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[Seiseki]

Ever since adding a parallax background I've started seeing really heavy ghosting or motionblur in our game. It became even more apparent in this video, recorded with a framerate that was twice as high as on my own PC.(video compression also made it look much worse)

I tried forcing Vsync on in Nvidia controlpanel, and I still got the ghosting when the framerate is locked at 60 fps.
Not as bad as in the video, but still as bad without vsync on.

What I'm wondering is if this a common issue in openGL?
Or is it because of unstable framerate or just the sharp textures moving too fast on a high contrast background?
Maybe even something else entirely..

[Polly]

What I'm wondering is if this a common issue in openGL?

No.

Maybe even something else entirely..

Whatever is causing this, it's not because of OpenGL. Perhaps you're accidentally drawing everything twice ( once using the view matrix of the last frame ) or not clearing the screen properly, or swapping the buffer at the wrong time ..

[randomnine]

Video compression can cause ghosting, as can monitors with long response times.

Can you up an uncompressed screenshot which shows the problem?

[Seiseki]

Video compression can cause ghosting, as can monitors with long response times.

Can you up an uncompressed screenshot which shows the problem?

Hm, interesting..
Apparently my monitor is terrible, and it was supposed to be a gaming monitor..

Because I tried taking a screenshot ingame and got a perfectly clear image, so I thought maybe it pauses for a bit when taking the screen. Then I checked a new version of the video with better quality and paused a frame and there was no ghosting at all.

I know the youtube video has ghosting because you can pause it and you see it on the still frame. But that was compression issues.

So this is both good and bad news I guess.. 

[ThemsAllTook]

Some combination of recording your video at the frame rate it'll be when uploaded to YouTube (max 30 FPS, sadly) and using a higher bit rate might help reduce video artifacts.

[Average Software]

I'd say it's almost certainly your monitor.  On mine (I still use a CRT) it looks perfectly fine.