A suggestion that may work for you.
Use the Chroma key filter on the purple color of the video with the clips.
Does not have the same color in the clips should work XEON-E5-2680 v4 / Mem. 16GB DDR4
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Quote A suggestion that may work for you.
Use the Chroma key filter on the purple color of the video with the clips.
Does not have the same color in the clips should work

Thanks so much for the suggestion, AVPlayVideo. These virtual choir/ensemble videos have so many individual clips running at once (the singers enter after this introduction), using the chroma key almost always affects something within at least several of the musician's tiles. In this case it did eliminate the unwanted border, but also affected several clips. After much experimentation, I found the best case scenario so far was using settings of Color Range: 4, and Denoise: 4.

I tried using a different background color (bright green) in the imported clip, but that reintroduced those black lines.

Just under the chroma key section is a border section. I thought perhaps if I addedd a border the same purple color, that might obstruct what's going on with the black lines. But that purple border gets added to the outside of the clip, not along its edge. So that didn't help.

So still looking for solutions.

Thanks,

Jim PowerDirector 365, AMD Ryzen 7 3700X 8-core processor 4.05 GHz, 32GB RAM, Windows 10 64-bit OS, NVIDIA GeForce GTX 1660 SUPER

It may be easier to add a second chroma-key just to get rid of the border area. Use slightly different settings to catch the missed areas.

Intrigued by your problem, I tried to remove the black lines in various ways including the ones mentioned above.
The last attempt was with masking. I did a quick and dirty mask with keyframes to keep as close as possible to the borders of the expanding picture. I am sure that with a bit more time and a number of keyframes extra the job can be done perfectly. I used a little feather and added a purple color board. See the packed project attached.
I included the resulting file, you need to add the original file into the folder to make the project complete.
Let me know if that would work.
I am also curious to understand what you did in the first place, that caused the black lines to appear. Prevention is better than healing, right?

Hi,

Just a thought.

On my system the color of the background and the expanding clip are slightly different.








What happens if they are exactly the same?

Cheers
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