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You can replace the --exec 'ffmpeg ...' with just -x (or the long form --extract-audio).

Yes, but with opus, that only put's the audio in a .opus container, which isn't as widely compatible as the .ogg container.

It is literally the same bits. Feel free to change the extension if that helps (it does on some old Android versions, for sure).

Source: I am a co-author on RFC 6716 and RFC 7845.

Oh, good to know, thanks :)