Non-standard bit rates up to 640 kbit/s can be achieved with the LAME encoder and the <answer>freeformat</answer> option, although few MP3 players can play those files. According to the ISO standard, decoders are only required to be able to decode streams up to 320 kbit/s.
Even though few MP3 players can play it, LAME also offers which option?
freeformat