[Bug 781776] decklink: Detect gaps on incoming stream times, issue warnings

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781776

--- Comment #1 from Vivia Nikolaidou <vivia at ahiru.eu> ---
Created attachment 350492
  --> https://bugzilla.gnome.org/attachment.cgi?id=350492&action=edit
decklink: Detect gaps on incoming stream times, issue warnings

When we receive a video or audio buffer, we calculate the next stream
time based on the current stream time + buffer duration. If the next
buffer's stream time is after that, we issue a warning.

This happens because the stream time incoming from Decklink should be
really constant and without gaps. If there is a gap, it means that
something went wrong, e.g. the internal buffer pool is empty (too many
buffers queued up downstream).

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