decklinkvideosrc: Add property to allow posting error for no-signal frame
Add "max-no-signal-frames" property for decklinkvideosrc to be able to post error message if the number of consecutive no-signal frames exceeds user-specified one.
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Add "max-no-signal-frames" property for decklinkvideosrc to be able to post error message if the number of consecutive no-signal frames exceeds user-specified one.