Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Audio / video Media Implementation.
+
+Provides per-platform implementations of multimedia functionality.
+Currently no stream API is provided, only a URI based one, so
+streaming has to be wrapped around it via temp files.
+
+Also provides (in `source/framework/mediacontrol.cxx`) an implementation
+of the graphical media playback control that appears in the toolbar /
+mediaobject bar when media is selected under the `.uno:AVMediaToolBox`
+item.
+
+## avmedia / gstreamer
+
+The `avmedia` component is implementation of manager service defined in
+`offapi/com/sun/star/media/`. Radek has added implementation based on
+gstreamer so that we can add audio and video files into impress
+presentation on Linux with gstreamer.
+
+The implementation is pretty straightforward, sometimes it has
+problems when gstreamer installation is incomplete.
+
+In the beginning the media files were not embedded, Thorsten added
+support for that later.
+
+## Future Works
+
+it might be worthwhile to revamp the avmedia UI.