I have a Canon VIXIA HF200 which produces .mts files. I transfer footage to my computer via the USB cable, and when I want to edit for Youtube and the like, I use Sony Vegas Pro 8. The problem is: I have a Quad Core CPU and an NVIDIA Geforce GTX 280 video card, and I STILL experience lagginess, and most importantly, errors, when working with my Canon's AVCHD footage on Sony Vegas Pro 8. If I have 2-3 files I can usually edit and then render, BUT if I have 5+ clips imported and edited, there's a high risk of an error occurring (the one I get is "An exception has occurred"). It doesn't matter if I save my project frequently because if I open it up I keep getting fatal errors.
I continue to get errors when working with many clips of AVCHD (.mts) files on SVP 8. I want to be able to import as many clips as I want and edit as much as I want without having to worry about the program crashing. What gives? Do I have a dysfunctional copy of the program?