missing element mp4mux

[Nux!]

Hello,

After upgrading my ffmpeg/x264 stack I'm getting errors about mp4mux 
and qtmux missing elements.
Can anyone offer some pointers, where should I look to get this fixed?

I'm using gstreamer-plugins-good 0.10.23, ffmpeg 0.10.4 and x264 0.120 
(on EL6). The problem did not exist when I was using older versions of 
ffmpeg/x264 so I'm guessing it must be something related to those.

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