[Bug 684981] Pipeline hangs on PREROLLING negotiating caps

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=684981
  GStreamer | gstreamer (core) | 1.0.0

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|HEAD                        |1.0.1

--- Comment #6 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2012-09-29 13:45:43 UTC ---
I think it's the right thing to do as well, and I hope the positive effects of
keeping the list small right away will outweigh the negatives overall:


commit 507fc9cea7d587446fba08dfeac7e063e14c680e
Author: Tim-Philipp Müller <tim.muller at collabora.co.uk>
Date:   Sat Sep 29 14:35:58 2012 +0100

    value: avoid duplicates when intersecting lists

    Fixes negotiation taking a ridiculous amount of
    time (multiple 10s of seconds on a core2) when
    there are duplicate entries in lists.

    Could have a negative performance impact on other
    scenarios because we now have to iterate the
    dest list to avoid duplicates, but we don't
    have a lot of lists any more these days, and
    they tend to be small anyway. The negatives
    are hopefully countered by the positive effects
    of reducing the list length early on in the
    process. And in any case, it's the right thing
    to do.

    Based on patch by Andre Moreira Magalhaes.

    https://bugzilla.gnome.org/show_bug.cgi?id=684981

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