JD meant to write:
Is there a way to tell youtube-dl to save "the best formats of
audio and
video" of a download into mp4.
I think the --merge-output-format option is what you're looking for:
https://github.com/rg3/youtube-dl/blob/master/README.md#video-format-options
--
Todd
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Hofstadter's Law: It always takes longer than you expect, even when
you take into account Hofstadter's Law.
-- Douglas Hofstadter, Gödel, Escher, Bach: An Eternal Golden Braid