I am making a demo video and I'm using material from past projects. Instead of recapturing my raw footage, is there a program (preferably free if possible) that can rip a portion of my dvd so I can use it in DVDA without recompressing?
yes, but I just want a section of the video, and that would require me to recompress the footage. I decided to take the time and recapture the original footage again.
Womble.com has two programs that do exactly what you want. There are others as well but the programs there, MPEG Edit and MPEG VCR, are my own personal favorites. They will do exactly what you want and the edited mpegs can be written to dvd by DVD architect. You can even add titles and transitions. I wouldn't go too wild with this approach because the GOP structure gets a little out of sequence, but with just an edit or two, your DVD player will never know the difference;-)
TMPGEnc is semi-free and can cut MPEG-2 without loss, but doesn't do AC-3 (I don't think). Womble does it all. I haven't used VideoRedo, but lots of people like it (VideoRedo.
I do exactly what you want to do, and I do it all the time to create compilations from DVDs I've previously created. I use Womble.
Vegas and DVDA cannot do this by themselves, despite my asking Sony for this feature for over two years.
The workflow is to drag the VOB file(s) onto the Womble MPEG Edit timeline and render to the mpeg 2 to reauthor in Vegas. MPEG VCR has a demux tool that will separate the AC3 audio file from the video. You do have to rename the demuxed audio with a .ac3 extension though. If you skip this step it's not that big a deal. DVD Architect will just rerender the audio. I usually demux it to avoid this render even though I've never heard any damage from the extra audio render.