====== Quality offered by codecs ======

''libopus > libvorbis >= libfdk_aac > aac > libmp3lame >= eac3/ac3 > libtwolame > vorbis > mp2 > wmav2/wmav1''

====== Opus ======

<code bash>
ffmpeg -i input -acodec libopus -b:a 32k -vbr on -compression_level 10 output
</code>