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