iPhone 5 retina display aspect ratio from AVFoundation

Question

AVFoundation provides different image aspect ratios that one can use when displaying video.

For example:

- NSString *const AVCaptureSessionPreset320x240;
- NSString *const AVCaptureSessionPreset352x288;
- NSString *const AVCaptureSessionPreset640x480;

http://developer.apple.com/library/mac/#documentation/AVFoundation/Reference/AVCaptureSession_Class/Reference/Reference.html#//apple_ref/doc/c_ref/AVCaptureSessionPresetHigh

On the iPhone4 and iPad, these resolutions are designed to be full-screen. But on an iPhone 5 with a retina display, the iPhone display is taller.

How is one supposed to handle displaying the video feed coming out of AvFoundation? Any options other than having to choose a larger aspect ratio and crop it, scale the video (messing up its aspect ratio), or leave some empty screen real estate in our app?

Answer 1

You can use AVCaptureSessionPreset1920x1080 preset on iPhone 5. See the AVCaptureSession Class Reference for iOS.

EDIT:

AVCaptureSessionPresetiFrame960x540 preset has the same ratio as AVCaptureSessionPreset1920x1080. This should be the best choice if you want to improve performance and keep the aspect ratio.