yea ure right it uses 16:9.
wordpress automatically detects the width and height of a video when you upload it.
please go to media library in wp-admin.
click on one of those videos. then click on "edit more details"
Screenshot 2024-11-16 at 17.42.00.png
here you will see the widths and heights that wordpress detected (right bottom):
Screenshot 2024-11-16 at 17.44.00.png
can you check here if the correct size is set?
can you check if you put this exact video into your carousel :D
if the wrong width and heights are shown here it means wordpress couldnt recognize the sizes correctly.
I maybe found that the problem is the video compression with handbrake, could it be?
yes, maybe try to export the video in a different way or something?