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Avassetexportsession

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

Avassetreader

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).



Others

Example

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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