iOS Swift: Video Thumbnail Error

Unable to generate thumbnail from video in gallery

Use UIImagePickerController.InfoKey.mediaURL to key into the info dictionary. UIImagePickerController.InfoKey.referenceURL is deprecated.

func didSelectVideo(at url: URL) {
    let asset = AVAsset(url: url)
    let generator = AVAssetImageGenerator(asset: asset)
    generator.appliesPreferredTrackTransform = true
    let cgImage = try! generator.copyCGImage(at: CMTimeMake(value: 0, timescale: 1), actualTime: nil)
    let thumbnail = UIImage(cgImage: cgImage)
    cell.image.image = thumbnail
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    dismiss(animated: true) {
        guard let url = info[.mediaURL] as? URL else { return }
        self.didSelectVideo(at: url)
    }
}

Thumbnail error occurred in UITableView

If you're using youtube API that is not giving you video thumbnail url?

I can see the URL you're passing to getting the thumbnail is already a thumbnail url so you don't need to do anything extra. The reason is of your error is same you're passing an image url to AVURLAsset which expects a video url instead. So it can not be open.

You just need to use SDWebImage or any other third party library to showing the image on imageView. It handles the cache and asynchronous downloading itself.

Example of SDWebImage:

cell.imageForMain.sd_setImage(with: URL(string: "http://img.youtube.com/vi/\(youtubeId!)/1.jpg"), placeholderImage: UIImage(named: "placeholder.png"))

Cannot generate Video Thumbnails with Cache in Swift

You can use the URLCache:

func previewImageFromVideo(url: NSURL) -> UIImage? {
    let url = url as URL
    let request = URLRequest(url: url)
    let cache = URLCache.shared

    if
        let cachedResponse = cache.cachedResponse(for: request),
        let image = UIImage(data: cachedResponse.data)
    {
        return image
    }

    let asset = AVAsset(url: url)
    let imageGenerator = AVAssetImageGenerator(asset: asset)
    imageGenerator.appliesPreferredTrackTransform = true
    imageGenerator.maximumSize = CGSize(width: 250, height: 120)

    var time = asset.duration
    time.value = min(time.value, 2)

    var image: UIImage?

    do {
        let cgImage = try imageGenerator.copyCGImage(at: time, actualTime: nil)
        image = UIImage(cgImage: cgImage)
    } catch { }

    if
        let image = image,
        let data = UIImagePNGRepresentation(image),
        let response = HTTPURLResponse(url: url, statusCode: 200, httpVersion: nil, headerFields: nil)
    {
        let cachedResponse = CachedURLResponse(response: response, data: data)

        cache.storeCachedResponse(cachedResponse, for: request)
    }

    return image
}

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