One of the things I found helpful to make sure my videos fill every pixel on my matrices, is to size/crop them ahead of time using this simple program: https://www.wondershare.com/pro/video-converter-ultimate.html
I never could get Adobe Premiere to crop to non-standard sizes, but this little program does it without a hitch. The idea is to pick a Ratio that matches your screen.
I have a 12mm pixel matrix that is 50 wide x 45 tall. When converting a 1280x720 video I have to crop to the correct ratio which would be 800x720. I'm getting rid of a lot of video on either side, but it fills every pixel on my matrix.
Hope this helps.
The video effect does this resizing for you. There is no need to pre process videos.
Yes, thank you for that!
But say for example you download the Frozen Let It Go official video from Youtube. There are letterboxed black bars above and below. Those are part of the video and on your matrix you would have black bars as well. If you crop the video beforehand, then all the pixels will be filled with video.
