record video with AVFoundation with custom dimensions?

Question

I am recording an MOV file using AVFoundation but im having trouble finding out how to change the dimensions of the video. I have videoGravity property of captureVideoPreviewLayer set to AVLayerVideoGravityResizeAspectFill and the UIView showing the preview layer has custom dimensions (not the same aspect ratio of the screen).

Recording works fine but the dimensions of the recorded video are the same as the aspect ratio of the screen. How can i record with the aspect ratio of the UIView or the preview layer?

Do you want to crop the video to the new dimensions, scale it or morph it? — MobileOverlord, Feb 22 '12 at 18:47
@MobileOverlord i guess both crop and scale up since GravityResizeAspectFill does just that — KDaker, Feb 23 '12 at 20:17

score 3 · Answer 1 · edited May 17 '13 at 07:35

Here is best sample code to record video using AVFoundation

https://developer.apple.com/library/ios/#samplecode/RosyWriter/Introduction/Intro.html#//apple_ref/doc/uid/DTS40011110

In File: RosyWriterVideoProcessor.m

Method Name

- (BOOL) setupAssetWriterVideoInput:(CMFormatDescriptionRef)currentFormatDescription

In videoCompressionSettings you can change dimension, hope this will help you.

record video with AVFoundation with custom dimensions?

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