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2013-12-04T15:34:36.273
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You need to: <ol> <li>use CGImageRelease as @zimmryan mentioned</li> <li>use a block of @autoreleasepool in your loop </li> <li>do not store the images in the memory, store them in your Document Directory</li> </ol> This is how I do it: (notice I use the sync version for extracting images, it shouldn't matter if you choose the async version) <pre><code>AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:url options:nil]; AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset]; generator.requestedTimeToleranceAfter = kCMTimeZero; generator.requestedTimeToleranceBefore = kCMTimeZero; for (Float64 i = 0; i < CMTimeGetSeconds(asset.duration) * FPS ; i++){ @autoreleasepool { CMTime time = CMTimeMake(i, FPS); NSError *err; CMTime actualTime; CGImageRef image = [generator copyCGImageAtTime:time actualTime:&actualTime error:&err]; UIImage *generatedImage = [[UIImage alloc] initWithCGImage:image]; [self saveImage: generatedImage atTime:actualTime]; // Saves the image on document directory and not memory CGImageRelease(image); } } </code></pre> EDIT: you should always consider using @autoreleasepool when creating alot of temporary objects (see <a href="https://developer.apple.com/library/mac/documentation/cocoa/conceptual/memorymgmt/articles/mmAutoreleasePools.html" rel="noreferrer">https://developer.apple.com/library/mac/documentation/cocoa/conceptual/memorymgmt/articles/mmAutoreleasePools.html</a>) 
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