Cropping out split-screen
After Effects | Sony vegas | Adobe Premiere
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Source Video
Open Sony Vegas, Add your video to the timeline. Right click it and select Pan/Crop.

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Adjust the Y Center(1) to 113 or as needed. Notice how it moves(2)
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Now to eliminate the bottom portion. Click Mask(1) Then Click the Anchor Creation Tool (2) Now click Around the screen to cut off everything except the top(3) Notice how it removes the bottom screen (4)
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That's All.
Final Outcome