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    <p>With AVCapturePresets you have an explicit size that video or photos will be captured at. Once you take your photo, you can manipulate (crop, resize) to fit your desired size, but you cannot set a predetermined capture size.</p> <p>There are the acceptable presets:</p> <pre><code>NSString *const AVCaptureSessionPresetPhoto; NSString *const AVCaptureSessionPresetHigh; NSString *const AVCaptureSessionPresetMedium; NSString *const AVCaptureSessionPresetLow; NSString *const AVCaptureSessionPreset320x240; NSString *const AVCaptureSessionPreset352x288; NSString *const AVCaptureSessionPreset640x480; NSString *const AVCaptureSessionPreset960x540; NSString *const AVCaptureSessionPreset1280x720; </code></pre> <p>source: <a href="https://developer.apple.com/library/mac/#documentation/AVFoundation/Reference/AVCaptureSession_Class/Reference/Reference.html" rel="nofollow">https://developer.apple.com/library/mac/#documentation/AVFoundation/Reference/AVCaptureSession_Class/Reference/Reference.html</a></p> <p>This method is something I use that should help you scale to your desired size:</p> <pre><code>-(UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize; { UIGraphicsBeginImageContext( newSize ); [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)]; UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return newImage; } </code></pre> <p>Initializing session &amp; setting up preset:</p> <pre><code>// create a capture session if(session == nil){ session = [[AVCaptureSession alloc] init]; } if ([session canSetSessionPreset:AVCaptureSessionPreset320x240]) { session.sessionPreset = AVCaptureSessionPreset320x240; } else { NSLog(@"Cannot set session preset"); } </code></pre>
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    1. POHow to set frame size using Avcapture
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    1. COHow to use AVCaptureSessionPreset320x240..When i am using this i got error like this "use of undeclared identifier"
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    2. COSpecifically what did the error say? I'd modified my answer to include a sample of how I normally setup my preset. Because devices vary, it's a good idea to check to make sure a device can run at the selected preset.
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    3. COUnfortunately, `AVCaptureSessionPreset320x240` is only available for Mac OS X.
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