获取*.mov视频IOS的缩略图

Question

我想获得一个用iPhone/iPAD拍摄的视频缩略图(*.mov).我试图使用AVFoundation库并得到此错误:

couldn't generate thumbnail, error:Error Domain=AVFoundationErrorDomain Code=-11822 "Cannot Open" UserInfo=0x15d90a30 {NSLocalizedDescription=Cannot Open, NSLocalizedFailureReason=This media format is not supported.}

码:

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDir=[paths objectAtIndex:0];
NSString *videoPath=[documentDir stringByAppendingPathComponent:[NSString stringWithFormat:@"videos/%@.mov",videoName]];


    AVURLAsset *asset=[[AVURLAsset alloc] initWithURL:videoPath options:nil];
    AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
    generator.appliesPreferredTrackTransform=TRUE;

    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);
        }
        self.img.image=[UIImage imageWithCGImage:im];
    };

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

我用我的应用程序录制了视频,并希望显示它们的缩略图.

Answer 1

这是......(从这个链接中选择 - 获取缩略图的视频快照)

- (UIImage *)thumbnailImageFromURL:(NSURL *)videoURL {
    AVURLAsset *asset = [[AVURLAsset alloc] initWithURL: videoURL options:nil];
    AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
    NSError *err = NULL;
    CMTime requestedTime = CMTimeMake(1, 60);     // To create thumbnail image
    CGImageRef imgRef = [generator copyCGImageAtTime:requestedTime actualTime:NULL error:&err];
    NSLog(@"err = %@, imageRef = %@", err, imgRef);

    UIImage *thumbnailImage = [[UIImage alloc] initWithCGImage:imgRef];
    CGImageRelease(imgRef);    // MUST release explicitly to avoid memory leak

    return thumbnailImage;
}