Weird blinking and updating display

Hello,
After connected for the first time my iBook to another display (mirroring), the LSD display of the computer has been experienced a weird behaviour, every 4 or 5 minutes it is blinking and somehow making something like a desktop update and if I am using any application, it will become freeze and the desktop will become as the main position.
So, please if somebody has any idea about it, please help me.
Thanks,

GrowthE wrote:
The format is .MOV, straight from Canon 600D, so I guess no codec?
A format is just a container for a video encoded with a codec. All video, as Rick says, has a codec. Most DSLR's use an h.264 variant as their codec. The problem with that codec for certain things is that it uses interframe compression. I could get into a long explanation of this, but the short version is that it doesn't have full information for every frame. That sort of thing can sometimes get screwy in AE which uses full-frame information for every frame. This was much more of an issue in earlier versions of AE, but from CS5 onward, things are much improved. However, with multiprocessing on, sometimes you can see weirdness with these highly-compressed interframe codecs. That's why Rick is suggesting you try turning that off and clearing your cache.

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