Originally Posted by chris319 View Post
This will give you an idea of what scalloping looks like. Note the wavy pattern. Picture scalloping was a common malady in quad videotape machines when the guide height was set incorrectly.

https://upload.wikimedia.org/wikipedia/commons/0/09/Argopecten_irradians.jpg

I know what a scallop is

"Wavy"- ahhh - you're probably not viewing it at 1:1 at normal dimensions . I'm thinking you have it scaled to fit a frame, and it's scaling it progressively

Take a screenshot with VLC . Shift+S is the default hotkey

Also try the ffplay suggestion above , and/or take a screenshot with ffmpeg