Bumblebee 2 only has the right camera image in Mac system

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Hi, I use Mac (10.9.5) system and libdc1394 lib to capture the stereo image from Bumblebee 2. But it only has the right image. I list the modes: Mode: DC1394_VIDEO_MODE_1024x768_RGB8 Frame Rates: [0] rate = 1.875000 [1] rate = 3.750000 [2] rate = 7.500000 [3] rate = 15.000000 Mode: DC1394_VIDEO_MODE_1024x768_MONO8 Frame Rates: [0] rate = 1.875000 [1] rate = 3.750000 [2] rate = 7.500000 [3] rate = 15.000000 [4] rate = 30.000000 Mode: DC1394_VIDEO_MODE_1024x768_MONO16 Frame Rates: [0] rate = 1.875000 [1] rate = 3.750000 [2] rate = 7.500000 [3] rate = 15.000000 [4] rate = 30.000000

All of them are the right image. I think it maybe because the Mac does not have the driver (point grey only support linux and windows), so that the system treats the stereo camera just as a monocular camera. Is there any place that I can download the driver? Or I have to do some figuration so that the libdc1394 can find the left camera?

Thanks.