[Bug 764930] New: videomixer can not set opaque texture when its formats is AYUV.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764930

            Bug ID: 764930
           Summary: videomixer can not set opaque texture when its formats
                    is AYUV.
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: anthony.violo at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When you have 2 inputs in AYUV format go to videomixer, when you make a texture
opaque, this one is never completely opaque.
Exemple in pipeline follow:

gst-launch-1.0 videotestsrc pattern=4 ! "video/x-raw, width=(int)426,
height=(int)478, format=(string)AYUV" ! videomixer background=2
sink_0::xpos=800 sink_0::ypos=200 sink_1::zorder=2 sink_0::zorder=1
sink_1::alpha=1.0 name=videomixer ! videoconvert ! xvimagesink videotestsrc
pattern=2 ! videoscale ! videoconvert ! "video/x-raw, width=(int)1280,
height=(int)720, format=(string)AYUV" ! videomixer.

In this exemple, when have a black texture or videomixer set opaque
(sink_1::alpha=1.0) but in the result whe can see a block red in background.

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