What's the best way to create this kind of file?

Hi There,
I have a JVC camcorder (model # GR-D200U) that can create mpeg-4 ASF
files and my DVD unit has no problem playing them back. I have successfully created a couple ASF files using Windows Media Encoder and renaming the extension to ASF and it works but can't get audio. I'm wondering if it would be possible to encode with xvid simple profile and somehow mux that with G.726 audio into the ASF container?

Celtic_D in many forums suggest FFMPEG can output to ASF and i'm going to try it out. Does anybody know of any guides for this?

Any suggestions is appreciated. Thanks!