[Bug 764396] Add GST_EVENT_LATENCY_CHANGED

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764396

--- Comment #7 from Håvard Graff (hgr) <havard.graff at gmail.com> ---
 > > I really see this as a useful "puzzle piece", not as a complete
> > implementation in itself. Like, some elements maintain an internal
> > "upstream_latency" variable (like the jitterbuffer), upon receiving this
> > event, it would always be a good idea to re-query for the new value here.
> 
> Indeed, this would make aggregator a bit more reliable in that regard as it
> could query by itself instead of assuming that the application triggers
> complete latency recalculation.

Which is exactly the use-case we have right now!


> Note that stream-start events also have something called group-id. Which
> generally refers to a collection of streams that somehow should be
> synchronized together. Currently used by playbin for group the main media
> and an external subtitle stream together, and for distinguishing one of
> these "stream groups" from the next one that would appear when you switch to
> the next media.

"latency-group", "synchronization-group", "sync-group", "sync-group-id" ? :)

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