HVX editing solution (overlayed cropping)

A

ajs473

Active member
im shooting a short in two weeks on an hvx in 720pn and in the short there is a scene in which a man comes flying out of a freestanding door in the middle of a field. in order to accomplish this i was going to just film with a static camera with no actor for a small while and then overlay this (cropped up to the edge of the doorframe) on top of the shot with the actor, so that the empty overlayed footage would cover half of the frame and the actor would fall through the door into the other half of the frame. am i going to run into any frame line problems on the line where the overlay ends? theoretically if the camera stays perfectly still there shouldnt be, but im renting an hvx and can't really test this.

thanks
andrew
 
Why not just set up a door in the middle of the field and have him walk out of it? It would probably be easier to erase him on the back side by cropping in a clean plate of the same shot. It will look the most real if you shoot everything that can be shot as one piece together. You won't have to worry about matching the lighting or anything.
If you end up needing a lot of roto you can farm this out to a company like rotofactory.com. It will cost less than you think and look great.
cheers,
Sam
 
thats what i am doing, i just explained it a little awkwardly . but im worried that the edges of the cropped clip that i put over top of him will be visible. even though they shouldnt be, sometimes they are. i've only tried it with interlaced video though.
 
With a little feathering you should be fine. What are you editing in? You might be better off doing this shot in something like After Effects.
 
Andrew...

You pretty much have it figured out correctly. Set up the door. Start rolling camera. Wait for 10 seconds, then have your talent run through the door.

In post, combine the clean half of the shot to cover up the part where the talent makes his running start at the door.

Using After Effects or similar, you can make this shot end up looking perfectly clean. If you shoot it in 1080 it's possible to zoom-in on it slightly in post so that you can add a pan to the final effect.

If you need help on this drop me an email.
 
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