1

After exporting side-by-side videos into MP4 format, one video appears bigger than the other one even though they appear equal sizes in kinovea. Why is that and how can I make them equal sizes in the MP4 format?

2

What is the original size of each video and are you using horizontal side-by-side or vertical top-bottom? (so I can try to reproduce the problem)

If the two videos don't have the same size or don't have the same aspect ratio, the final size is computed based on the larger one and the other one is resized to fit.

If you see black bars on the sides of one of the video they probably don't have the same aspect ratio.

Does it have the same issue if you export a side-by-side image instead of a video?

Can you show a picture of what you see and what you would expect instead?
Thanks