frameDuration

The duration of a frame, in seconds. This is the inverse of the frameRate value frames-per-second .Floating-point; read/write.

timeSpanDuration

The duration in seconds of the composition to be rendered. The duration is determined by subtracting the start time from the end time. Setting this value is

activeAtTime()

Returns true if this layer will be active at the specified time. To return true, the layer must be enabled, no otherlayer may be soloing unless this layer i

workAreaDuration

The duration of the work area in seconds. This is the difference of the start-point and end-point times of the Composition work area.Floating-point; read/wr