How to get video attributes in iOS8 share extension - ios

Question

I am trying to create a sharing extension to share videos using the new iOS 8 app extensions.I want to open the photo app and share the video by my extension.
I get the video url by following codes:
NSExtensionItem *inputItem = self.extensionContext.inputItems.firstObject;
NSItemProvider *provider = inputItem.attachments[0];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), ^{
if ([provider hasItemConformingToTypeIdentifier:(NSString *)kUTTypeQuickTimeMovie])
{
[provider loadItemForTypeIdentifier:#"com.apple.quicktime-movie" options:nil completionHandler:^(NSURL *path,NSError *error){
if (path)
{
dispatch_async(dispatch_get_main_queue(), ^{
_moviePath = path;
});
}
}];
}
});
But I only got the video file url:
file:///var/mobile/Media/DCIM/100APPLE/IMG_0062.MOV
I also want to get more video attributes ,like: size and duration
I used following codes,but not work:
NSDictionary *opts = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:_moviePath options:opts];
int second = urlAsset.duration.value / urlAsset.duration.timescale;
and this code:
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:_moviePath];
CMTime duration = playerItem.duration;
float seconds = CMTimeGetSeconds(duration);
NSLog(#"duration: %.2f", seconds);
they are all do not work
and xcode tips:
Error [IRForTarget]: Call to a symbol-only function 'memset' that is not present in the target
error: 0 errors parsing expression
error: The expression could not be prepared to run in the target
You can help me to get the video attributes?Thank you very much!

Answer 1

Now the following codes do working:
NSDictionary *opts = [NSDictionary
dictionaryWithObject:[NSNumber numberWithBool:NO]
forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:_moviePath options:opts];
int second = urlAsset.duration.value / urlAsset.duration.timescale;
And I don't know Why it does not work before！