AVReaderWriter: Offline Audio / Video Processing

Last Revision:	Version 3.1, 2016-09-13 Update for Swift 2.3 (Full Revision History)
Build Requirements:	Xcode 8.0, iOS 10.0 SDK, OS X 10.11 SDK
Runtime Requirements:	iOS 9.0, OS X 10.11

This sample demonstrates how to use AVAssetReader and AVAssetWriter to perform offline (i.e. non-real-time) processing of video and audio.