No DVD audio in Rifftrax DVD Player

[catch22]

My computer:
- Athlon 64 X2 4400+
- 2GB RAM
- Nvidia GeForce 6150SE nforce 430 (onboard)
- Realtek High Definition Audio (onboard)
- running Windows Vista

My problem:

I downloaded the Rifftrax for the Transformers movie, and the Rifftrax DVD Player.  Once it starts playing, though, the only audio I hear is the rifftrax, no audio from the DVD.  My DVD audio works fine in WMP.

The Rifftrax FAQ just says to try different codecs if you have a problem, but I only have two options available for audio codecs:

- None (System default)
- Microsoft MPEG-1/DD Audio Encoder

Neither of them help.

[MrTorso]

Install AC3 Filter for free at ac3filter.net. Should fix you right up.