How to check Resolution, bitrate of video in iOS

Question

I\'m developing a video compression functionally; my ideas are below:

1. Getting resolution and bit-rate of video.
2. Check resolution of video. If it larger 6

Answer 1

Here is Avt's answer updated and tested for Swift 3:

func resolutionForLocalVideo(url:URL) -> CGSize?
{
  guard let track = AVURLAsset(url: url).tracks(withMediaType: AVMediaTypeVideo).first else { return nil }
  let size = track.naturalSize.applying(track.preferredTransform)
  return CGSize(width: fabs(size.width), height: fabs(size.height))
}