[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 #16 from Sebastian Dröge <slomo at circular-chaos.org> 2013-06-06 14:54:39 UTC ---
(In reply to comment #15)
> (In reply to comment #14)
> > 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.
> >
> 
> Does it meant to negotiate a pool with out setting output video format from
> decoder (and invoke gst_video_decoder_set_output_fromat() after we finishes the
> decoding of first buffer)? or to set the o/p format to
> GST_VIDEO_FORMAT_ENCODED?

Yes, not ENCODED. Will need changes to the base class though as it currently
requires to have a format set before negotiating a pool.

> Then i worried that it will lead to buffer-pool re-negotiation again..

Can happen, yes

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