PID or Process Identification is assigned to everything running on your UNIX (OSX) machine. One of the ways to halt a run-away program if it doesn't respond to the mouse is to open a terminal and kill the process ID manually. Most Mac people will hate this, but it does work and it's one of the uses of the PID.
The only way
you would ever get a PID error is if you found something very wrong on your machine. The fact that it happens in DVDSP I think isn't important. This is a system-level error.
Unless, of course, you have a "borrowed" version of DVDSP.......
If we assume it's real, I wouid run, do not walk to where you put your OSX System Install CD, start the machine from it, (hold C while starting) and run Disk Utilities, Repair Disk and Repair Permissions on the System Hard Drive. I bet the repair process finds errors.
Then restart the machine normally.
Koz