Playback jitter on SMIL with a seq of multiple videos

I notice jitter on the playback via a smil script with a seq of mulitple videos clips. The jitter appear to start on the second and subsequent video clips. The videos clips have the same resolution and bitrate via HTTP Progressive playout. Is there some QT Player settings or SMIL extension I need to set?
P.S. When I play the clip individually, I did not notice any jitter on the playout.

Hi!
I have had - and still seem to have the same problem. QuickTime 7 will start stuttering after the first change, ie. after the first movie. If you pause playback on and off, the current film will play perfectly - until the next change in the playlist. Then the problem reaccurs.
I cured the situation by going back to QT 6.5.2, where everything works just fine... but you have to do without a lot of nice stuff that QT7 has.
Also remember that QuickTime only supports a subset of SMIL, not all commands.
MacMinis, XServe, Dual 867 G4, Dual 2.5 GHz G5   Mac OS X (10.4.2)  

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