how can I access the value in the red circle in the screen shot? It’s a property of a Transform strip in the VSE.
The value is animated, i.e. there is an F-curve for it, so it’s value changes during animation.
I’ve copied the data path using right-click -> copy data path:
which syntactically works, but during rendering an animation (Ctrl+F12, NOT Alt+A), the value is constant for all rendered frames. It has the value at the current frame when starting the animation. Maybe that’s what the name “scale_start_x” indicates.
So how can I access the value at the frame to be rendered? (I want to use it in a Driver using a scripted expression)