I'm displaying to the user an image picker to select a video from the gallery. That works, i pass the mediatype ["public.movie"] and all the videos of the gallery are displayed to pick up. When the user picks it i receive in my dellegate:
extension VNInventoryCollectionVC: UIImagePickerControllerDelegate {
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
let info = convertFromUIImagePickerControllerInfoKeyDictionary(info)
if let pickedImage = info[convertFromUIImagePickerControllerInfoKey(UIImagePickerController.InfoKey.originalImage)] as? UIImage
{
pickImageCallback?(pickedImage)
}
if let videoURL = info["UIImagePickerControllerReferenceURL"] as? URL
{
print(videoURL)
pickImageCallback?(videoURL)
}
dismiss(animated: true)
}
}
After the callback i'm trying to create a image thumbnail from that video, and that is where i'm not able to do it:
let thumbnail = getThumbnailFrom(path: multimedia.video!)
cell.image.image = thumbnail
The function that generates the thumbnail is:
func getThumbnailFrom(path: URL) -> UIImage? {
do {
print("Video URL: \(path)")
print("Video absolute URL: \(path.absoluteURL)")
//let asset = AVURLAsset(url: path.absoluteURL! , options: nil)
var asset : AVAsset = AVAsset(url: path.absoluteURL) as! AVAsset
let imgGenerator = AVAssetImageGenerator(asset: asset)
imgGenerator.appliesPreferredTrackTransform = true
let cgImage = try imgGenerator.copyCGImage(at: CMTimeMake(value: 0, timescale: 1), actualTime: nil)
let thumbnail = UIImage(cgImage: cgImage)
return thumbnail
} catch let error {
print("*** Error generating thumbnail: \(error.localizedDescription)")
return nil
}
}
In the console the video url displayed is:
Video URL: assets-library://asset/asset.MP4?id=84D1CEDD-7AE4-4FE5-897E-47608DC2CFF0&ext=MP4
Video absolute URL: assets-library://asset/asset.MP4?id=84D1CEDD-7AE4-4FE5-897E-47608DC2CFF0&ext=MP4
The displayed error is that is unable to open the file. The line that breaks is:
let cgImage = try imgGenerator.copyCGImage(at: CMTimeMake(value: 0, timescale: 1), actualTime: nil)
I suppose the problem is with the url, that i have an assets url and i would require an absolute file path or something like that.
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)
}
}