[FFmpeg-user] Transmux .m4a file, keep metadata, copy video stream

[Sarah Mogielnicki]

I'd like to transmux an .m4a file, keep its (known and custom) metadata,
and keep its video stream. The video stream has a JPEG image in it, which
is the "album art" for the audio track.


If I use this command:

ffmpeg -i input.m4a -movflags +faststart -movflags use_metadata_tags -c:a
copy -c:v copy output.m4a

the video stream does not copy to output.m4a, but the file is transmuxed
and all of the metadata is copied.

If I use this command:
ffmpeg -i input.m4a -movflags +faststart -c:a copy -c:v copy output.m4a

the video stream copies to output.m4a, and the file is transmuxed, but
(obviously) the metadata is not copied.


Is there a way to achieve all three goals?


Sarah