Select the heading "Masks" and copy it (Ctrl +C). Toggle open the video layer and you will see Masks listed. Use the pen tool and draw a wide thin box just above the top of the keyboard - this is the area that the particles will appear from.
In Precomp 2 turn on the eyeball switch beside the video - the video will reappear. You need to copy/paste the mask onto the solid, and turn off the eye icon on the video layer - as per instructions: Then in Precomp2 you need to mask the keyboard out entirely (including the yellow line) and make the mask thinner and even. This will leave you with only green bars on a transparent background. Toggle the box open and select Alpha Inverted Matte. You should see a TrkMat pulldown box beside the pickwhip symbol - if not press the Toggle Switches/Modes button at the very bottom of the screen and it should appear. It looks like you haven't set the Track Matte up (in either comp?) as per instructions: I've no idea how you have ended up with Precomp 2 looking like that? At the top of this page dlui862 has three screen shots, the final one is what Precomp 2 should look like. * make sure that you don't have any part of the keyboard within the mask, even the smallest bit will cause extra particles to emit from it.
You should now have little green balls coming out from the green bars when they reach the keyboard - now is the time to work on the actual particles to get them to look like you want. In emitter settings: Particles/sec very high (say 100,000?) Emitter Type - Layer Layer Emitter - Precomp: Layer Sampling - Particle Birth Time.
Precomp (turn off the eyeball - make it 3D) Now, in your Main comp: make a solid and add Particular to it. Turn off the eyeball for the video layer and you should have a thin slit which the green bars will move through with a transparent background. Select the Green Solid layer and paste the mask (Ctrl + V). Use the pen tool and draw a wide thin box just above the top of the keyboard - this is the area that the particles will appear from*. Turn on the eyeball switch beside the video - the video will reappear. Add a new solid and make it the same green as the bars (use the eyedropper tool and sample the green from the Keylight swatch). You should see a checkerboard pattern where the green used to be which shows that it is transparent. In Precomp add the Keylight Effect and key out the green bars (toggle the Transparency Grid on at the bottom of the screen, it's the checkerboard symbol next to Active Camera). In your main comp have your video, duplicate it (Ctrl +D) and Precompose the top layer - call it Precomp Here is a simpler way that will render much faster: The original poster needed to have the particles come from behind the bars, which makes the process far, far more complicated and is probably unnecessary.
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