

GNU parallel, to run commands on all cores, and for its filename pattern substitution.
For example: ls *.flac | parallel ffmpeg -i {} {.}.mp3
encodes a directory of FLAC files to MP3. parallel -a <(ls *.flac) -a <(ls *.mp3) --xapply copytags {1} {2}
then copies each FLAC file’s metadata to the corresponding MP3 file (which ffmpeg already does, just to illustrate the --xapply
option).
edit: copytags
is https://github.com/DarwinAwardWinner/copytags if that’s useful for anyone.
https://addons.mozilla.org/en-US/firefox/addon/redirect-bypasser-webextension/ in desktop Firefox seems to work for your link. For mobile there might be apps that you share the link to and they dissect it, but a very quick search didn’t turn up anything.