[Bug 797100] New: videoaggregator: allocation query management makes buffering suboptimal when using dynamic/live pipelines

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797100

            Bug ID: 797100
           Summary: videoaggregator: allocation query management makes
                    buffering suboptimal when using dynamic/live
                    pipelines
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: blocker
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: tsaunier at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Since we implemented downstream allocation negotiation support in Bug 746529,
reconfiguring videoaggregator/compositor blocks downstream on the allocation
query (basically until the queued data has been processed) meaning that no
further data processing can happen meanwhile. That makes queuing way less
effective and in NLE/Pitivi for example it leads to bad "perfs". We should find
a way to make renegotiation happen as soon as required and not block that way
downstream.

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