It's possible it could be a resolution thing, especially if you are running an ultrawide monitor. Win10 has some functions that will scale things oddly when using high DPI monitors. You can turn off some of these features per program and that might help. Right-Click on the game EXE and then hit properties and navigate to the compatibility tab. There should be a button for "change high DPI settings" ... at least there will be in Win10 (It's probably there in Win11 too I just can't confirm what that looks like at the moment). Check the box under "high DPI scaling overide" and choose "Application" in the drop down menu.
As far as audio goes, can you confirm whether you get audio in the videos when you play them independantly of the game?
EDIT: I'll second the recommendation to check which version of the OpenGL patch you installed. Are you using v1.22
https://www.wcnews.com/wcpedia/OpenGL_Patch ?
you might also want to experiment with checking on which version of wcphr.dll you are using as well . Theoretically you want the newest one but if you have exhausted all other options it doesn't hurt to try out some of the others... back up your existing one so you can revert if need be
https://download.wcnews.com/files/wcp/wcpmoviepatch_testrelease.zip