Hi all, first time poster. I have a question, not a problem per se, but a question.
I've had a number of computers over the years, from Macbook Pros laptops to PCs I've built myself to brand new iMac computers at work. I've noticed this problem on a few computers, and I've never been able to figure it out.
Sometimes, when I'm watching a video, I'll notice that the entire video seems to be slowing down and speeding up ever so slightly at a frequency of about 2 Hz or so (audio is unaffected). I've recently been looking into purchasing some video cards for a few older computers I have so I downloaded the "Heaven" benchmarking software. The "problem" is much more obvious when there are large sweeping camera movements, although they don't have to be fast.
If you have the Heaven software, I noticed it very easily on scenes 17 and 18 in the benchmarking part of the app. Now, the weird thing is, during those scenes, the FPS counter was showing 60-70 FPS. Not the average FPS, but the real time FPS. This doesn't make sense to me. Generally higher FPS = smoother video (depending of course on what the video was rendered at.)
This "test" was done on my less than 1 year old iMac at work with very low settings in Heaven and done at 640x400 with AA on and with AA off (two separate tests). (Just doing it for a comparison, I expected the computer to pass with flying colors. But I noticed this a long time ago on my old macbook pros when watching hulu for example (with plenty of bandwidth). Now, maybe those scenes were just rendered that way for some reason, but I have no way to tell. (My old computers are in no way capable of running heaven at 30 FPS let alone 60FPS, hence the need for better video cards.)
Is there any explanation for this? Has anyone else ever noticed the same thing? It drives me nuts!
EDIT: If you want to try to duplicate my results with the (Free) heaven software, the settings on my mac were
API: OpenGL (dunno why it won't let me select DirectX)
Anti-Aliasing: off (run 1) and x4 (run 2)
Full Screen: unchecked
Edited by corrado33, 22 January 2014 - 01:10 PM.