Support writing youtube video chapters as a CUE file

Checklist

• I’m reporting a feature request
• I’ve verified that I’m running youtube-dl version 2021.04.17
• I’ve searched the bugtracker for similar feature requests including closed ones

Description

I saw that youtube-dl supports --write-json-info, which includes the chapters of a video. It would be nice if we could get this as a CUE file format as another option. ~Winamp supports this file type as an automatic playlist generator, in a way. Poweramp does too.~ I was mistaken. Poweramp does this by default. Winamp requires a plugin.

I don’t expect youtube-dl to split the resulting file for me. I just expect a CUE file to be a possible output format for metadata, like --write-json-info. Perhaps with a flag like --write-chapters-as-CUE-file or something.

The workaround is that I can take the JSON file and process it into what I want, but I would prefer it if youtube-dl could do this for me.

I wrote an application that does this that could serve as inspiration (or workaround if this issue is closed): https://bitbucket.org/jevring/youtube-dl-chapters-to-cue/src/master/

[we-taper]

Ported @jevring script to python, with slight modifications, here.

[alexeik]

thanks)