Daily Archives: October 18, 2014

Using a video composition to process certain videos causes an Xcode simulator hang

Video Export Project

I am working on a project that will process videos taken with the camera or pulled from the Photo Library and export them to MP4 format, reducing the dimensions and bit rate.

As part of this process I am using the code for SDAVAssetExportSession that is a AVAssetExportSession drop-in replacement with customizable audio and video settings.

Video Composition

I make use of an instance of AVAssetReaderVideoCompositionOutput that is added to AVAssetReader in SDAVAssetExportSession.m.  I set the videoComposition property of the former instance to a composition that allows me to set the render size and some appropriate transforms for scaling, etc. (CGAffineTransform).

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