AVCaptureSession specify resolution and quality of captured images obj-c iphone app

Question

Hi I want to setup AV capture session to capture images with specific resolution (and, if possible, with specific quality) using iphone camera. here\'s setuppi

Answer 1

Refer to Apple's guide Capturing Still Images section regarding which sizes you'll get if you set one or another preset.

The parameter you should change is captureSession.sessionPreset

Answer 2

Try to go with something like this where cx and cy are your custom resolutions:

NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                              AVVideoScalingModeResizeAspectFill,AVVideoScalingModeKey,
                           AVVideoCodecH264, AVVideoCodecKey,
                           [NSNumber numberWithInt:cx], AVVideoWidthKey,
                           [NSNumber numberWithInt:cx], AVVideoHeightKey,
                           nil];
_videoInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings];