Instance Property

passthroughTrackID

The track identifier from an instruction source frame.

Declaration

@property(nonatomic, readonly) CMPersistentTrackID passthroughTrackID;

Discussion

If the video composition result is one of the source frames for the duration of the instruction, this property returns the corresponding track ID. The compositor won't be run for the duration of the instruction and the proper source frame will be used instead. The value of this property is computed from the layer instructions

See Also

Getting Composition Instruction Properties

backgroundColor

The background color of the composition.

layerInstructions

An array of video composition layer instruction instances of that specify how video frames from source tracks should be layered and composed.

timeRange

The time range during which the instruction is effective.

enablePostProcessing

A Boolean value that indicates whether post processing is required for the video composition instruction.

requiredSourceTrackIDs

An array of track identifiers required to compose frames for the instruction.