You can use the Picture Arrange Transition to place the two video tracks on the same video screen. This transition provides you with presets to quickly place the videos side-by-side horizontally, vertically or diagonally. This transition is very useful when you want to prepare a movie that shows comparison.
The Picture Arrange transition provides presets for the most common video arrange placements. To use a preset, click the appropriate icon present under Preset. The green colored rectangle represents the Video Track 1 and the blue colored rectangle represents the Video Track 2.
You can visually arrange the pictures of the Video Track 1 and the Video Track 2 by dragging green and blue rectangles marked with a "1" and "2" respectively. The green rectangle represents Video Track 1 and the blue colored rectangle represents the Video Track 2. To change the size of the picture, drag the rectangles using the sizing markers at the corners and sides of the rectangle.
Using presets is the quickest means to arrange the pictures. For custom arrangement, it is best to use visually arrange the videos by dragging the picture's rectangles. After arranging the rectangles roughly on the screen, you can change the Actual Co-ordinates of the two videos by directly specifying the values.
You can change the left co-ordinate, right co-ordinate, width of the picture and height of the picture by entering the values in the Left, Top, Width and Height boxes respectively. The transition accepts all values in pixels. The screen in which you can fit the two pictures has the same width and height as that of the current project. For example if the project's dimension is 320 x 240 pixels then the screen's width is 320 pixels and height is 240 pixels. Thus, you can arrange the pictures within the bounds of the project's dimension.
By default the background color of the screen on which you arrange the two videos is black. You can change the background color to any color of your choice. To select a custom color, select Choose. To select a color present anywhere on the desktop, drag the eye dropper around the desktop and over the portion of the desktop where the color you want is located.
When you arrange the pictures of the two video tracks such that they overlap each other then the Second Video appears over the First Video. Check this option if you want the First Video to overlap the Second Video.