Rhythmbox Errors

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http://unix.stackexchange.com – Hi I have a question about Rhythmbox. I play a lot of .ra or .rm files (big Doo Wop fan). It plays fine but when I try to edit with the property box it says: Error while saving song information Could not multiplex stream. But it works fine with other file types. My system is Mint 12 (32bit) with Cinnamon desk top, and 2.90.1 Rhythmbox 2.90.1 (HowTos)