andrewlloydgoodman@gmail.com

I've just started working with Jitter a couple of weeks ago and hope to use it for an upcoming project. I am trying to create an interactive video piece in which one layer of video can be "erased" to reveal another layer of video. Right now I'm just trying to develop using a USB track pad as the input.

Anyway, I am having some difficulty trying to figure out exactly how to get the mouse data (in this case the track pad) to modify the video clip. As far as I can tell its a matter of getting the x and y coordinates to be associated with a change in alpha (resulting in an "erasing" effect). However, I can't quite seem to figure out how to translate the mouse tracking data into a modification of the layer 0 (alpha layer) cell data.

I've browsed through the tutorials (having completed the first ten or so already) and while there have been some promising leads, I just can't seem to get all the pieces to fit together. Ideally I'd love to come up with something that functions like the LCD object except that it modifies and existing image/movie (ie manipulating the movie by "drawing" on top of it directly.

Any help that you guys can offer would be greatly appreciated.

I've just started working with Jitter a couple of weeks ago and hope to use it for an upcoming project. I am trying to create an interactive video piece in which one layer of video can be "erased" to reveal another layer of video. Right now I'm just trying to develop using a USB track pad as the input. 

Anyway, I am having some difficulty trying to figure out exactly how to get the mouse data (in this case the track pad) to modify the video clip. As far as I can tell its a matter of getting the x and y coordinates to be associated with a change in alpha (resulting in an "erasing" effect).  However, I can't quite seem to figure out how to translate the mouse tracking data into a modification of the layer 0 (alpha layer) cell data.

newb-question-manipulating-a-movie-using-mouse-movement-data

you can use jit.lcd to draw out a new alpha channel, and then 'pack' 

in the new alpha channel with jit.unpack and jit.pack. Just one off of 

add some blurring in there, or whatnot, or use lcd shapes, etc etc :)

note if you want to go with larger movies or higher performance stuff, 

take a look at opengl with jitter, but this should get you going. :)

On Feb 4, 2008, at 12:39 AM, Andrew Goodman wrote:

> I've just started working with Jitter a couple of weeks ago and hope 

> to use it for an upcoming project. I am trying to create an 

> interactive video piece in which one layer of video can be "erased" 

> to reveal another layer of video. Right now I'm just trying to 

> develop using a USB track pad as the input.

> Anyway, I am having some difficulty trying to figure out exactly how 

> to get the mouse data (in this case the track pad) to modify the 

> video clip. As far as I can tell its a matter of getting the x and y 

> coordinates to be associated with a change in alpha (resulting in an 

> "erasing" effect). However, I can't quite seem to figure out how to 

> translate the mouse tracking data into a modification of the layer 0 

> I've browsed through the tutorials (having completed the first ten 

> or so already) and while there have been some promising leads, I 

> just can't seem to get all the pieces to fit together. Ideally I'd 

> love to come up with something that functions like the LCD object 

> except that it modifies and existing image/movie (ie manipulating 

> the movie by "drawing" on top of it directly.

> Any help that you guys can offer would be greatly appreciated.

you can use jit.lcd to draw out a new alpha channel, and then 'pack'  
in the new alpha channel with jit.unpack and jit.pack. Just one off of  
the cuff idea:

note if you want to go with larger movies or higher performance stuff,  
take a look at opengl with jitter, but this should get you going. :)

>
> I've just started working with Jitter a couple of weeks ago and hope  
> to use it for an upcoming project. I am trying to create an  
> interactive video piece in which one layer of video can be "erased"  
> to reveal another layer of video. Right now I'm just trying to  
> develop using a USB track pad as the input.
>
> Anyway, I am having some difficulty trying to figure out exactly how  
> to get the mouse data (in this case the track pad) to modify the  
> video clip. As far as I can tell its a matter of getting the x and y  
> coordinates to be associated with a change in alpha (resulting in an  
> "erasing" effect).  However, I can't quite seem to figure out how to  
> translate the mouse tracking data into a modification of the layer 0  
> (alpha layer) cell data.
>
> I've browsed through the tutorials (having completed the first ten  
> or so already) and while there have been some promising leads, I  
> just can't seem to get all the pieces to fit together. Ideally I'd  
> love to come up with something that functions like the LCD object  
> except that it modifies and existing image/movie (ie manipulating  
> the movie by "drawing" on top of it directly.
>
> Any help that you guys can offer would be greatly appreciated.
>
> Thanks!


I'm very interested of drawing alpha channels so I can see de video behind.

I'm using the patch that was shared in this post, but i can not get it work. I "draw" in the windows but nothing happens.

Is there something that i need to know besides this post so I can get the patch work?

Hello
I'm very interested of drawing alpha channels so I can see de video behind.
I'm using the patch that was shared in this post, but i can not get it work. I "draw" in the windows but nothing happens.

Newb Question (manipulating a movie using mouse movement data)