[Bug 796979] New: decklinkvideosrc: Respect pixel format property even if mode is set to auto

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796979

            Bug ID: 796979
           Summary: decklinkvideosrc: Respect pixel format property even
                    if mode is set to auto
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: oss at nvl.army.mil
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I got hung up for several hours trying to debug why I couldn't get 10-bit YUV
(v210) from an SDI source via a Decklink Extreme 12G card. Turns out 8-bit YUV
will always be used if the mode is set to AUTO. Eventually I noticed a warning
about this issued in gstdecklinkvideosrc.cpp:1221, "Warning: mode=auto and
format!=auto may not work" (I know, I should have noticed this warning in the
debug output sooner).

I created a patch which seems to fix this, and might hopefully save future
users some frustration

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