At the suggestion of some of the experts on this site, I installed the CoreAVC decoder. And I have to say I absolutely loved it. It worked perfectly, silky smooth on MPC even running MTS files, and great on MP4.
A few days ago, it slowed way down. It can still handle simple things, but anything with a lot of movement will cause it to start stuttering.
My question is, how do I go about finding what caused the problem? The only things I installed in the interim were Lightroom and whatever crap a friends Flip puts on your PC (which I have since banished but the damage was done). Does anyone have any suggestions, or a link to a website with suggestions, on how to determine the problem and ideally the steps to fixing it. Is it a codec issue, and if so how do I find the bad codec and what codecs are necessary? etc.
I have tried uninstalling and reinstalling the following already: Lightroom, Quicktime and CoreAVC. I cant find the Flip stuff (it crashed halfway in) to uninstall it.
I know Im a total babe in the woods here, any points though to places I can educate myself and get up to speed (so I can at least ask intelligent questions) would be much appreciated.