QT Export to H.264 Files Crashing FireFox and my Mac Pro

I'm trying to create videos viewable on Apple mobile devices. Using QT Player 10 (114), I did an export and got the m4v file and support other files and the movie works fine on the mobile devices plus Safari. But FireFox crashes HARD, and I can't Force Quit as my Mac Pro is even crashed. I tried again. Crashed again.
Then I tried using QT Player 7 Pro which on export creates a bit more code and parameters, and again Apple devices and Safari work fine, but FF and my Mac crash hard.
I have to hard quit my computer in after trying to open the exported files from QT. Has anyone had this same experience or any advice how to fix this?
Yes, I exported for both iPhone and Computer.
QuickTimeKirk are you around? Have any input? Help!
Thanks,
Steven

I use the same intial settings as I see in the Apple ads Hollywood movies. But get much higher file sizes. What is the trick to getting the same quality and small file size I see in the QT and Apple ads?
Many factors are involved here. Try reading the following document which covers many of the elementary basics.
http://www.apple.com/quicktime/tutorials/h264.html
Once you master these techniques, you can then move on to more advanced strategies which optimize encoding based on changes in the actual scene content (e.g., complexity of motion vectors, lighting, application of editing effects/filters, etc.) and manually keyed into the project by the user. Afraid others would have to help you here as this is beyond my current level of expertise.

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