ABRMetadata
public class ABRMetadata : NSObject, CodableThe ABRMetadata specifies extra metadata that can be used to drive the ABR behavior of the player.
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                  Specifying the bitrate allows you to initially cap the bandwidth consumption to a specified bitrate, in bits per second. DeclarationSwift public let bitrate: Double?
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                  Constructs an ABRMetadata struct given a bitrate. DeclarationSwift public init(bitrate: Double)ParametersbitrateThe initial bitrate to cap the player ABR to. 
