Bug#683919: Can't use the final version of opus

[Sjoerd Simons]

On Mon, 2012-08-06 at 05:37 +0930, Ron wrote:
> 
> If you can crash it, an example of how to reproduce that would probably
> be really helpful.

e.g:
http://cgit.freedesktop.org/gstreamer/gst-plugins-bad/commit/?h=0.10&id=722b15abcaadbf32542184df889ed06d7a01f8fe

This fixes hitting an assertion when the opus header is not recognized.
Slomo is aware about the patches that are needed for the opus support in
our gstreamer to become "release-quality", so this should hopefully be
fixed soon :)