inPoint

The in point of the layer, expressed in composition time seconds .Floating-point value in the range [-10800.0..10800.0] minus or plus three hours ; read/wri

isTimeVarying

When true, the named property is time varyingï¾—that is, it has keyframes or an enabled expression. When this attribute is true, the attribute canVaryOverTime

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

startTime

The start time of the layer, expressed in composition time seconds .Floating-point value in the range [-10800.0..10800.0] minus or plus three hours ; read/w