Exception：调用nativeConnect返回值：-50

[hebeisuhe]

相机型号 尼康D7100

onConnectDev 方法成功回调了，之后报下面的错误

com.serenegiant.usb.UVCCamera.open(UVCCamera.java:217)
com.serenegiant.usb.common.AbstractUVCCameraHandler$CameraThread.handleOpen(AbstractUVCCameraHandler.java:517)
com.serenegiant.usb.common.AbstractUVCCameraHandler.handleMessage(AbstractUVCCameraHandler.java:360)
android.os.Handler.dispatchMessage(Handler.java:117)
android.os.Looper.loopOnce(Looper.java:205)
android.os.Looper.loop(Looper.java:293)
com.serenegiant.usb.common.AbstractUVCCameraHandler$CameraThread.run(AbstractUVCCameraHandler.java:1053)
exception：open failed:result=-50----->id_camera=474887915904;venderId=1200;productId=1072;fileDescriptor=157;busNum=2;devAddr=2;usbfs=/dev/bus/usb
Exception：调用nativeConnect返回值：-50

[quantum6]

On my knowledge, the protocol of nicon is not supported.