source

The source AVItem for this layer. The value is null ina Text layer. UseAVLayer.replaceSource to change the value.AVItem object; read-only.

AVLayer object

The AVLayer object provides an interface to those layers that contain AVItem objects composition layers, footage layers, solid layers, text layers, and sou

frameBlendingType

The type of frame blending to perform when frame blending is enabled for the layer.A FrameBlendingType enumerated value; read/write. One of:FrameBlendingTyp