What package to file bug report about gstreamer?

[Emilio Jesús Gallego Arias <egallego@telefonica.net>]

Hi,

After upgrading gstreamer plugins to 0.8.4 in sid, I cannot play any mp3
file, neither in Rhythmbox or totem-gstreamer(which I installed to
confirm bug) with the following msg: 

"There is no element present to handle the stream's mime type
application/x-id3."

I've done gst-register0.8 as my user, as root, downgraded to 0.8.3 and
done gst-register again, but the bug persists.

What package should I file the bug report to? 
gst-plugins, gst-mad?

TIA, Emilio