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I'm using this code to load the values of key and play movie url.

[asset loadValuesAsynchronouslyForKeys:requestedKeys completionHandler:
     ^{                  
         dispatch_async( dispatch_get_main_queue(), 
                        ^{                                                          
                            [self prepareToPlayAsset:asset withKeys:requestedKeys];
                        });
     }];

But sometimes the method prepareToPlayAsset cannot be run and i don't know why. Someone know the reason?

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