[Bug 712328] matroskademux: Use GstVideoInfo helper to create caps for raw video

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=712328
  GStreamer | gst-python | unspecified

Thibault Saunier <thibault.saunier> changed:

           What    |Removed                     |Added
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             Blocks|                            |712290

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