key matte box – move video underneath? (“animated crop” / travelling matte)

[Ivan Myles]

Create a second sequence to animate the clip, and embed the sequence in the main timeline.

[Ann Bens]

The travelling matte is broken.
Nest the video and animate in the nest.
Add the matte effect to the nested clip in the main timeline.

Instead of nesting you can use the transform effect to animate
Postition and anchor point values need to be the same.

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Adobe Certified Expert Premiere Pro CC
Adobe Community Professional

[Tim Kolb]

The track matte is designed to work this way… A matte that “tracks” the movement of its source clip. Many people don’t get the intent of the design until I show them 6 clips that all need to be matted in the same shape, all 6 clips can use the same matte and be positioned individually on the screen…because the matte “tracks” the clip position in each case.

You can use the transform effect to “slide” the video around in the matte, but as Ann notes, the anchor point and position values both need to be animated together, or the “slide” of the video will be accompanied by a proportional offset in the matte position. Also, you need to position the transform effect ON TOP of the track matte effect in the effects list (in the Effect Controls panel) to make it work.

I think most of us who have used Premiere Pro for a while just nest the video clip in its own sequence and do the motion there, assigning the track matte to the nested sequence.

TimK,
Director, Consultant
Kolb Productions,

Adobe Certified Instructor

[Ann Bens]

I cannot remember which version but there was a time where you could move the clip in the timeline without dragging the mask with it.

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Adobe Certified Expert Premiere Pro CC
Adobe Community Professional

[Tim Kolb]

[Ann Bens] “…there was a time where you could move the clip in the timeline without dragging the mask with it.”

Yes, but I can’t remember what version that would have been either. It seems to me that this method came around the time of multiple sequences/settings in one project.

If you really consider what a ‘track’ matte should do vs a ‘traveling’ matte (usually extracted from foreground footage) vs just a plain ‘matte’…it sort of makes sense the way it’s set up even though this method isn’t the way all manufacturers approach it.

TimK,
Director, Consultant
Kolb Productions,

Adobe Certified Instructor

[Tim Kolb]

Returning to this thread for one last item…

If the track matte needs to stay in position with the background while the key fill moves inside it, you can also assign the track matte to the background layer and reverse it, creating a “hole”…and lace the key fill on a lower layer and manipulate it (in this case the key fill layer needs no key effect).

TimK,
Director, Consultant
Kolb Productions,

Adobe Certified Instructor

[Tad Newberry]

Hey,

Just letting you know i revisited this problem again today and saw your post again with the simple solution. It works great and does exactly what i need it to do. Thanks again!

thanks for helping out a bonehead!
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