hang

[pvinis]

sometimes i initialize the session the same way as the readme, and the ui hangs.
i checked the stack, and its in the [_captureSession addOutput:videoOutput]; line, in GPUImageVideoCamera.m.
if i surround that addOutput: in dispatch_async(dispatch_get_current_queue(), ^{ and }); it works.
how can i avoid that? is it something with the main thread?