I have always exported using the YouTube export
But lately I am having problems!
I have an intro that I made using ShotCut that contains images added with intro music and saved as 1920 x 1080.
The green screen background is also 1920 x 1080 as is the video I import onto that.
But when I go to YouTube export the standard is set as 640x640 16:9
When I change that to 1920 x 1080 the intro is then stretched so the images in that intro look long and yet they were alright when the intro video used was imported