Once youve created MKA files as backups for CD library. How can you use these single files to burn an Audio CD and or retrieve the cover jpg embedded in the file.

Note: I'm at a work computer without mkvtoolnix, so this probably has things wrong with it, especially the mkvextract line.

Use mkvmerge -i audio.mka to get the numbers of the streams and attachments.

Then use mkvextract audio.mka 3:theaudio.flac 5:thecuesheet.cue 8:thecoverart.png

The html documentation for mkvextract explains this pretty well. I don't know how to make a cuesheet out of just the chapters in the mka file though.