Most folks recommend not having the video data rate exceed 7.5 – 7.7 Mbps, particularly, if you’re using aiff audio which runs at 1.5 Mbps. You have a bit more leeway if you convert your audio to ac3 at 192 Kbps. However, if you push up the data rate too much, many DVD players will choke. I rarely exceed 6.5 Mbps for video and always use ac3. Stwphen’s absolutely right about Compressor being faster. On our 8-core machine, we encode mv2 and ac3 at slightly faster than real time. You do, however, have to setup Qmaster to achieve speed gains thru multiple cores.
John
MacPro 8-core 2.8GHz 8 GB RAM OS 10.5.8 QT7.6.4 Kona 3 Dual Cinema 23 ATI Radeon HD 3870, 24″ TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCS 3 (FCP 7.0.2, Motion 4.0.2, Comp 3.5.2, DVDSP 4.2.2, Color 1.5.2)
Pro Tools HD w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec Monitors, PrimaLT ISDN