I have downloaded a Divx video with AC-3. I want to burn it in my DVD and i have convert the video to mpg2 without problem.

But since i think the audio is in AC-3 it will be easy to use it in any DVD authoring application. I have tried in a friend computer with sonic foundry and it says:

File: C:\Archivos de programa\eDonkey2000\incoming\audio.ac3
File size: 0 bytes
AC-3 File type: SMPTE time code (0x00)
Total frames: 0
Frame size: 0 bytes
Sample rate: 0 Hz
Data rate: 0 kbps
Audio coding mode: 1+1 (L, R)
Bit stream mode: Main audio service: Complete main
Dialog normalization: Reserved
Center mix: -3 dB
Surround mix: -3 dB
Copyright: Off
Original: Off
Start time: 00:00:0,00
End time: 00:00:0,00
Status: Frame 1
Unknown frame type

Obviously no DVD author solution handle this archive....