I just started the game, and even though there's a 2560x1080 option in the settings, the videos won't function. The opening cinematic is stretched the full width of the monitor (instead of having bars on the sides to keep the proper aspect ratio), and in-game videos stick on one frame while the audio plays. It basically makes the game unplayable. Is there a fix for this?

Cheers

I second this, The video doesn't work at all in ultrawide

Hello. Check out this thread- Cant view the movies on the Cut Scenes. it worked for me. I'm running a res of 3440 x 1440 and ran witcher on the same res as you. Hope it works for you.