MacBook Pro shuts off during video conversion/heavy CPU usage

I'm not quite sure how to troubleshoot this, and I'm curious if anyone has experienced this, or has any suggestions.
Whenever I do a video conversion, about 10 minutes in, my MacBook Pro just shuts off. Some examples of the kind of video conversions I'm doing are, exporting an EyeTV recording to iTunes, or converting a video already in iTunes to AppleTV or iPod/iPhone. Both of these examples are using Quicktime, I'm assuming?
I did a clean reinstall of Tiger, and the problem was still there. And, after upgrading to Leopard, the problem is still there.
Any suggestions?
Thanks!

Could be due to overheating. Install iStat Menus, show CPU use, CPU temp, and fan speed in the menu bar, and start converting. If CPU use is pegged, fans are at 6000 rpm, and temp rises to/above 90 C, then your MBP shuts off, that's the issue.
There are some early models of MBPs that had too much thermal paste, leading to excessive heat build up.

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MacBook Pro shuts off during video conversion/heavy CPU usage

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