[Bug 777009] urisourcebin: Never push actual EOS event to slot

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777009

Jan Schmidt <thaytan at noraisin.net> changed:

           What    |Removed                     |Added
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 Attachment #343142|0                           |1
        is obsolete|                            |

--- Comment #16 from Jan Schmidt <thaytan at noraisin.net> ---
Created attachment 343145
  --> https://bugzilla.gnome.org/attachment.cgi?id=343145&action=edit
urisourcebin: Never push actual EOS event to slot

Due to the special nature of adaptivedemux, reconfigure happens
frequently with seek/track-change.
In very exceptional cases, the following sequence is possible:
  * EOS event is pushed to queue element and still buffers are queued
  * During draining remaining buffers, reconfiguration downstream
happens due to track switch.
  * The queue gets a not-linked flow return from downstream
  * Because the sinkpad is EOS, the queue registers an
    error on the bus, causing the pipeline to fail.

Avoid the sinkpad getting marked EOS in the first place, by using a
custom event in place of EOS.

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