I'm using AVAssetExportSession in combination with AVAssetExportPresetPassthrough to stitch multiple videos together. Everything works quite fine, except after my first sub-clip should have finished, it's picture "freezes" on the last frame but the second is not going to play. I made sure to set the layer opacity to 0.0f once each clip has finished, if I use another Preset-Type everything works... Any hints?
I got in touch with Apple, they told me this is a bug, please find the the bugreport here : https://bugreport.apple.com/cgi-bin/WebObjects/RadarWeb.woa/3/wo/zpx0I9jVzf8090ZICwg1GM/5.83.28.0.9