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Lines around polygon mask


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I am trying to overlay two video clips. I found the answers in this thread to be really useful:


However the example there with the flying saucer is using a mostly dark coloured image on a fairly dark background. My video clips are taken outside and are quite light in colour, especially the sky area, and I find that I am seeing dark lines around my cut-out area. If I use feathering that actually makes it worse and I get thicker lines.

I intitally thought the problem might be due to the lighting being very slightly different in the two clips, but I was able to reproduce the problem just using a solid white image overlaid on two tracks.Using the default reactangular mask I don't see the lines, but if you alter the mask shape they appear.

Any ideas how I can remove or reduce these lines?



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18 minutes ago, borate said:

Install the latest Windows version and see if the issue persists.  For licensed users upgrades are free for up to six months from purchase date.  After that, VP will continue to fully function but a fee will be required in order to register the newest.  Retain your old install file and registration info.

That seems to have fixed it.

Thanks 🙂

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