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iOSでビデオのURLまたはデータからサムネイルを取得する

Iphone 3GSカメラから撮影したビデオから（最初のフレームの）サムネイルを取得して、表示できるようにしています。これを行う方法？

iosiphonevideothumbnails
59
Daniel

この質問に対する答えは、iOS 4.0では、AVFoundationを使用してサムネイルを取得できるということです。クラスプロパティurlがムービーURLである次のコードは、トリックを実行します（例では、いつでもサムネイルを取得できます）時間0）

-(void)generateImage
{
    AVURLAsset *asset=[[AVURLAsset alloc] initWithURL:self.url options:nil];
    AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
    generator.appliesPreferredTrackTransform=TRUE;
    [asset release];
    CMTime thumbTime = CMTimeMakeWithSeconds(0,30);

    AVAssetImageGeneratorCompletionHandler handler = ^(CMTime requestedTime, CGImageRef im, CMTime actualTime, AVAssetImageGeneratorResult result, NSError *error){
        if (result != AVAssetImageGeneratorSucceeded) {
            NSLog(@"couldn't generate thumbnail, error:%@", error);
        }
        [button setImage:[UIImage imageWithCGImage:im] forState:UIControlStateNormal];
        thumbImg=[[UIImage imageWithCGImage:im] retain];
        [generator release];
    };

    CGSize maxSize = CGSizeMake(320, 180);
    generator.maximumSize = maxSize;
    [generator generateCGImagesAsynchronouslyForTimes:[NSArray arrayWithObject:[NSValue valueWithCMTime:thumbTime]] completionHandler:handler];

}
69
Daniel
-(UIImage *)generateThumbImage : (NSString *)filepath
{
    NSURL *url = [NSURL fileURLWithPath:filepath];

    AVAsset *asset = [AVAsset assetWithURL:url];
    AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
    imageGenerator.appliesPreferredTrackTransform = YES;
    CMTime time = [asset duration];
    time.value = 0;
    CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:NULL];
    UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);  // CGImageRef won't be released by ARC

    return thumbnail;
}

time.valueを使用してフレームを取得できます。1秒のフレームにしたい場合は、

time.value = 1000 //Time in milliseconds
69
Diken Shah
NSURL *videoURL = [NSURL fileURLWithPath:url];

MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];

        UIImage *thumbnail = [player thumbnailImageAtTime:1.0 timeOption:MPMovieTimeOptionNearestKeyFrame];

        //Player autoplays audio on init
        [player stop];
        [player release];

代替手段については、このリンクを確認してください： thumbnailImageAtTime：廃止予定-代替手段は何ですか？

23
Bushra Shahid

私が見つけた最良の方法... MPMoviePlayerController thumbnailImageAtTime:timeOption

13
E-Madd

Swift 2.0

次の2つの方法でSwiftを生成できます。1. AVFoundation 2. MPMoviePlayerController

1. 

    func generateThumnail(url : NSURL) -> UIImage{
            var asset : AVAsset = AVAsset.assetWithURL(url) as AVAsset
            var assetImgGenerate : AVAssetImageGenerator = AVAssetImageGenerator(asset: asset)
            assetImgGenerate.appliesPreferredTrackTransform = true
            var error       : NSError? = nil
            var time        : CMTime = CMTimeMake(1, 30)
            var img         : CGImageRef = assetImgGenerate.copyCGImageAtTime(time, actualTime: nil, error: &error)
            var frameImg    : UIImage = UIImage(CGImage: img)!

            return frameImg
        }

2. 

    override func viewDidLoad() {
            super.viewDidLoad()
            var moviePlayer         : MPMoviePlayerController!  = MPMoviePlayerController(contentURL: moviePlayManager.movieURL)
            moviePlayer.view.frame   = CGRect(x: self.view.frame.Origin.x, y: self.view.frame.Origin.y, width:
                                       self.view.frame.size.width, height: self.view.frame.height)
            moviePlayer.fullscreen   = true
            moviePlayer.controlStyle = MPMovieControlStyle.None
            NSNotificationCenter.defaultCenter().addObserver(self,
        selector: "videoThumbnailIsAvailable:",
        name: MPMoviePlayerThumbnailImageRequestDidFinishNotification,
        object: nil)


        let thumbnailTimes = 3.0
        moviePlayer.requestThumbnailImagesAtTimes([thumbnailTimes],
                timeOption: .NearestKeyFrame)
        }

    func videoThumbnailIsAvailable(notification: NSNotification){

        if let player = moviePlayer{
            let thumbnail =
            notification.userInfo![MPMoviePlayerThumbnailImageKey] as? UIImage

            if let image = thumbnail{

                /* We got the thumbnail image. You can now use it here */
                println("Thumbnail image = \(image)")
            }
        }
12
Dharmbir Singh

