JJ

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failed failed to launch - 100 tries exploit failed.

![img_2351](https://user-images.githubusercontent.com/12031454/52894131-c0957880-31df-11e9-8925-2077a917d0db.PNG)

[AVCaptureSession startRunning] should be called from background thread. Calling it on the main thread can lead to UI unresponsiveness

我也碰到这个问题，还在研究中