[Bug 771382] New: dvbsuboverlay: map with READWRITE for overlay blend

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=771382

            Bug ID: 771382
           Summary: dvbsuboverlay: map with READWRITE for overlay blend
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vjaquez at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Just as in basetextoverlay [1], the frame to blend with the subtitles overlay
should be mapped with flags GST_MAP_READWRITE, because
gst_video_overlay_composition_blend() does both operations.

1. https://cgit.freedesktop.org/gstreamer/gst-plugins-base/commit/?id=1396f804

Signed-off-by: Víctor Manuel Jáquez Leal <vjaquez at igalia.com>

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