Quote Originally Posted by bahbah30 View Post
Do you know one non commercial that works with minGW on windows (with multitreadinbg support)?
I'm not that fond of Windows, sorry. You can run linux as a virtual machine and use Valgrind. That's the best profiling tool available. As for gprof, I know it can handle threads at least on Linux with a bit of tweaking. Moreover you can rem out the thread for now and emit bogus data - then you'll be able to use gprof directly.

It encapsulates ffmpeg to decode Video and emits QImage as Signal.
Can we see the code and the connect statement using the signal?


I Know, but the question ist still, why it works fine on ATI and so bad on NVIDIA?
You'd have to ask ATI and NVIDIA, their GL drivers are proprietary Nobody will be able to tell you the exact code paths used in both cases.

I suggest you start by getting rid of the timer and updating the widget when something really changes in it.