[Bug 780367] decklinkvideosrc: Add no-signal property

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=780367

--- Comment #5 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
> Currently, a warning or info is posted when a signal is lost or connected.
> (With GST_ELEMENT_WARNING or GST_ELEMENT_INFO)

I think this should be some other kind of message (status/progress message).

> But there is no way to query the current signal status if the message was
> missed for some reason. If someone wants to know the signal status at some
> point of time, I find a property much more convenient than installing a
> message handler.

That is true. But this is all API for application developers. They know in
advance whether they will be interested in this or not, and if they are, they
will simply look for the messages and track state this way. It's not like the
code suddenly changes its mind after running for a while :)

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