Class: AVVideoCompositionInstruction

Inherits:
NSObject show all

Overview

An AVVideoCompositionInstruction object represents an operation to be performed by a compositor.

Direct Known Subclasses

AVMutableVideoCompositionInstruction

Instance Attribute Summary (collapse)

Method Summary

Methods inherited from NSObject

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Constructor Details

This class inherits a constructor from NSObject

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class NSObject

Instance Attribute Details

- (CGColorRef) backgroundColor

The background color of the composition. Only solid BGRA colors are supported; patterns and other supported colors are ignored. If the rendered pixel buffer does not have alpha, the alpha value of the background color is ignored.If the background color is NULL, the video compositor uses a default background color of opaque black.

Returns:

  • (CGColorRef)

- (Boolean) enablePostProcessing (readonly)

Indicates whether post processing is required for the video composition instruction. (read-only) A value of NO indicates that no post processing is required for the whole duration of the video composition instruction. The composition process is more efficient if the value is NO.The value is YES by default.

Returns:

  • (Boolean)

- (Array) layerInstructions (readonly)

An array of instances of AVVideoCompositionLayerInstruction that specify how video frames from source tracks should be layered and composed. (read-only) Tracks are layered in the composition according to the top-to-bottom order of the layerInstructions array; the track with trackID of the first instruction in the array will be layered on top, with the track with the trackID of the second instruction immediately underneath, and so on.If the property value is nil, the output is a fill of the background color.

Returns:

- (CMTimeRange) timeRange (readonly)

The time range during which the instruction is effective. (read-only) If the time range is invalid, the video compositor will ignore it.

Returns:

  • (CMTimeRange)