Global Variable

AVVideoCompressionPropertiesKey

A key to access the dictionary of compression properties for a video asset.

Declaration

NSString *const AVVideoCompressionPropertiesKey;

Discussion

The value for this key is an instance of NSDictionary. Add entries to this dictionary to manually change bit rate, B-frame delivery, I-frame interval, and codec quality. Querying the supportedOutputSettingsKeysForConnection: method reveals the keys supported for the current release and configuration.

See Also

Compression

AVVideoAverageBitRateKey

A key to access the average bit rate—as bits per second—used in compressing video.

AVVideoQualityKey

A key to set the JPEG compression quality of the video.

AVVideoMaxKeyFrameIntervalKey

A key to access the maximum interval between keyframes.

AVVideoMaxKeyFrameIntervalDurationKey

A key to access the maximum interval duration between keyframes.

AVVideoAllowFrameReorderingKey

A key to access permission to reorder frames.