[Bug 796620] playbin2 flush doesn't travel upstream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796620

--- Comment #2 from James <jawilso3 at cisco.com> ---
TBH I'm not sure. The app currently sends the flush-start, flush-stop events to
the pipeline and with gstreamer 1.4 this sent the flush events to all elements
in the pipeline (including the appsrc). As of 1.6.1 this doesn't happen. So I'm
confused as to whether this is a bug in my app code that worked on 1.4 but
shouldn't have, or is this a bug in the playbin2 code?

--- Comment #3 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Flush events can go in both directions.

A demuxer's seek handler will (when operating in pull mode) typically send
flush upstream and downstream, for example, to unblock the streaming thread
(which might be stuck in a pull/read in the source or in a push downstream).

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