Forums > Jitter

Maximum number of movie or videoplanes…


pm
February 9, 2009 | 7:42 pm

Hi there,
I have a video patch in which there is a certain number of movie_reader, an object of mine made of a jit.qt.movie (with the uyvy gl transfer…), some jit.gl.slab and a jit.gl.videoplane.

I followed the prescriptions from Vade to optimize movie playing, everything was working fine, thanks to him. When I use 5 movie readers, my fps is at 60, which is the best I can get.

But if I use more than 5 movie_reader(8 for example), which means 8 jit.qt.movie and 8 jit.gl.videoplane, my fps drops to 30. 6, 7 or 8 movie_reader give the same result in term of fps…

I use multiple videoplanes, because it seems to be the best way (with color 0. 0. 0. $1) to do some simple compositing with many movies.

Anybody has a clue to explain the frame drop??? So, is there a maximum of jit.gl.videoplane?

Or would there be a better way to composite (add) up to 8 movies?

Thanks a lot.

Ps. I can’t post the patch here, because it is a very complex patch, in which commands are sent by a text editor, with many files attached to it. I hope, some of you will be able to help me without seeing all the patch cords…


February 9, 2009 | 11:37 pm

could this be some kind of hard drive/file reading limitation? thats a lot of files to access at once from one spinning disk..what if you try and grab half off of an external and half off internal or something..i have no idea but ive been wondering about this myself lately and that is one of the main obstacles i could see



pm
February 10, 2009 | 12:48 am

I don’t think it is a matter of disk usage… since the only file that is played at startup is a jpeg that is all black. Also the jit.qt.movie is @unique 1, so it should only read it once, or maybe I misunderstood…


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