Grey outline around scaled image / video

RabbitEars

I'm layering a sequence of videos (of doodle-like videos, i.e., drawing) over a music track. These doodles are in mp4 format, and were created on the iPad using the screen record function, I believe.

The 'main' video is 16:9, but the doodle images are square (I 'letterboxed to aspect ratio').

All is fine when I don't resize / scale the doodle videos but when I do (in this case, enlarge), a grey outline appears around the image.

This problem doesn't happen when I only 'position' the same image / video.

I've attached a link to the main video : https://youtu.be/6KtcDgBsdcE The grey outline is first seen in 0:03 and then at 0:36 (several others similar in the rest of the video).

Any help would be appreciated.

Thank you.

borate

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borate

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