AC3 input into TMPGEnc

[1576]

This used to work fine for me. I'd save a project in DVD2AVI then just put the d2v in the video input, and the AC3 stream as the audio input. Never had any problems with synch, and everything was cool.
Now, it wont accept the ac3 stream at all, saying it's unsupported, and Im having to convert it to wav.
What has gone wrong, and more importantly, how do I get the facility back? Is there a filter I need to install somewhere??
Would be grateful if someone could help, it's driving me nuts.

[Faceman101]

try doom9.net's audio filters package. once installed i had no problem with AC3 in TMPGEnc.