Why does it say they are unsupported on my wintv7, but i can still check the box?
Oooh I see, yes THAT kind of support.
Can it record in h264 if I tell it to? I thought it could only do mpeg2?
the codec that wintv uses by default should be fine. about editing MPEG-2 files in virtualdub, probably not the best idea...try womble mpeg dvd editor. can direct-stream cut files like vdub does.
the audio might be out of sync because vdub is probably using an alternate decoder (via DirectShow, perhaps with the Halii Splitter), whereas wintv uses its own codec for decoding.