I should add that's a 341KB opus file at 16kbps.
The flac file it was derived from (found here: https://archive.org/details/78_st-louis-blues_w-c-handy_gbia0030859a/St.+Louis+Blues+-+W.+C.+Handy-restored.flac) is over 60MB.
I went from over 60MB to just over 1/3 of an MB.
And a close listen with some good headphones or speakers will reveal some minor differences on the compressed file, but holy shit it's 341KB.
@ajroach42 at those bitrates it might be guessing wrong which codec to use; you can set it straight by specifying --music on the opusenc command line, and it really does make a difference
$ ffmpeg -i 'St. Louis Blues - W. C. Handy-restored.flac' -ar 8000 handy-blues.wav
$ opusenc --bitrate 10 --music --downmix-mono handy-blues.wav handy-blues.opus
i think it sounds objectively quite good, and for 10kbps somewhat miraculous
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