[Bug 764396] Add GST_EVENT_LATENCY_CHANGED

[GStreamer (GNOME Bugzilla)]

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

--- Comment #6 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Håvard Graff (hgr) from comment #4)

> 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.

(In reply to Håvard Graff (hgr) from comment #4)
>
> As an idea, if we now added a property to base-sink, "group-id"

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.

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