I'm trying to render two 4K videos side-by-side in one composite video. I'm setting the AVMutableVideoComposition renderSize to 7680x2160. I'm setting the AVAssetExportSession to the AVAssetExportPresetHighestQuality preset and writing to a .mov file.
However the export session only renders a video with a resolution of 3840x1080. It looks like it's scaling down to fit inside 3840x2160.
Is there any way to get the AVAssetExportSession to respect the larger renderSize of the AVMutableVideoComposition?
