I have several movies that I have downloaded off Sharereactor. When encoding them with TMPGEnc 2.54, the audio source does not fill in when I choose the Video source. I have tried using Virtual Dub and saving as an AC3 file and then pulling it in, but I still get 'can not open' or unsupported. How can I get around this? Here is the file information:

Frame Size: 640 x 272
Decompressor: DivX, MPEG-4 Low motion
Sampling rate: 48000 HZ
Compression: Unknown

Some of the movies include:
K19
XXX
Insomnia
Ted Bundy
The Bone Collector

Any help would be most appreciated!