以编程方式访问iPhone视频 [英] Programmatically access orientation of an iPhone video

问题描述

我需要访问UIImagePickerController返回的视频，并知道它是纵向记录还是横向记录.我已经看到了对mov_read_tkhd的引用，但是我不确定这是否可以完成工作，或者不确定如何包括必要的库.

I need to access a video returned by the UIImagePickerController and know if it was recorded portrait or landscape. I've seen references to mov_read_tkhd but I'm not sure if that will do the job, or indeed how to include the necessary libraries.

推荐答案

在iOS 4及更高版本上，如果使用3GS/第三代iTouch或更高版本，则可以使用新的AVFoundation库.

On iOS 4 and above, with 3GS/3rd gen iTouch or better, you can use the new AVFoundation libraries.

类似的东西:

NSURL *url = // url to the video returned by the picker
AVAssetTrack *videoTrack = [[url tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
videoTrack.preferredTransform; // CGAffineTransform that tells you whether the video is rotated from original orientation
videoTrack.naturalSize; // CGSize that tells you the current dimensions of the video

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