far have not found anything. I've tried poking around an existing MKV file that has chapters in a REPL but cannot find anything that contains the chapter metadata. Is it true then that this functionality is not exposed at the moment?

[phzhitnikov]

+1 for this