Finder hangs on "thumbnail view of video files, relaunches itself

Within the past week I upgraded from 10.4.11 -> 10.6.5 on a 3-year old MBP (Intel). Sometimes when viewing Finder windows with video files everything hangs and I am treated to my favorite sight, the cheerful spinning beanie..... Sometimes when it hangs, Finder relaunches itself taking about 10 seconds to do so. This is mostly a hiccup, since Snow Leopard Finder restores the individual windows with their directory paths. (This happens several times a day, and would be really annoying if relaunch meant resetting everything to User directory level like it did in earlier OS versions.)
Possibly related is on occasional black screen "blink" lasting not more than 2 seconds. This is unsettling.
Related question - does Finder use QuickTime, or some limited implementation of QuickTime, as a resource to display thumbnail video? Could this be a symptom of the utility trying to do too good a job showing video thumbnails (consequently sucking up too many processing resources), which I often don't want to look at anyway?

Update on this issue -
No serious problems except one time the screen went black and wouldn't come back (usually no action is required before the screen refreshes itself.) Lately, I've seen it go black about every 2-3 days with no major interruptions in operation. The obvious question is this: Does this indicate a bigger problem, perhaps with hardware, which will make my computer crash for good in the near future?

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i mean:
the web server (which has ffmpeg installed) do the job for you...
a servlet or anything else do a Runtime.getRuntime()exec("<ffmpeg_command>");when a video arrives on the server, store the video in n formats and create a thumbnail
for the video. search on the web, you can easily find lots of stuff...
or do it yourself with ffmpeg if you have few videos...
Message was edited by:
supareno

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You can right click on your Desktop and select New Folder. In Finder File > New Folder should work too, not in front of my Mac.
Welcome to back by the way. You might find these websites helpful.
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How do I change the thumbnail for a video file?

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Can I change the thumbnail for a video file (ex. .mov) in Bridge CS4?
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post more code
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hiya!
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(have you checked on your DirectX?)
with regard to following up on the drivers issues, this document might also be helpful:
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... if you've got a wireless card, also check on the drivers for that (as well as the sound and video cards).
love, b

Finder hangs on "thumbnail view of video files, relaunches itself

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