The plugin id3v2mux only writes ID tags in version 2.4. If your hardware MP3 player doesn't see properly the track, artist and album names it could be because it doesn't support 2.4 tags. The most portable format for ID tags is 2.3, at the moment gstreamer doesn't support this format.
There's a new plugin in gstreamer's bugzilla that adds support for IDv2.3. If you want to try it the instructions are available in the bug comment:
http://bugzilla.gnome.org/show_bug.cgi?id=459226
Simply download the .tar.gz attached to the bug and follow the instructions in README.txt.
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