Some effects can generate images at non frame boundaries, even if the inputs to the effect are frame based and there is no animation.
For example a fractal cloud generator whose pattern evolves with a speed parameter can be rendered at arbitrary times, not just on frame boundaries. Hosts that are interested in sub frame rendering can determine this by behaviour by examining the
property set in the clip preferences action. By default this is false.
Implicitly, all retimers effects can be continuously sampled.