iPhone Read UIimage (frames) from video with AVFoundation

Question

Sorry for my english) Looking for information about read frames from a video with iPhone i found this project, http://www.codza.com/extracting-frames-from-movies-on-iphone/c

Answer 1

In Swift 4 this worked for me with some modifications, mainly changing the "at" parameter of imageGenerator.copyCGImage to a CMTime type:

func showFrame(from file:String) {
    let file = file.components(separatedBy: ".")
    guard let path = Bundle.main.path(forResource: file[0], ofType:file[1]) else {
        debugPrint( "\(file.joined(separator: ".")) not found")
        return
    }
    let url = URL(fileURLWithPath: path)
    let image = previewImageForLocalVideo(url: url)
    let imgView = UIImageView(image: image)
    view.addSubview(imgView)
}    

func previewImageForLocalVideo(url:URL) -> UIImage? {
    let asset = AVAsset(url: url)
    let imageGenerator = AVAssetImageGenerator(asset: asset)
    imageGenerator.appliesPreferredTrackTransform = true
    let tVal = NSValue(time: CMTimeMake(12, 1)) as! CMTime
    do {
        let imageRef = try imageGenerator.copyCGImage(at: tVal, actualTime: nil)
        return UIImage(cgImage: imageRef)
    }
    catch let error as NSError
    {
        print("Image generation failed with error \(error)")
        return nil
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    showFrame(from:"video.mp4")
}

Source