Moving Video Overlays with Video

[rjbudz]

Hi all,

 

It seems to be a rather common feature of most video editing tools. An image overlay moves with the video to cover a specific part of the video even as it changes positions within the frame. Say a face or other aspect you want hidden.

 

VideoPad seems to only allow placement of an overlay in one of 9 positions (top left, top right, etc.)

 

Am I missing something? Perhaps there is a plugin I need?

 

Thanks!

[Nationalsolo]

Hi

 

The image overlay, as you correctly say can be placed in one of nine positions in the frame. It can be resized but its position will not change relative to the moving scene behind it i.e. the video clip placed on the sequence track.

It would seem from what you are saying that you would like the overlay to move with the video to keep a particular part of that video hidden. I don't think this can be done per se. (But I am quite willing to be shot down on this.)

 

The nearest effect that you might obtain that I can think of is to load your video clip as an overlay. Make it full size and set it against against a blank clip on the main sequence track. Then use the chroma key effect to "blank out" the section that you dont want seen in the overlay. (This will have to be done first) Unfortunately this will only work on an area (or more specifically AREAS) with a specific colour and furthermore you cannot define the perimeter of the area that you want to blank. So in general I am pretty sure it won't be of much use. The idea is that the overlay will play as the actual clip, with the chroma part transparent allowing the blank main sequence clip to show through.

The problem with the idea is that other areas of the image with the same hue also behave in the same way.

 

Perhaps somebody else can suggest an alternative.....This is far from an ideal solution.

 

Nat

[Nationalsolo]

Hi

 

"Perhaps somebody else can suggest an alternative.....This is far from an ideal solution."

 

I should add that you can process your clip externally from VP (or internally if you load the filter) using a "face/object" masking filter from here:...

 

http://www.infognition.com/VirtualDubFilters/processing.html

 

Look for NVeilerFilter

 

It will need to be unpacked and activated following the instructions in the accompanying PDF file. This should work if you pull your clip into VirtualDub. On the other hand VP is supposed to be compatible with VDub filters so you might be able to add this filter to the program effects database and use it within the program. I haven't tried it so I don't know.

 

Nat