DTS to AC3

[kebabinho]

Is there anyway of ripping the DTS sound from and AVI and converting it to AC3, a bit like fmpegui does with MP3 sound?
if not is there a program that will just convert the DTS to AC3 ( i think i can rip the stream using virtualdubmod)?

regards

[setarip]

"is there a program that will just convert the DTS to AC3"

As far as I know, there is no such program...