jit.qt.movie's fps attribute is not modifiable in the inspector or by sending a message. It responds to a getfps message (which is not in the documentation or object inlet menu, BTW) with the correct value. If you use the inspector to tell max to make an attrui for fps, Max crashes.
Here's an example patch:
Is this a bug?
If not, what's the best way to adjust a movie's fps - so that when I save a copy of it that fps is maintained? the rate attribute is not saved in to the quicktime movie - its only a Jitter playback attribute. I bet i can work something out using getduration getframecount and scale commands, but it seems like there should be a simpler way…