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Whatever is causing this is very recent, it was working just a few days ago. I can still play musepack files through gstreamer via Quod Libet, but I used to be able to play them through MPD and audacious, too. I remember doing so as recently as a week ago or even less. Clueless as to what could be causing this...
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libmpcdec has been updated recently. Probably said apps need to be rebuilt (gstreamer0.10-musepack and xine-lib had been updated at the same time, that's probably why they decode mpc properly).
-edit-
Yeah, I've rebuilt audacious-plugins and now it works as it should. You might want to file a bug on flyspray (if it hasn't been done yet), requesting the rebuild of audio apps capable of decoding mpc.
Additionally, I noticed that mpc finally supports seeking. Yay.
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Thanks, rebuilding the packages fixed the issue and a bug had already been filed.
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