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Given this file I am having mixed results writing metadata. For example this command

ffmpeg -i confetti.mp4 -c copy -f adts - |
ffmpeg -i - -c copy -bsf aac_adtstoasc -movflags faststart \
  -metadata title=Confetti good.m4a

Will generate an M4A file that plays correctly with metadata that is recognized. However this command

ffmpeg -i confetti.mp4 -c copy -vn -movflags faststart \
  -metadata title=Confetti bad.m4a

Generates a file that plays correctly, but my player does not recognize the metadata. Note I also tried adding -bsf aac_adtstoasc to the bad command to no avail. How can I tweak the second command to get it working?

Related ticket with command-line output

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