Wierd pixel ghosting

I'm having a problem which is driving me crazy. I thought I'd see something about it on the board but no luck.
Two problems actually, dont know if they're related.
First, less of a problem, I'm working in animation codec, anytime I render a file the timeline grinds to a near halt. Also, if I do a QT export, the files are very slow in QT player. Strange thing is that the source files I'm working from are also animation codec and play fine, both on the timeline and in QT player. Tried every possible sequence setting variation, but no success in working this out.
More of a problem, especially because I'm on a tight deadline, on some material, when I composite it in after effects and render, a few spots have a pixelated motion trail for a second or two. Its not coming from after effects though. When I open a QT export from Final Cut, it plays normally, but when I scrub it in the QT player, I can see the problem. So it doesnt show up when I play it, but its there when I scrub the frames, but when it returns from after effects it is visible when I play the footage. The source footage I'm working with does not have the problem when I scrub in the QT player. I thought it must be something with the client-supplied files, but then I got the pixel trail with a segment I ripped from the client's DVD.
Footage is all SD in animation codec from a variety of sources, mostly DV and betacam captures. I'm using a G5 dual 1.8, not the fastest comp in the world but I've never seen this. Only thing we recently did was upgrade from FCP 4.5 to 5.1.2. I thought it might be a hard drive corrupting the footage but have tried working from different drives, same problem.
Thanks for reading the long post. Any ideas? I really dont want to downgrade FCP but I have to get this done.
Michael

Welcome to the family. You can search for ANIMATION CODEC and find lots of discussion. Most of our Macntoshes aren't powerful enough to process Animation in real time without some hardware support so, yes, it will slog your preview processing the alpha. Can't be helped in the current software unless you got a proprietary codec that supports alpha.
Footage is all SD in animation codec from a variety of sources, mostly DV and betacam captures. < </div>
If you've transcoded or rendered to Animation, it doesn't matter what your source was, they're all the same now. There's not reason to use ANimation for non-alpha material.
I thought it might be a hard drive corrupting the footage but have tried working from different drives, same problem.
<
We used to see glitches and sparklies on some material back in the SCSI drive days. These artifacts were always traced to bad SCSI cables, connections, termination, or other problems in the SCSI path so that's my first suspicion in Firewire setups, too: bad hardware.
If the glitches are in the exact same frame every time, it's bad source media. Test render just that area of the timeline and turn off one layer at a time till it goes away. You will need to recapture or reimport that piece. If the glitches are in different places each render, it's a much more complex problem with a binary search pattern that can take days to run.
bogiesan

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