Anything that normally requires raw level hardware access (like DVD ripping/CD audio ripping) will not function properly under DVDShrink, EAC, etc etc. It just won't work properly because of the need to use virtualization drivers to get the devices working
at all.
If you're wondering about DVD ripping, use Mac The Ripper and rip the DVD contents to the hard drive into a shared folder with XP (under Parallels, this is easy to assign shared folders that both OSes can use together). After the content is on the drive inside the shared folder, fire up XP if it's not already running, fire up DVDShrink or whatever program you're using, load the content, specify an output location (not the XP drive since it's typically small unless you dedicate a HUGE amount of space to it which is really impractical), then let it rip.
You'll end up with the resulting compressed content ready for burning with whatever OSX burning app you like.
Hope this helps...
bb
ps
I'm currently staring at dual 20" LCDs: on the left is the iMac itself, running OSX. On the right is XP running full screen at about 98% of native speed. It works flawlessly, and for DVD crunching duties, I use Mac The Ripper to rip, then DVD2OneX (DETOX) under OSX because my Wife has a 20" iMac also and I use DETOX's built-in ability to work
with the power of her Core 2 Duo processor
as well as mine at the same time. It's distributed DVD compression, and it's a lot faster than just my machine alone. Hers works as a slave device to mine, and I can compress a DVD9 down to DVD5 in under 10 minutes, most of the time much faster than that. Only works for content already on the hard drive however, so the time ripping with Mac The Ripper has to be factored in.
I just made a backup of Smallville Season 1 Disc 1, the content is about 7.65GB in size. It took 8 minutes and 16 seconds to crunch that down to DVD5 format, with everything included (I never remaster the content, that defeats the purpose of backing up the DVDs, right?), so I'm damned happy with how my dual Core 2 Duo iMacs are working.
8.64 GHz of distributed DVD crunching power... gotta love it
pss
Ripping the DVD content to the hard drive with Mac The Ripper 3.0r13e took about 41 minutes with my Plextor 18x Firewire enclosure drive... wish that aspect was faster, but from what I've read across different forums is that Plextor has their drives firmware locked to a max of 12x DVD ripping speeds. Bleh... if anyone knows a workaround, let me know will ya...