[Bug 687183] playbin: caps negotation if VIDEO_FORMAT is unknown

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=687183
  GStreamer | gst-plugins-base | git

--- Comment #14 from Sebastian Dröge <slomo at circular-chaos.org> 2013-06-06 14:00:10 UTC ---
Ok, so after talking to Wim it is allowed to do an allocation query before caps
are set and even without caps inside the query. That's what you could do.

However that means in autoplugging scenarios that you won't get your queries
answered at all because downstream is only linked when the caps are known.

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