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    <p>There is a Easiest way to do this without using GPUImageCropFilter</p> <p>gpuimagevideocamera.m</p> <pre><code> -(void)processVideoSampleBuffer:(CMSampleBufferRef)sampleBuffer{ if (capturePaused)return; CFAbsoluteTime startTime = CFAbsoluteTimeGetCurrent(); CVImageBufferRef cameraFrame = CMSampleBufferGetImageBuffer(sampleBuffer); int bufferWidth ; int bufferHeight; bufferHeight=480; bufferWidth=480; CMTime currentTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer);----etc} </code></pre> <p>your .m file</p> <pre><code> GPUImageVideoCamera *videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPreset640x480 cameraPosition:AVCaptureDevicePositionBack]; </code></pre> <p>GpuimageMovieWriter.m</p> <pre><code>outputSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:640.0], AVVideoWidthKey, [NSNumber numberWithInt:640.0], AVVideoHeightKey, AVVideoScalingModeResizeAspectFill,AVVideoScalingModeKey,nil]; assetWriterVideoInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:outputSettings]; assetWriterVideoInput.expectsMediaDataInRealTime = _encodingLiveVideo; // You need to use BGRA for the video in order to get realtime encoding. I use a color-swizzling shader to line up glReadPixels' normal RGBA output with the movie input's BGRA. NSDictionary *sourcePixelBufferAttributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithInt:kCVPixelFormatType_32BGRA], kCVPixelBufferPixelFormatTypeKey, [NSNumber numberWithInt:640], kCVPixelBufferWidthKey, [NSNumber numberWithInt:640], kCVPixelBufferHeightKey, nil]; // NSDictionary *sourcePixelBufferAttributesDictionary = [NSDictiona ry dictionaryWithObjectsAndKeys: [NSNumber numberWithInt:kCVPixelFormatType_32ARGB], kCVPixelBufferPixelFormatTypeKey, // nil]; assetWriterPixelBufferInput = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:assetWriterVideoInput sourcePixelBufferAttributes:sourcePixelBufferAttributesDictionary]; [assetWriter addInput:assetWriterVideoInput]; </code></pre>
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    1. POHow to create Square Video using AVAssetWriter with IOS SDK?
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