[Bug 784831] Seeking a pipeline containing concat only seeks the latest source

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784831

--- Comment #6 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
(In reply to Mathieu Duponchelle from comment #5)
> (In reply to Nicolas Dufresne (stormer) from comment #3)
> > Well no, to support duration and seeking the pad request would need to be
> > frozen
> 
> Why?

Duration will change (not a big deal, but most app don't support that), it
would also be racy with the READY to PAUSED transition (hopefully seek will
fail, but it is also often unexpected by app).

(In reply to Sebastian Dröge (slomo) from comment #4)
> (In reply to Nicolas Dufresne (stormer) from comment #3)
> > I would make the seek ans duration query fail though, to avoid the unexpected.
> 
> You mean on the srcpad of concat? It intentionally works right now, proxying
> whatever information there is for the currently active pad.

Yes, though proxying will make it behave as if there was only 1 source. I sense
a behaviour break if someone implement seeking over all sources. All in all, if
you designed it this way, you should maybe document it (and maybe add tests if
not done already).

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