How to receive bytes when video is recording

Question

i am developing iphone video app,in that i want to get bytes occupied in disk when user is recording the video itself .

- (void)imagePickerController:(UIImagePickerController *)picker 
didFinishPickingMediaWithInfo:(NSDictionary *)info;

this method is called after user is finished picking.is there any method

Answer 1

UIImage *img = [UIImage imageNamed:@"sample.png"];
 NSData *imgData = UIImageJPEGRepresentation(img, 0); 
 NSLog(@"Size of Image(bytes):%d",[imgData length]);

Answer 2

NSData *data = [info objectForKey: UIImagePickerControllerMediaMetadata];