Crop Recorded Video Frame

Question

I am trying to crop a video frame. I have recorded the video using AVFoundation framework. I need to crop the snapped image and recorded video into a square shape. I have done it for the UIImage which worked, and now I am trying to crop the video.

- (UIImage *)squareImageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
  // Cropping UIImage is working fine.
  CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(0,0, image.size.width, image.size.width));
  UIImage *result = [UIImage imageWithCGImage:imageRef scale:image.scale orientation:image.imageOrientation];
  CGImageRelease(imageRef);
  return result;
}

I tried to crop the video but it resulted in changing the whole video frame without cropping, and it looks stretched.

_writer = [AVAssetWriter assetWriterWithURL:url fileType:AVFileTypeQuickTimeMovie error:nil];
NSDictionary* settings = [NSDictionary dictionaryWithObjectsAndKeys:
                          AVVideoCodecH264, AVVideoCodecKey,
                          [NSNumber numberWithInt: 320], AVVideoWidthKey,
                          [NSNumber numberWithInt: 320], AVVideoHeightKey,
                          nil];
_videoInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:settings];
[_writer addInput:_videoInput];

Can anybody help me to solve this cropping issue for video? Thanks in advance.

Answer 1

Below is my code which is used to crop video.we need to set AVVideoCompressionPropertiesKey which contains AVVideoCleanApertureKey key for video settings.

I Reffered : How to crop video into square iOS with AVAssetWriter

NSDictionary *videoCleanApertureSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                            [NSNumber numberWithInt:cx], AVVideoCleanApertureWidthKey,
                                            [NSNumber numberWithInt:cx], AVVideoCleanApertureHeightKey,
                                            [NSNumber numberWithInt:10], AVVideoCleanApertureHorizontalOffsetKey,
                                            [NSNumber numberWithInt:10], AVVideoCleanApertureVerticalOffsetKey,
                                            nil];
NSDictionary *videoAspectRatioSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                          [NSNumber numberWithInt:3], AVVideoPixelAspectRatioHorizontalSpacingKey,
                                          [NSNumber numberWithInt:3],AVVideoPixelAspectRatioVerticalSpacingKey,
                                          nil];
NSDictionary *codecSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                               [NSNumber numberWithInt:960000], AVVideoAverageBitRateKey,
                               [NSNumber numberWithInt:1],AVVideoMaxKeyFrameIntervalKey,
                               videoCleanApertureSettings, AVVideoCleanApertureKey,
                               //videoAspectRatioSettings, AVVideoPixelAspectRatioKey,
                               //AVVideoProfileLevelH264Main30, AVVideoProfileLevelKey,
                               nil];
NSString *targetDevice = [[UIDevice currentDevice] model];
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                               AVVideoScalingModeResizeAspectFill,AVVideoScalingModeKey,
                               AVVideoCodecH264, AVVideoCodecKey,
                               codecSettings,AVVideoCompressionPropertiesKey,
                               [NSNumber numberWithInt:cx], AVVideoWidthKey,
                               [NSNumber numberWithInt:cx], AVVideoHeightKey,
                               nil];
_videoInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings];