Comment by grayhatter

Set your graphics card to a hard limit at 24fps, and only use pre-rendered video. I think you'll find it stops dropping frames. Just like your analog TV, you won't even have to reduce the resolution!

If you don't understand why comparing a modern graphics pipeline, sitting ontop a general purpose CPU running a time sharing kernel, might be different enough to break the comparison to an old TV, I don't know how to help you...