GPUImage2
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Fix framebuffer overrelease error due to async target counts for iOS
The frame buffers would not get updated due to the target counts being off from previous append calls. This can be reproduced by synchronous calls to processImage.
Thanks for this @justingra
This solution is on the right track but does not fully fix the issue. See https://github.com/BradLarson/GPUImage2/pull/243 for a proper fix.