MPEG4 Video playback is jumping and generally poor

Hey all,
I've got a couple videos that are already converted to MPEG4 (.mp4) that play absolutely fine in quicktime 7.1.3 but when i try to play them in itunes i get jumpy sketchy playback, it's unbearable to watch!
The problem definately isn't hardware as i run a G4 1.67ghz machine with 2GB of RAM. I've got nothing else open and besides as I said it runs fine in quicktime.
Does anyone know any tricks to get around this?
15 Powerbook G4 1.67 Superdrive 2GB 128MB Mac OS X (10.4.8)

Followup:
If i convert to H.264 using convert for ipod in iTunes i can play the files no problem but that shouldn't be necessary as mp4 is supposed to be supported.
It would litteraly take years to convert all the stuff i have over to H.264, really keen to mp4 working in itunes.

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