After a brief historic overview about spatial audio reproduction, the concept of object-based audio reproduction is explained and the need for spatial audio scenes is stated. Several existing formats for describing object-based audio scenes are reviewed, with special focus on the description of movement of scene objects over time. A new scene authoring format named Audio Scene Description Format (ASDF) is presented. Its description of movement of scene objects is based on several types of splines, which are thoroughly investigated, both for position and for rotation. Finally, an open-source ASDF library implementation and two integrations of this library are presented, which make it possible for everyone to try the ASDF right now.<eng>
