If i am putting a vcd or svcd onto a dvd-r, it can have proper AC3 DD sound. If I Demux the sound from the original mpeg, how do i convert it to AC3 and what DVD authoring software will accept the AC3 file.

Will SpruceUp work?

Also, If I have a Divx with AC3 sound, can I just use vdub to save the sound as a wav & rename it to .AC3 and import this into the DVD authoring s/ware.

cheers