[Bug 687183] New: playbin enhancement: 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

           Summary: playbin enhancement: caps negotation if VIDEO_FORMAT
                    is unknown
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: bsreerenj at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


There is no way we can force a HW decoder like vaapidecoder to decode into a
specific format.The h/w is selecting it's best format for a specific
chromatype(which we can specify, 4:2:0, 4:2:2 or 4:4:4).If i understood
correctly, all the gstreamer video decoders should set the GST_VIDEO_FORMAT to
the caps during the negotiation.

In case of vaapi, we will get the decoded_video_format from the vasurface which
has data rendered by the driver.So there is no way to get the
DECODER_OUTPUT_VIDEO_FORMAT until we finish the decoding of one buffer at
least.So IMHO we need a better negotiation approach to handle this 
in gstreamer-1.0.

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