[MacDV] Dual layer disks 3 hour DVDs

[Gerhard]

According to the Apple site it is possible to make 3 hour DVDs with a 
dual layer drive and iDVD.  Quoted straight from their site:

Gerhard

http://www.apple.com/ca/powermac/

Double-layer Drive

The 16x SuperDrive built into every dual-processor Power Mac G5 now 
supports double-layer (DVD+R DL) discs. While single-layer DVD-R discs 
hold up to 4.7GB of data, double-layer discs have two layers of data, 
allowing the SuperDrive laser to read and write on either layer, almost 
doubling the storage to 8.5GB. Using iDVD — included on every Power Mac 
G5 — or DVD Studio Pro, you can author discs with over three hours of 
MPEG-2 video on one DVD+R DL disc. If you work with high-definition 
video, use the SuperDrive to burn double-layer discs with more room for 
high-bit-rate H.264 video.