When I convert any audio or even video (for example MKA or MP3) to M4A ffmpeg keep metadata (TAGs) like Title, Artist etc, but I cannot edit it by MP3TAG as encoded file has no MPEG4 IOD/OD even MediaInfo shows that metadata. Another thing that cover is loose as used -vn.
Is any solutions to
1.write IOD/OD
and
2.keep cover images?