[Bug 757548] aggregator: Forced to produce data in paused state

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757548

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
(In reply to Sebastian Dröge (slomo) from comment #3)
> Comment on attachment 325883 [details] [review]
> This is really a tentative patch, I didn't go around everything to make sure
> 
> While it generally seems like a good idea, this should break something.
> Consider the case where you have e.g. a compositor in a live pipeline and no
> inputs linked to it provided the STREAM_START event yet until a later time.
> You still might want the compositor to output empty background frames
> whenever the timeout triggers, as it does right now.

This use case didn't work before. There is no way to make an aggregator go live
without any pads being linked. I think for the automatic detection of a
pipeline being live, this is closer to being correct, but only a property can
let you cover everything.

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