Overlay Two Videos with AVFoundation

Question

I am trying to overlay two videos, with the foreground video being somewhat alpha transparent. I have been following the Apple Docs as well as This tutorial.

Whenev

Answer 1

Your min should be max...

Replace this line

instruction.timeRange = CMTimeRangeMake(kCMTimeZero, min(firstAsset.duration, secondAsset.duration))

With this line and it will work :

instruction.timeRange = CMTimeRangeMake(kCMTimeZero, max(firstAsset.duration, secondAsset.duration))