iOS 10.3.3 Animated PNG's do not animate when using AVVideoCompositionCoreAnimationTool + AVAssetExportSession

Originator:matt.cielecki
Number:rdar://33522472 Date Originated:7/25/17
Status:Open Resolved:
Product:iOS 10.3.3 Product Version:
Classification: Reproducible:Always
 
We are using AVVideoCompositionCoreAnimationTool + AVAssetExportSession to generate an MP4 with a collection of APNG's in the video.  

The APNG's do not animate in the exported MP4.  This has just started occurring on iOS 10.3.3.  This did NOT occur in iOS 10.3.2 or earlier.

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