GPU framerate

[alexh200]

Hello, I'm not sure if this repo is still active or not but I figured I would try and post an issue anyways.

The issue I'm running into is that whenever I try to use the start_video_recording method with the GPU flag toggled, I experience frame drops in my recording. For example if I'm running it at 120 fps (recording a game) I will be in the neighborhood of 105ish fps (details pane of windows properties). Similarly, if there isn't much movement on the screen the output fps is way higher than what is set. If I have the GPU flag toggled to false I don't experience this issue at all. My hardware doesn't seem to be the limiting factor if I watch the usage in live time. This library is awesome and I hope this issue can be solved.

Thanks!