Custom QAnimationDriver

[t.artikov]

Hi,
I'm trying to use Qt Quick for generation image sequence for video broadcasting.
To do that I need to update Qt Quick scene animations with frame rate of the output video.
I tried to create class derived from QAnimationDriver and overload the QAnimationDriver::advance method which calls QUnifiedTimer::updateAnimationTimers to control current time of animations.
The problem is that QUnifiedTimer::updateAnimationTimers method is called from other places avoiding my AnimationDriver (for example when a new animation is started).
As result, animations are updated with incorrect time.

Here is a link to my test code:
https://dl.dropboxusercontent.com/u/25159021/animation_driver_test.zip
There is the Qt Quick scene with a button and some animated objects.
Moving the mouse cursor over the button leads to jerking of animations.