convert mp3 to opus The short solution find ./ -type f -name '*.mp3' -exec sh -c 'ffmpeg -i "{}" -f wav - | opusenc --music - "{}.opus"' \; The full journey to the solution The first trick was just to use ffmpeg to convert to .wav, and then to take that .wav output and feed it to opusenc1 ffmpeg -i input.mp3 -f wav - | opusenc –bitrate 256 - output.opus