I think you are using the V2 pacth the V3 pacth have this fixed

-DEPENDS = "gstreamer1.0 python3-pygobject"
-RDEPENDS_${PN} += "gstreamer1.0 python3-pygobject"
+DEPENDS = "gstreamer1.0 gstreamer1.0-plugins-base python3-pygobject"
+RDEPENDS_${PN} += "gstreamer1.0 gstreamer1.0-plugins-base python3-pygobject"