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jit.qt.movie fps attribute not modifiable, crashes Max if attrui made

January 23, 2013 | 2:53 am

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:

– Pasted Max Patch, click to expand. –

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…

thanks, Arvid


February 15, 2013 | 8:34 am

Adjust the playback rate using the rate message. Eg rate 0.5 will play at half speed and rate 2 will play at double speed.


February 15, 2013 | 3:37 pm

Thanks. That’s the first thing I tried. But that doesn’t change the FPS of the movie when its exported to a file, which is what I really want. My current workaround is to have rate adjustment for playback preview and then when the export or save button is clicked, I adjust the duration and timescale values of the movie to fit the frame rate I want (new duration = duration/rate, new timescale = timescale*rate), do the export, then change them back (because more frames may be appended to the movie after an export). Sort of annoying, but it seems to work. Especially since Max won’t let me change the global movie timescale (timescale not recognized as a settable attribute), and I need to do it for every track in the quicktime movie with tracktimescale. In this case, I know that the movies i am creating have only one track, so its not a big deal – i just change the timescale on track 1 and that seems to work.


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