AVPlayer playback fails while AVAssetExportSession is active as of iOS 10

Question

AVPlayer will randomly just play audio, not showing the video track...

Playing video correctly with AVPlayer while having an active compres

Answer 1

I found a solution to my problem. Like Sami said, the issue appears to be in AVVideoCompositionCoreAnimationTool which I was using to watermark my video. I shifted to using a CIFilter, which actually had cleaner code anyway.

I removed everything with CoreAnimationTool and used this (mixComposition is my AVMutableComposition):

let watermarkFilter = CIFilter(name: "CISourceOverCompositing")!
let watermarkImage = CIImage(image: #imageLiteral(resourceName: "watermark"))!
let videoComposition = AVVideoComposition(asset: mixComposition) { (filteringRequest) in
    let source = filteringRequest.sourceImage.clampingToExtent()
    watermarkFilter.setValue(source, forKey: "inputBackgroundImage")
    let transform = CGAffineTransform(translationX: filteringRequest.sourceImage.extent.width - watermarkImage.extent.width - 2, y: 0)
    watermarkFilter.setValue(watermarkImage.applying(transform), forKey: "inputImage")
    filteringRequest.finish(with: watermarkFilter.outputImage!, context: nil)
}

and then in the AVAssetExportSession added this:

exporter!.videoComposition = videoComposition

Hope that helps somebody!