  In this paper we first contribute a large scale online study (N=400) to
better understand aesthetic perception of aerial video. The results indicate
that it is paramount to optimize smoothness of trajectories across all
keyframes. However, for experts timing control remains an essential tool.
Satisfying this dual goal is technically challenging because it requires giving
up desirable properties in the optimization formulation. Second, informed by
this study we propose a method that optimizes positional and temporal reference
fit jointly. This allows to generate globally smooth trajectories, while
retaining user control over reference timings. The formulation is posed as a
variable, infinite horizon, contour-following algorithm. Finally, a comparative
lab study indicates that our optimization scheme outperforms the
state-of-the-art in terms of perceived usability and preference of resulting
videos. For novices our method produces smoother and better looking results and
also experts benefit from generated timings.
