by 
Watch the tutorial
Step 1: Stack the door clip above your second shot
Put the clip you are transitioning to on V1 and the door clip on V2, directly above it. In the video, the door clip is a red wall with a door that opens, and the landscape shot sits underneath. Both clips start at the same point, so the scene you see through the door is already playing behind it.
Step 2: Test with Ultra Key
If your door clip has a green opening, you can use it to see the effect straight away. Open the Effects panel, search for Ultra Key (it lives under Video Effects > Keying) and drag it onto the door clip. In Effect Controls, click the eyedropper next to Key Color and click the green area in the Program monitor. The green disappears and your landscape shows through the doorway.
Faster with BetterFX: skip the Effects panel. Press your BetterFX shortcut, type the first letters of Ultra Key and press Enter to apply it to the selected clip. Get BetterFX
The key works well while the door is facing the camera. Once the door swings, the opening changes shape, and a simple key can leave a green edge. That is why the video switches to a mask for the finished transition.
Step 3: Draw a mask around the opening
Select the door clip and remove Ultra Key by clicking it in Effect Controls and pressing Delete. Then use the Pen tool icon under Opacity to draw a mask over the doorway in the Program monitor. Click once for each corner of the opening to form a shape. Tick Inverted so the mask cuts a hole in the door clip, and set Mask Feather to 0 for a crisp edge.
Step 4: Animate the mask frame by frame
Click the stopwatch next to Mask Path to start keyframing. Zoom the Program monitor in (the video uses around 200% to 400%) so you can place points precisely. Press the Right Arrow key to move forward one frame, then drag the mask points so they follow the edge of the door as it opens. Premiere Pro adds a keyframe each time you change the shape.
This takes a little patience. Work through the movement frame by frame, and play it back now and then to check that the opening stays clean.
Step 5: Play it back
Return to the start and press the spacebar. The door swings open and the scene underneath fills the doorway. When the door has finished moving, your second clip takes over the frame.
Tips
- Zoom in for accuracy. The more closely your mask follows the door edge, the more convincing the transition looks.
- Use a small feather if edges look harsh. A tiny amount of feather can hide small mistakes, but keep it low so the door stays sharp.
- Pick a matching second shot. A clip with similar lighting makes the jump through the door feel natural.
FAQ
How do I make a door transition in Premiere Pro?
Place a door clip above your next shot, mask the doorway with the Pen tool, invert the mask and animate its path as the door opens.
Do I need a green screen door?
No. A green area makes a quick test with Ultra Key easy, but an animated mask works on any door clip.
Can I use my own footage for the door?
Yes. Any clip where a door opens can work. Just put your second shot underneath and mask the doorway.
Looking for more ways to cut between shots? Try the free glitch transitions with sound pack.
