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POI cannot get a precise CMTime for Generating Still Image from 1.8 second Video
 

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  1. POI cannot get a precise CMTime for Generating Still Image from 1.8 second Video
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    <p>Every time I try to generate a still frame from my video asset, it is generated at a time of 0.000.. seconds. I can see this from my log message. The good thing is that I can get the image at time 0.000.. to show up in a UIImageView called "myImageView." I thought the problem was that AVURLAssetPreferPreciseDurationAndTimingKey was not set, but even after I figured out how to do that, it still does not function..</p> <p>Here is what I have..</p> <p>time, actualTime, and generate are declared in the Header</p> <pre><code>NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"Documents/videoTest4.m4v"]]; //UISaveVideoAtPathToSavedPhotosAlbum(path, self, @selector(video:didFinishSavingWithError:contextInfo:), nil); NSURL *url = [NSURL fileURLWithPath:path]; NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:AVURLAssetPreferPreciseDurationAndTimingKey]; AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:url options:options]; Float64 durationSeconds = CMTimeGetSeconds([asset duration]); generate = [[AVAssetImageGenerator alloc] initWithAsset:asset]; NSError *err = nil; time = CMTimeMake(600,600.0); CGImageRef imgRef = [generate copyCGImageAtTime:time actualTime:&amp;actualTime error:&amp;err]; UIImage *currentImg = [[UIImage alloc] initWithCGImage:imgRef]; myImageView.image = currentImg; NSLog(@"The total Video Duration is %f",durationSeconds); NSLog(@"The time I want my image is %f",CMTimeGetSeconds(time)); NSLog(@"The actual time my image was take was %f",CMTimeGetSeconds(actualTime)); </code></pre> <p>And my Console reads.. </p> <p>2011-04-28 18:49:59.062 videoTest[26553:207] The total Video Duration is 1.880000</p> <p>2011-04-28 18:49:59.064 videoTest[26553:207] The time I want my image is 1.000000</p> <p>2011-04-28 18:49:59.064 videoTest[26553:207] The actual time my image was take was 0.000000</p> <p>..........................</p> <p>Thank you guys so much in advance.. :)</p>
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    1. COI just tested a 6 second clip.. When I request image at 2 seconds, I still get my image at 0.00.. when I request image at 4 seconds, I finally get an image at 5.003 seconds! So my code is working, I just need much more precision!!
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