Hi, please find attached a patch that just adds the gstreamer init call to the replaygain plugin. I had Rhythmbox play a couple of songs containing replaygain tags with the patched plugin and the issue seems to be fixed.
Cheers - Fuddl
Index: rhythmbox-3.4.1/plugins/replaygain/player.py
===================================================================
--- rhythmbox-3.4.1.orig/plugins/replaygain/player.py 2017-02-22 09:22:04.921287438 +0100
+++ rhythmbox-3.4.1/plugins/replaygain/player.py 2017-02-22 09:22:41.656810882 +0100
@@ -44,6 +44,7 @@
# make sure the replaygain elements are available
missing = []
required = ("rgvolume", "rglimiter")
+ Gst.init([]);
for e in required:
if Gst.ElementFactory.find(e) is None:
missing.append(e)
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