Hi Nick, Previously I was using DVDSPro to encode the assets on build but that was just too flaky so in the end I have been using compressor to make the m2v files then place them into my project. The build is much faster now of course but now I'm thinking that maybe I should do my slideshows in FCPro also... perhaps less room for error. In my bit-budgeting I calculated the video should be approx 5.3mbps but as my other email to the list says, I'm rather confused about how much space DVDSPro sees on a DL disc and how it manages sizes as you get closer and closer to a formatted disc. Just as a test, I took my successful 7.9GB build folder (that the DVDSPro build log said was too big by 35MB) and tried to use ToastLite to burn the VIDEO_TS folder as a data disc but it failed with buffer underrun with 20mins left (possibly half way). I think I had tried this ages ago with this project and it failed with the same time remaining then too (expensive failures at $10 a pop). Could it be that the burner isn't getting any layer change info and is failing half way through the burn. I would have thought as a data disc it wouldn't matter what I was burning that Toast should be able to make the layer change for me. Cheers, Coj Nick Scalise <nickscalise at cox.net> Sent by: macdv-bounces at listserver.themacintoshguy.com 11/02/06 01:46 AM Please respond to "A place to discuss digital video on Macintosh." <macdv at listserver.themacintoshguy.com> To "A place to discuss digital video on Macintosh." <macdv at listserver.themacintoshguy.com> cc Subject Re: [MacDV] Fw: Internal Muxer Error - DVDSPro 4 Just guessing here, but have you tried pre-compressing the files using Compressor first? Or is it too complex for that?