Swift4.2 grab screenshot from Video - swift

Question

in Swift 4.2 I am trying to grab screenshot from video
func thumbnailImageFor(fileUrl:URL) -> UIImage? {
let asset = AVAsset(url: fileUrl)
let assetImgGenerate = AVAssetImageGenerator(asset: asset)
assetImgGenerate.appliesPreferredTrackTransform = true
let time = CMTimeMakeWithSeconds(1.0, preferredTimescale: 600)
do {
let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
let thumbnail = UIImage(cgImage: img)
return thumbnail
} catch {
print(error)
return nil
}
}
But getting error:
Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could
not be completed" UserInfo={NSLocalizedFailureReason=An unknown error
occurred (-12792), NSLocalizedDescription=The operation could not be
completed, NSUnderlyingError=0x600000f46580 {Error
Domain=NSOSStatusErrorDomain Code=-12792 "(null)"}}
video's url:
https://firebasestorage.googleapis.com/v0/b/lailaichatapp.appspot.com/o/message_movies%2F8A61AC4E-4A08-4EC7-BC78-A5D861BE48C5.mov?alt=media&token=8906971d-59d7-4880-988e-135615c10f22
am I missing something?

Answer 1

I think it may be an issue with the filetype of the movie, as this works:
import UIKit
import AVFoundation
func thumbnailImageFor(fileUrl:URL) -> UIImage? {
let video = AVURLAsset(url: fileUrl, options: [:])
let assetImgGenerate = AVAssetImageGenerator(asset: video)
assetImgGenerate.appliesPreferredTrackTransform = true
let videoDuration:CMTime = video.duration
let durationInSeconds:Float64 = CMTimeGetSeconds(videoDuration)
let numerator = Int64(1)
let denominator = videoDuration.timescale
let time = CMTimeMake(value: numerator, timescale: denominator)
do {
let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
let thumbnail = UIImage(cgImage: img)
return thumbnail
} catch {
print(error)
return nil
}
}
let url: URL = URL(string: "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ElephantsDream.mp4")!
let image: UIImage? = thumbnailImageFor(fileUrl: url)
print("Image: \(image)")