+?(UIImage*)?thumbnailImageForVideo:(NSURL?*)videoURL?atTime:(NSTimeInterval)time?{??
????AVURLAsset?*asset?=?[[AVURLAsset?alloc]?initWithURL:videoURL?options:nil];??
????NSParameterAssert(asset);??
????AVAssetImageGenerator?*assetImageGenerator?=[[AVAssetImageGenerator?alloc]?initWithAsset:asset];??
????assetImageGenerator.appliesPreferredTrackTransform?=?YES;??
????assetImageGenerator.apertureMode?=?AVAssetImageGeneratorApertureModeEncodedPixels;??
????CGImageRef?thumbnailImageRef?=?NULL;??
????CFTimeInterval?thumbnailImageTime?=?time;??
????NSError?*thumbnailImageGenerationError?=?nil;??
????thumbnailImageRef?=?[assetImageGenerator?copyCGImageAtTime:CMTimeMake(thumbnailImageTime,?60)actualTime:NULL?error:&thumbnailImageGenerationError];??
????if(!thumbnailImageRef)??
????NSLog(@"thumbnailImageGenerationError?%@",thumbnailImageGenerationError);??
????UIImage*thumbnailImage?=?thumbnailImageRef???[[UIImage?alloc]initWithCGImage:?thumbnailImageRef]?:?nil;??
????return?thumbnailImage;??
}
