[Bug 797338] dshowvideosrc: add device-index, add GstDeviceMonitor, and several fixes

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797338

--- Comment #22 from Joshua M. Doe <oss at nvl.army.mil> ---
Review of attachment 374049:
 --> (https://bugzilla.gnome.org/review?bug=797338&attachment=374049)

Yes, several applications I've come across set empty strings instead of NULL,
and looking across other elements, many handle them equivalently.

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