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

Video resolution in Swift:

func resolutionForLocalVideo(url:NSURL) -> CGSize?
{
    guard let track = AVAsset(URL: url).tracksWithMediaType(AVMediaTypeVideo).first else { return nil }
    let size = CGSizeApplyAffineTransform(track.naturalSize, track.preferredTransform)
    return CGSize(width: fabs(size.width), height: fabs(size.height))
}

Solutions without preferredTransform do not return correct values for some videos on the latest devices!