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First, you need to use the system version above iOS 12.0 and below iOS 12.0 to compare the test result, according to the following steps.1. Run the project with the sample program named ReaderAsset.2. After waiting for the screen completed, the console prints out the text 'export movie to PhotosAlbum'.3. Then go to the phone album and get the new video.4. Color contrast the new video with the old video. The red color is different from the new video to the old video on devices above iOS 12.0 system, but the same red color on below iOS 12.0 system.I have provided the demo that can be reproduced and the new video needed to reproduce the problem, and the old video generated, which can be compared and viewed.http://pab2071yd.bkt.clouddn.com/ReaderAndWriterAsset.ziphttp://pab2071yd.bkt.clouddn.com/20190821153411623.MP4http://pab2071yd.bkt.clouddn.com/20190821153411623-after.mp4