Swift 3.0

func createThumbnailOfVideoFromFileURL(_ strVideoURL: String) -> UIImage?{

let asset = AVAsset(url: URL(string: strVideoURL)!)
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 {
  /* error handling here */
}
return nil   }
8
Hiren Panchal

Swift 2コード：

func previewImageForLocalVideo(url:NSURL) -> UIImage?
{
    let asset = AVAsset(URL: url)
    let imageGenerator = AVAssetImageGenerator(asset: asset)
    imageGenerator.appliesPreferredTrackTransform = true

    var time = asset.duration
    //If possible - take not the first frame (it could be completely black or white on camara's videos)
    time.value = min(time.value, 2)

    do {
        let imageRef = try imageGenerator.copyCGImageAtTime(time, actualTime: nil)
        return UIImage(CGImage: imageRef)
    }
    catch let error as NSError
    {
        print("Image generation failed with error \(error)")
        return nil
    }
}
8
Avt

これは、同じ問題に直面している他の誰かに役立つかもしれません。画像、PDF、ビデオのサムネイルを作成する簡単なソリューションが必要でした。この問題を解決するために、次のライブラリを作成しました。

https://github.com/prine/ROThumbnailGenerator

使い方は非常に簡単です：var thumbnailImage = ROThumbnail.getThumbnail(url)

内部には3つの異なる実装があり、ファイル拡張子に応じてサムネイルを作成します。別のファイル拡張子のサムネイル作成者が必要な場合は、独自の実装を簡単に追加できます。

1
Prine

Swift 2.1必要な時間間隔でサムネイルを取得する

func getPreviewImageForVideoAtURL(videoURL: NSURL, atInterval: Int) -> UIImage? {
    print("Taking pic at \(atInterval) second")
    let asset = AVAsset(URL: videoURL)
    let assetImgGenerate = AVAssetImageGenerator(asset: asset)
    assetImgGenerate.appliesPreferredTrackTransform = true
    let time = CMTimeMakeWithSeconds(Float64(atInterval), 100)
    do {
        let img = try assetImgGenerate.copyCGImageAtTime(time, actualTime: nil)
        let frameImg = UIImage(CGImage: img)
        return frameImg
    } catch {
        /* error handling here */
    }
    return nil
}
1
manoj kumar

「fileURLWithPath」を「URLWithString」に変更すると、URLからサムネイル画像が取得されます。

私の場合、このように機能しました。

NSURL *url = [NSURL URLWithString:filepath];
AVAsset *asset = [AVAsset assetWithURL:url];
AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
CMTime time = [asset duration];
time.value = 0;
CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:NULL];
UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);

return thumbnail;
0
Virendra Patil

スイフト4

func generateThumbnail(for asset:AVAsset) -> UIImage? {
    let assetImgGenerate : AVAssetImageGenerator = AVAssetImageGenerator(asset: asset)
    assetImgGenerate.appliesPreferredTrackTransform = true
    let time = CMTimeMake(value: 1, timescale: 2)
    let img = try? assetImgGenerate.copyCGImage(at: time, actualTime: nil)
    if img != nil {
        let frameImg  = UIImage(cgImage: img!)
       return frameImg
    }
    return nil
}

使い方：

   func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    picker.dismiss(animated: true) {

        switch mediaType {
        case kUTTypeMovie:
            guard info[UIImagePickerController.InfoKey.mediaType] != nil, let url = info[UIImagePickerController.InfoKey.mediaURL] as? URL else { return }
            let asset = AVAsset(url: url)
            guard let img = self.generateThumbnail(for: asset) else {
                print("Error: Thumbnail can be generated.")
                return
            }
            print("Image Size: \(img.size)")
            break
        default:
            break
        }
    }
}
0
Rajender Kumar