HELP! quicktime videos playback jittery: RAM problem?

hi, i'm hoping someone can point me in the right direction - i use veejay software to mix videos live and have this weird problme all of a sudden, where my videos play back jittery. i thought at first it was the software, but i changed software and though it was working fine before, now suddelny the problem has recurred....
i wonder, since the videos get loaded into ram, and play from there instead of the HD, could i have a ram problem?
thx for any help in this!!! i have a gig on the weekend and NEED to fix the problem...
-frank

Can you give some details on your system - What version QT, RAM, free space on HD, etc?
sorry, thought that was in the footer of the message.
iMac G5, 20, 1.8Ghz, 2GB Ram OS 10.4.3
QT 7.0.1 HD has 25GB free, using an external Firewire dr running at 7200rpm.

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HELP! quicktime videos playback jittery: RAM problem?

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