Regarding the 1st sample: putting the croma issue aside, the result video *is* smooth in motion. Well, basically. Two contra points:
a) It's a 50fps video. When you watch it on a standard PC display set @60Hz, then every 5th frame gets doubled during playback (to fit 50 pictures/second into 60 pictures/second), hence there is a 60/10 = "6 Hz judder" in the playback. Set the display to 50Hz refresh rate to avoid this.
b) the camera pan is not perfectly smooth to start with ... handheld camera, varying muscle tonus, motion-boundaries in the hinges ... you're human, not a machine.
(Edit)
In any case, there is no particular problem regarding QTGMC. It would be good practice to sort this out in a new thread, since it's off-topic for this one.
