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Were you able to record the AC3 soundtrack as AC3 in that manner, or was it converted to PCM in the process?
Happily I can record the AC3 stream. I had to buy a separate AC3 decoder off Ebay, originally expecting that I'd be recording six separate analogue channels - but then I found I could convert the RF digital output of my LD player to SPDIF, and use my SPDIF USB box to pass bits straight through to the recording program. I remember making the first recording, then playing it back out through the box and watching my amp display "Dolby Digital 3/2"! Although my laptop has a SPDIF-out of it's own, I couldn't just play it out through that because of all the conversion and addition of other audio sources that ruin the stream.
What you end up with is an audio recording which looks like short bursts of white noise followed by longer runs of silence. If the recording was good, I was able to use a bit of PowerBasic (these days I use C) to put all the AC3 packets together, resulting in an AC3 file that I could decode.
David