I edited a video on Shotcut. Then I uploaded it to YouTube. As far as I know it was the automatic Shotcut size of 1920 x 1080 pixels, which is a 16:9 ratio. When it plays on YouTube, it has white bars on each side of the screen. Is there a way to eliminate these and have the video fill the whole YouTube screen? The bar on the left is perhaps one-tenth the total screen width, and the same on the right.
Incidentally, is there a way for me to verify that the video is indeed 1920 x 1080 after it has been exported to my desktop?