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An AVAssetExportSession object transcodes the contents of an AVAsset source object to create an output of the form described by a specified export preset.


You use an AVAssetReader object to obtain media data of an asset, whether the asset is file-based or represents an assemblage of media data from multiple sources (as with an AVComposition object).



In my experience avassetexportsession is slightly more performant than using avassetreader and avassetwriter for a straight forward format a - format b type conversion however that said it s probably not by enough to be too concerned about

from question  

Most performant method of processing video and writing to file - ios AVFoundation

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