write into FLAC files via cli

[foremtehan]

I use eyeD3 cli to write tags, But looks like it only working for mp3 files

eyeD3 --artist "My Artist" 01 A Million Miles Away.flac

I won't get any error but tags never written. same for m4a files.

[nicfit]

eyeD3 requires understanding FLAC and m4a audio formats for this. Duplicate of #404