>Is there a class that parse audio stream from mpeg-4 file No, there is not yet support for demultiplexing raw MPEG-4 audio (and/or video) from a MPEG-4 (i.e., ".mp4"-format) file. If anyone is interested in paying for LIVE.COM to implement this, then please let me know (by separate email). Ross Finlayson LIVE.COM <http://www.live.com/>