Why can my 700MB CD-R hold 763 or more MB in MPEG format?

[Findedeux]

I have been testing how much my CD-R's can go over the 700 MB threshhold, and have been surprised that they far surpass that threshhold when burning MPEG (already up to 763). This is great, because I can up the bitrate,etc, but what accounts for this? I am using TDK 80 minute, 700MB CD-Rs, and the normal variation of megabytes for other burning is at most 3 MBs. Is the real megabyte limit larger when burning MPEG, or can a VCD program use some type of algorith to compress the information even more? Thanks for any comments.

[gll99]

mpeg video is written in mode 2 on the cd with less error checking. That is why you can fit approx 800mb on an 80 minute cd but only 700mb for data (including avi video).

The idea is that the DVD/VCD player will skip over the bad video info (if there is some) and keep playing and not stall on the bad video data, it just skips over it.