[Bug 744839] gl: Flickering when libav direct rendering doing playbin playback

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=744839

--- Comment #3 from Matthew Waters <ystreet00 at gmail.com> ---
This fixes the flickering although we're still displaying late.

commit a4040f2ee9437c732f1b488ef8b398f96335f64a
Author: Matthew Waters <matthew at centricular.com>
Date:   Fri Feb 20 18:42:23 2015 +1100

    glememory: only store and act on the map flags on first/last map/unmap

    Anytime else, we have no idea how to match up map and unmaps.
    We also don't know exactly how the calling code is using us.
    Also fixes the case where we're trying to transfer while someone else
    is accessing our data pointer or texture resulting in mismatched video
    frames.

    https://bugzilla.gnome.org/show_bug.cgi?id=744839

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