[Rico66]

As far as I know all Mka tags are still not read in Kodi, although I haven’t tested any recent versions.

You can create a CUE file for your mka files and Kodi will scan successfully or if using Kodi 19 you can tag and use m4a files successfully.

You can convert mka to m4a retaining the source codec with ffmpeg or with Music Media Helper’s Extract Audio from MKV/MKA tool in batch mode. Most tagging apps can tag m4a files as it’s a standard tag format (unlike mka).

Much appreciated Homerjau, m4a works like a charm! Conversion with ffmpeg is also easy and fast, without touching the AC3 content.

Yes, this works indeed fine for AC3 in M4A. However is there a similar option for DTS as well? The majority of audio files for which I've been using MKA with the cue sheet workaround is DTS, for which it doesn't seem to be possible to mux into M4A (without re-encoding)