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    <p>There is probably a better way to do this, but the following code should work. I'm assuming that you are using the GPUImage framework by Brad Larson. Note that this code will save a 480x480 square video.</p> <pre><code>//Square cropping UIImage *testImage = [filter imageFromCurrentlyProcessedOutput]; double camWidth = testImage.size.width; double camHeight = testImage.size.height; double offset; double normalizedOffset; CGRect normalizedCropFrame; if(camWidth &gt; camHeight) { offset = (camWidth - camHeight) / 2.0; normalizedOffset = offset / camWidth; normalizedCropFrame = CGRectMake(normalizedOffset, 0.0, camHeight/camWidth, 1.0); } else { offset = (camHeight - camWidth) / 2.0; normalizedOffset = offset / camHeight; normalizedCropFrame = CGRectMake(0.0, normalizedOffset, 1.0, camWidth/camHeight); } squareCrop = [[GPUImageCropFilter alloc] initWithCropRegion:normalizedCropFrame]; //pause camera while setting up movie writer [videoCamera pauseCameraCapture]; //set up movie writer pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.m4v"]; unlink([pathToMovie UTF8String]); NSURL *movieURL = [[NSURL alloc] initFileURLWithPath:pathToMovie]; movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(480.0, 480.0)]; //start recording [filter addTarget:squareCrop]; [squareCrop addTarget:movieWriter]; videoCamera.audioEncodingTarget = movieWriter; [movieWriter startRecording]; [videoCamera resumeCameraCapture]; </code></pre>
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    1. POHow to create Square Video using AVAssetWriter with IOS SDK?
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    1. USDavid Schwartz
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