How to Create a Diagonal Split Screen:

Import three videos and stack them on top of each other in your timeline. Go to the effects browser and apply the “Offset” effect to all three videos.

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Go back to your effects browser and type “image matte” and select the “Image Matte Key.” Apply that filter to all three clips as well.

Now select the video on track three and go to the effect controls. Change the composite using under the Image Matte Key settings from “Matte Alpha” to “Matte Luma.”

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Next, you must download the diagonal matte .png files. Here is a safe link where you can download them (http://www.mediafire.com/?l5wkyg2x8yh9o1g).

Click on the “Setup…” button next to the Image Matte Key effect and locate the file you have just downloaded and select the Diagonal Left.png file and click on it to apply it to this layer.

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Use the “Offset” function to adjust the frame to show exactly what you want to see.

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Repeat this step for the other two clips. For the clip on track 2, use the Diagonal Center.png Matte and for the clip on track 1, use the Diagonal Right.png Matte. Once again remembering to offset the videos to show exactly what you want.

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Once you have applied your mattes to each track, it is time to animate each track.

On track 3 set a keyframe for the initial position then scan over 15 frames and set another keyframe. Go back to the first keyframe and slide the frame off screen in a left diagonal motion and readd the keyframe. This will allow the video track to slide down from outside the left frame.

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Now we can animate the other two videos to slide in. Select the second track and scan in 15 frames from the clips endpoint and add a keyframe, then scan over another 15 frames and set another keyframe. Go back to the first keyframe and slide the frame off screen in a left diagonal motion and readd the keyframe. Try not to overlap this track with the left or right ones.

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Finally, we can animate the last video. Select track one and scan in 30 frames from the clips end point and add a keyframe, then scan over another 15 frames and set another keyframe. Go back to the first keyframe and slide the frame off screen in a left diagonal motion and readd the keyframe. Try not to overlap this track with the center one.

Press enter to render your clips and you should now have a nice cascading diagonal split screen! 

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