# Converts an input-video file to a 256k 44100Hz mp3 file.
ffmpeg -i input-video.wav -vn -ar 44100 -ac 2 -ab 256k -f mp3 output-file.mp3
# Converts an input-video file to a 256k 44100Hz mp3 file.
ffmpeg -i input-video.wav -vn -ar 44100 -ac 2 -ab 256k -f mp3 output-file.mp3