I am the person who originally reported this bug and I continue to be unable to edit m4a tags with Rhythmbox. I appear to have qtdemux installed on my 14.04 system (although I did nothing to explicitly install it) so perhaps qtdemux (or its absence) is not causing this bug. I ran "gst-inspect qtdemux" and it said qtdemux is in /usr/lib/x86_64 -linux-gnu/gstreamer-0.10/libgstisomp4.so, which indeed exists on my computer and seems to include qtdemux.
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