Audio
au
supported video / sound formats: http://www.au.kddi.com/ezfactory/tec/spec/4_5.html
QCELP is supported by almost all handsets. Instructions for getting FFMPEG working with QCELP
SoftBank
- 3gp is supported with the codec AMR-NB and a mime type of audio/3gpp
Transcoding
AudioTrans is an on-the-fly transcoder for audio targeted at Japanese handsets.
Markup
au and SoftBank support the bgsound tag, which allows you to play audio in the background
