[Bug 741751] mssdemux: use correct type for setting bitrate

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741751
  GStreamer | gst-plugins-bad | unspecified

--- Comment #4 from Rajat Verma <kameyameha at gmail.com> 2015-01-06 04:31:10 UTC ---
I was testing mssdemux support in gstreamer and encountered a crash because of
this.

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