Add {id} to mp4's comment metadata

[UndeadKitten]

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For archival purposes I'd like to save the {id} but it makes the title too long for my liking. I'd like to have an option to save the {id} to the "Comments" portion in the mp4's properties (similar to how youtube-dl can save the web address to Comments).

(Also I'd appreciate it if more fields of metadata are filled out like Contributing Artist and Title, but it's not entirely necessary.)