[Bug 745197] pad: Don't fail latency query on unlinked pads

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745197

Olivier Crête <olivier.crete at ocrete.ca> changed:

           What    |Removed                     |Added
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                 CC|                            |olivier.crete at ocrete.ca

--- Comment #4 from Olivier Crête <olivier.crete at ocrete.ca> ---
For srtpdec, it should follow the internal links, so are you linking the
srcpad, but not the matching sink pad? For this use-case, I don't think this
change should be required.

For the other n->1 elements (aggregator, input-selector, etc), they should
probably post latency messages on the bus when the first buffer arrives on a
new pad. Possibly toplevel GstBin should drop latency messages when they're not
in the playing state if we start posting more of them.

I've had issues recently with pipelines including audiomixer where the latency
didn't get re-computed when modifying a playing pipeline.

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