Black video screen (recorded from OBS)

I cannot get videos that I record with OBS to import into my Cubase project as anything more than just a black screen. (mp4 or mov) They import succesfully, but do not appear in the video window.

I record videos of gameplay from my computer with OBS in order to do SFX timings in Cubase, but I can’t work around this. The videos open fine in Quicktime.

Why has Cubase’s video engine always been so finicky? I need a solution soon, with impending deadlines.