As of last year when I left Apple, the OS X driver (VDCAssistant) did not 
support more than one video interface association descriptor.  I would be 
surprised if that has changed.

- Fernando

> On May 31, 2015, at 7:34 AM, [email protected] wrote:
> 
> 
> Hi
> 
> We have two video Interface association descriptors in one Usb device.
> On Mac OS X 10.10, only the first video interface is enumerated by 
> AVFountation and its low level media stack. 
> 
> So is there some method that make the second video interface be enumerated? 
> Or we must implement a user space driver (a DAL plugin) for the specific usb 
> device with 2 video IAD?
> 
> Thanks
> Clark
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