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我正在合并多个视频，我想检测哪些视频处于纵向模式并在横向模式下旋转它们，以便所有电影都处于横向模式......除了实际旋转之外，我已经完成了所有工作并且工作得很好，我想这与旋转中心或组合旋转。

        AVMutableVideoCompositionLayerInstruction *videoTrackLayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:compositionVideoTrack];

        if([[AppDelegate sharedInstance] orientationForTrack:avAsset] == UIDeviceOrientationPortrait)
        {
            CGAffineTransform rotation = CGAffineTransformMakeRotation(M_PI/2);
            //CGAffineTransform translateToCenter = CGAffineTransformMakeTranslation(640, 480);
            //CGAffineTransform mixedTransform = CGAffineTransformConcat(rotation, translateToCenter);
            [videoTrackLayerInstruction setTransform:rotation atTime:nextClipStartTime];
        }
        else if([[AppDelegate sharedInstance] orientationForTrack:avAsset] == UIDeviceOrientationPortraitUpsideDown)
        {
            CGAffineTransform rotation = CGAffineTransformMakeRotation(-M_PI/2);
            [videoTrackLayerInstruction setTransform:rotation atTime:nextClipStartTime];
        }
        else if([[AppDelegate sharedInstance] orientationForTrack:avAsset] == UIDeviceOrientationLandscapeLeft)
        {
            CGAffineTransform rotation = CGAffineTransformMakeRotation(M_PI);
            [videoTrackLayerInstruction setTransform:rotation atTime:nextClipStartTime];
        }
        else if([[AppDelegate sharedInstance] orientationForTrack:avAsset] == UIDeviceOrientationLandscapeRight)
        {
            [videoTrackLayerInstruction setTransform:CGAffineTransformIdentity atTime:nextClipStartTime];
        }

如何正确旋转它们？我已经尝试了多个来源，但没有任何东西可以按应有的方式旋转它们。我对 320 比例拟合解决方案不感兴趣，我希望视频在使用 AVAssetExportSession 导出之前保持尽可能高的分辨率。

像这样的解决方案：

CGAffineTransform rotationTransform = CGAffineTransformMakeRotation(degreesToRadians(90.0));
CGAffineTransform rotateTranslate = CGAffineTransformTranslate(rotateTransform,320,0);

不适合我的需要，因为我已经尝试过了。你有什么想法？一些帮助将不胜感激。

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