[Bug 788510] decklink: Add read-only property to read the device serial number

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788510

Vivia Nikolaidou <vivia at ahiru.eu> changed:

           What    |Removed                     |Added
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                 CC|                            |vivia at ahiru.eu

--- Comment #3 from Vivia Nikolaidou <vivia at ahiru.eu> ---
This returns an empty string. It is correct (!)

It's not returning a serial number, despite the misleading API call. It is
returning a user-supplied label. The user can launch the vendor-supplied
utility and give the card a label through that utility, and then this label
will be returned with this API call. If the user hasn't supplied a label yet,
it will return an empty string.

This is still useful for our use case, but it's still pending a proper test -
we haven't yet supplied a label to see if we'll get it back, and we also
haven't tested to see how persistent it is (does it survive reboots? does it
survive moving the card to another computer?)

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