[jitter] I need help, I can not find where is the problem with my patch (jit.gl.videoplane, jit.gl.slab)

You can't see anything in the pwindows because jit.gl.videoplane  
doesn't output a matrix unless you tell it to.

Your patch is really big. To figure out why it doesn't work they way  
you want it to, strip out as much as possible, see if the stripped- 
down version does what you want, then build it back up piece by  
piece, testing as you go.  Also, use only one qmetro and throttle its  
bangs with [qlim] as needed, and remove all the updating numberboxes  
-- they'll slow your patch waaay down.

If I understand whatever you're after, I think you're going to need  
to render your GL objects (the videoplanes) to textures before you  
composite them, e.g.,

send movie to [videoplane @automatic 0]
move it (many times), bang it (thus telling the render to draw it)
render to texture (look in the example patches for this)
send 'erase' to the render
repeat the steps above for your next movie/plane,
route your textures to slabs to composite them,
send the result to another [jit.gl.videoplane @transform_reset 2],
finally bang jit.gl.render to draw your composited result.

good luck!

dan