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POGenerating thumbnail from video - ios7
 

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  1. POGenerating thumbnail from video - ios7
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    <p>I am using this for reference: <a href="https://stackoverflow.com/a/6027285/1145339" title="Getting thumbnail from a video url or data in IPhone SDK">Getting thumbnail from a video url or data in IPhone SDK</a></p> <p>The method is using the MPMoviePlayerController class instead of the AVFoundation, and I think I want to use that as well because the people said that MPMoviePlayer way is faster than the AVFoundation way. </p> <p>The problem is, the method used to create the thumbnails, <code>[player thumbnailImageAtTime:1.0 timeOption:MPMovieTimeOptionNearestKeyFrame]</code> is deprecated in iOS 7.0.</p> <p>By looking at the apple docs, the remaining supported ways to create thumbnails are by the methods <code>(void)requestThumbnailImagesAtTimes:(NSArray *)playbackTimes timeOption:(MPMovieTimeOption)option</code> and <code>(void)cancelAllThumbnailImageRequests</code>. But, as the method signatures dictate, these methods return nothing. So how do I access the <code>UIImage</code> thumbnail created by these methods?</p> <p>If it helps, this is what I have so far in terms of code:</p> <pre><code> self.videoURL = info[UIImagePickerControllerMediaURL]; NSData *videoData = [NSData dataWithContentsOfURL:self.videoURL]; //Create thumbnail image MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:self.videoURL]; [player requestThumbnailImagesAtTimes:@[@1] timeOption:MPMovieTimeOptionNearestKeyFrame]; //UIImage *thumbnail = ??? </code></pre> <p>How do I get a UIImage reference to the thumbnail?</p> <p><strong>EDIT</strong> I figured out how to create a notification for the thumbnail image request (using <a href="https://stackoverflow.com/questions/14297726/cant-get-multiple-images-from-video-using-mpmovieplayercontroller-osstatus-12" title="Can&#39;t get multiple images from video using MPMoviePlayerController.">this question</a> as reference). However, I realise that this method works asynchronously from the main thread, and so my notification handler method doesn't seem to ever be called.</p> <p>This is what I have now.</p> <pre><code> self.videoURL = info[UIImagePickerControllerMediaURL]; NSData *videoData = [NSData dataWithContentsOfURL:self.videoURL]; MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:self.videoURL]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleThumbnailImageRequestFinishNotification:) name:MPMoviePlayerThumbnailImageRequestDidFinishNotification object:player]; [player requestThumbnailImagesAtTimes:@[@1] timeOption:MPMovieTimeOptionNearestKeyFrame]; </code></pre> <p>And then my handler method:</p> <pre><code>-(void)handleThumbnailImageRequestFinishNotification:(NSNotification*)notification { NSDictionary *userinfo = [notification userInfo]; NSError* value = [userinfo objectForKey:MPMoviePlayerThumbnailErrorKey]; if (value != nil) { NSLog(@"Error creating video thumbnail image. Details: %@", [value debugDescription]); } else { UIImage *thumbnail = [userinfo valueForKey:MPMoviePlayerThumbnailImageKey]; } </code></pre> <p>But the handler never gets called (or so it appears).</p>
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