[Bug 761489] [matroskademux] fails to parse opus ('audio/x-unknown, codec-id=(string)A_OPUS')

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761489

--- Comment #7 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> ---
Created attachment 320416
  --> https://bugzilla.gnome.org/attachment.cgi?id=320416&action=edit
make up an OpusHead block from caps

This patch creates a OpusHead block from caps, if no stream header is present.

This should be all that's needed, except a test case here shows incoming caps
have 0 channels. I'm not sure how that's valid in the first place, so there's a
bit more debugging to be had.

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