[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 #15 from sreerenj <bsreerenj at gmail.com> 2013-06-06 14:37:47 UTC ---
(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?

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

> 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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