AVEncoderASPFrequencyKey Declarationlet AVEncoderASPFrequencyKey: String See AlsoEncoder setting keysAVEncoderAudioQualityKeyAVEncoderBitDepthHintKeyAVEncoderBitRateKeyAVEncoderBitRatePerChannelKeyAVEncoderBitRateStrategyKeyAVEncoderContentSourceKeyAVEncoderDynamicRangeControlConfigurationKey