解决办法:
Looks like this is an issue on certain devices on iOS 8.3+. It works for me on almost all devices but the iPad mini 2 fails for me as well. The short of it is that there's nothing wrong with the call itself. Seems to be an Xcode bug with those devices for some reason. You can get around it (until Apple fixes it) by:
In Xcode, go to Product -> Scheme -> Edit Scheme ... And for the Run Debug configuration (on left side) choose "Options" (on right side) and configure "GPU Frame Capture" as Disabled.
For more information, check out this thread:
https://github.com/BradLarson/GPUImage/issues/2022#issuecomment-118943746
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