Add framerate logging for both application rendering and video streams

[rafaellehmkuhl]

The average framerate is logged at debug level every second, while the framerate drop logs happen if a 10% threshold is archieved.

I've evaluated the application for any performance loss but couldn't notice any.

Fix #1162
Fix #1163

[ArturoManzoli]

In my case, there is always a warning saying that a low framerate was detected, even though the frame rate is high, about 120 fps.

I got a little confused with what is a normal framerate (for me 60 fps is ok).

[rafaellehmkuhl]

In my case, there is always a warning saying that a low framerate was detected, even though the frame rate is high, about 120 fps.

I got a little confused with what is a normal framerate (for me 60 fps is ok).

By "low framerate" there I mean that there was a drop in the framerate.
Your's is probably around 124Hz by default (your monitor is probably a high-frequency one, right?).

Will adjust the text to "A drop in the framerate was detected [...]"

[ArturoManzoli]

(your monitor is probably a high-frequency one, right?).

Will adjust the text to "A drop in the framerate was detected [...]"

Yep, 144Hz.

[rafaellehmkuhl]

(your monitor is probably a high-frequency one, right?).

Will adjust the text to "A drop in the framerate was detected [...]"

Yep, 144Hz.

Change done!