figment is a shell script which takes two audio files as arguments, plays a random one repeatedly and let's you guess which one had the better audio quality each time. After exiting with CTRL-C it will show you how many times you were right.

This could help you decide how strongly you want to compress your music library or similar.

You'll need mpv to use the script.

Example

$ ffmpeg -ss 00:45 -t 5 -i 07.Run_With_The_Wolves.flac -c:a libopus -b:a 96k good.opus
$ ffmpeg -ss 00:45 -t 5 -i 07.Run_With_The_Wolves.flac -c:a libopus -b:a 64k bad.opus
$ figment good.opus bad.opus
Was this [g]ood or [b]ad? g
Was this [g]ood or [b]ad? g
Was this [g]ood or [b]ad? b
Was this [g]ood or [b]ad? b
Was this [g]ood or [b]ad? b
Was this [g]ood or [b]ad? b
Was this [g]ood or [b]ad? g
^C
You were correct 3 out of 7 times (43%).