Linear movement for shape mask

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Level 1

5 points

Linear movement for shape mask

I'm trying to keyframe a vertical movement for a shape mask but it is definitely "smoothing" out the beginning and end of the move, kind of like a bezier curve. The object that I'm masking is moving at a consistent speed but I am unable to track it with my mask because the mask's movement is not linear.

I know that a normal object transformation has the option to change this movement from "smooth" to "linear" but I don't see any way to adjust the movement characteristics of the shape mask.

Does anyone have any suggestions?

Final Cut Pro X, Mac OS X (10.7.4)

Posted on Sep 15, 2017 1:42 PM

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Answer 1

Sep 15, 2017 2:52 PM in response to nschivley

IIf I understand correctly you have some object in your clip that is moving and you are applying a mask to follow it. There is no choice of linear vs smooth, I'm afraid.

Since the mask movement doesn't exactly match the object's, I believe you need to adjust it by adding intermediate keyframes. If you have Motion you may try using its tracking capabilities; and there are tools for tracking that can do what you want but cost money. For what you describe I believe SliceX would work great.

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Answer 2

nschivley Author

Level 1

5 points

Sep 15, 2017 4:01 PM in response to Luis Sequeira1

Thank you for the reply. I have tried key framing the intermediate steps like you mentioned, but the bezier in and outs are still there which makes it almost impossible to sync up.

I have SliceX but the object that I'm tracking is not actually an object, but rather a slow rolling horizontal band that spans the entire frame which was a result of LED lights screwing with the shutter speed. So I'm trying to keyframe a moving color mask to correct the issue but it is proving very time-consuming and not all that effective.

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Answer 3

Sep 18, 2017 5:54 AM in response to nschivley

nschivley wrote:

Can't reshoot.. it was a wedding.

This is tricky. It may require a lot of manual labor, and it may not be perfect in the end.

Would it be possible to post a very small excerpt of the original footage showing the problem, to a place like dropbox or similar? I understand if it is not possible, but I'd like to test a crazy idea.

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