Knud Larson

I am constructing a reasonably complex jitter patch processing live HD video. It's working, except that my frame rate is very low (8-10 fps, which won't do). Tinkering with the patch I discovered the culprit was the jit.brcosa object: take it out and the framerate doubles. Only problem is: I need it. I've been trying to make a series of jit.op objects to replace it (which seems to be much lighter on my processor; fps stays high) but I can't quite get the same effect. I am wondering if there is a jitter expert out there who can advise me. I am using the jit.brcosa object for two things:

1. I make a 'posterized' negative image by pushing contrast to -4.

2. I sometimes make the image black and white by pushing saturation to 0 (I know, that's clunky, but it works).

Anyone know how to do this with jit.op (or any other jitter object)? I can do the negative, but I can't seem to get the contrast.

I tried jit.rgb2luma for the desaturation, but it crashes the patch if I interpolate the final jit.window, which i like to do.

Anyone know why the jit.brcosa object is slowing me down so much?

ps. the final patch will run on a new i5 Macmini (which I haven't been able to test yet), but I'm building it on a 2008 MacPro with 2 x 2.66 GHz Dual-Core Intel Xeon processor and 8 GB of memory. I checked out the patch's performance on a new i7 Macbook Pro and the frame rate doubles to 15-17 fps.

I am constructing a reasonably complex jitter patch processing live HD video. It's working, except that my frame rate is very low (8-10 fps, which won't do). Tinkering with the patch I discovered the culprit was the jit.brcosa object: take it out and the framerate doubles. Only problem is: I need it. I've been trying to make a series of jit.op objects to replace it (which seems to be much lighter on my processor; fps stays high) but I can't quite get the same effect. I am wondering if there is a jitter expert out there who can advise me. I am using the jit.brcosa object for two things:
1. I make a 'posterized' negative image by pushing contrast to -4.
2. I sometimes make the image black and white by pushing saturation to 0 (I know, that's clunky, but it works).
Anyone know how to do this with jit.op (or any other jitter object)? I can do the negative, but I can't seem to get the contrast.
I tried jit.rgb2luma for the desaturation, but it crashes the patch if I interpolate the final jit.window, which i like to do.
Anyone know why the jit.brcosa object is slowing me down so much?
Any other suggestions?
I'm all ears
Thanks
Knud
ps. the final patch will run on a new i5 Macmini (which I haven't been able to test yet), but I'm building it on a 2008 MacPro with 2 x 2.66 GHz Dual-Core Intel Xeon processor and 8 GB of memory. I checked out the patch's performance on a new i7 Macbook Pro and the frame rate doubles to 15-17 fps.


jit-brcosa

try getting into gl land...shaders might be your friend in this case...in your examples folder there are examples for different color effects. There is not a specific example one for brcosa, but you should be able to figure out the right thing.

Go to examples-> jitter examples -> render -> slab helpers -> colors to find some of the pertinent ones

try getting into gl land...shaders might be your friend in this case...in your examples folder there are examples for different color effects. There is not a specific example one for brcosa, but you should be able to figure out the right thing. 

Go to examples-> jitter examples -> render -> slab helpers -> colors to find some of the pertinent ones


GL does have a brcosa: Much better! I'm up to 15 fps (on my old machine) and the video looks super crisp by comparison to what I had before. Beautiful.

You're a genius Laserpilot. Thanks. I can go to bed now.

Yes!
GL does have a brcosa: Much better! I'm up to 15 fps (on my old machine) and the video looks super crisp by comparison to what I had before. Beautiful.
You're a genius Laserpilot. Thanks. I can go to bed now.
At last!
