Fetch Thumbnail from Video URL using SDWebImage

Question

I need to fetch thumbnail from a video URL to display in ImageView that is in a UITableViewCell.

I can get thumbnail using this method but it takes lots of resource and hence the tableview scrolling lags and stops for the time cellForRowAtIndexPath is called.

This is the method.

func createThumbnailOfVideoFromFileURL(videoURL: String) -> UIImage? {
    let asset = AVAsset(url: URL(string: videoURL)!)
    let assetImgGenerate = AVAssetImageGenerator(asset: asset)
    assetImgGenerate.appliesPreferredTrackTransform = true
    let time = CMTimeMakeWithSeconds(Float64(1), 100)
    do {
        let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
        let thumbnail = UIImage(cgImage: img)
        return thumbnail
    } catch {
        return UIImage(named: "ico_placeholder")
    }
}

Can anyone please suggest me an alternative to use SDWebImage so that the images go to the cache and are not fetched everytime UITableView delegates are called. Kindly suggest any other approach if i m wrong.

You can use Kingfisher for the same, a good alternate...please find the link :-**https://stackoverflow.com/a/72564375/14180967** — Shivam Garg, Jun 09 '22 at 17:40

score 0 · Accepted Answer · answered Mar 24 '17 at 10:10

0

I used the above method as it is and cached the images in an array of UIImage and made a check in cellForRowAtIndexPath that if image exists at that particular index then use that else fetch the image in background.

answered Mar 24 '17 at 10:10

Ankit Kumar Gupta

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score 0 · Answer 2 · answered Jul 02 '20 at 07:12

Not using SDWebImage but this code works like a charm

func getThumbnailFromUrl(_ url: String?, _ completion: @escaping ((_ image: UIImage?)->Void)) {
        
        guard let url = URL(string: (url ?? "")) else { return }
        DispatchQueue.main.async {
            let asset = AVAsset(url: url)
            let assetImgGenerate = AVAssetImageGenerator(asset: asset)
            assetImgGenerate.appliesPreferredTrackTransform = true
            
            let time = CMTimeMake(value: 2, timescale: 1)
            do {
                let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
                let thumbnail = UIImage(cgImage: img)
                completion(thumbnail)
            } catch let error{
                print("Error :: ", error)
                completion(nil)
            }
        }
    }

Usage

self.getThumbnailFromUrl(video.url.description) { (image) in
     //Use image where you want to use
}

Fetch Thumbnail from Video URL using SDWebImage

2 Answers2