Hello All,

I was thinking about using movies rather than jpegs to store my 800 odd image files, but I've just remembered I'm using pix_mask to make the text nice and antialiased.

So I did a few trials using pix_film and pix_mask. It does not seem to work at all, is it supposed to? This is on the standard gem-0.87 distro. I can load movies into pix_film attached to pix_mask but the masking is not rendered, and when I change frame I get the message:

error: Gem: pix object cannot handle gray image

Its not clean which pix object is creating this message, and neither movie is grey!!! (I tried with my own movies and the mov that comes with gem) I'm using the very same patch I used to set up the alpha using jpegs so alpha and all the other stuff one needs is there. This functionality is in the cvs gem?

Thanks Ben

----- Original Message ----- From: guenter geiger geiger@xdv.org Date: Saturday, December 7, 2002 11:08 am Subject: Re: [PD] Gem -0.87 Performance Tuning (disk IO)

Hi Ben,

you might try to convert the image into a movie. This could be done on Linux with ffmpeg for example.

On the Gem side image loading could be put into a

additional

thread to prevent such problems.

Guenter

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On Sat, 7 Dec 2002 bbogart@ryerson.ca wrote:

...

Hello All,

I'm working on the implimentation of my thesis project in pd/Gem and have run into some performance issues (in linux using -rt).

I have 4 video clips (Photo JPEG 256x256 quicktimes from 3000-11000 frames) and about 800 128x512 jpeg stills.

any two of the 4 video clips are playing at any one time, and being mixed using alpha. Three of the jpegs are being used at any one time. The jpegs are chosen by the output of some chaos

math.

...

The video stuff playes great on its own, and the stills come up great too, animation is smooth and nice (Geforce2 MX-400)

The problem is that when I load a new set of jpegs the video playback freezes for about 500ms and then continues. It looks like its the disk access causing the issue, since the videos are being played off disk. I tried putting the videos on a different HD than the images, but there is still that pause.

Anyone have any suggestions on what I could do to improve the performance? This is an installation and as such needs to run for days on end without a performance drop.

In my tests using the images without the video I could open a new jpeg every 80ms or so, very impressive. But why the video render pause? I thought about using pix_multiimage, but 800 128x512 tiffs is probably too much for my 640MB of RAM.

Any suggestions would be appreciated.

Thanks Ben

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