examples: keep a ref on the buffer instead of the memory
examples: keep a ref on the buffer instead of the memory

Like in eglglessink

https://bugzilla.gnome.org/show_bug.cgi?id=726107

renesas-rcar/gst-omx,ismelykh/gst-omx-deinterlace,varunkumara/test-repo,CapOM/gst-omx,renesas-rcar/gst-omx,GStreamer/gst-omx,varunkumara/test-repo,GStreamer/gst-omx,pliu6/gst-omx,CapOM/gst-omx,surround-io/gst-omx,varunkumara/test-repo,CapOM/gst-omx,leio/gst-omx,freedesktop-unofficial-mirror/gstreamer__gst-omx,surround-io/gst-omx,ismelykh/gst-omx-deinterlace,renesas-rcar/gst-omx,GStreamer/gst-omx,pliu6/gst-omx,freedesktop-unofficial-mirror/gstreamer__gst-omx,leio/gst-omx