[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 #12 from sreerenj <bsreerenj at gmail.com> 2013-04-30 08:35:13 UTC ---
We can only specify the chroma type (4:2:0, 4:2:2 or 4:4:4) during vaSurface
creation. Then the h/w is selecting it's best format(NV12, YV12 etc) for a
specific chromatype. We have no control over it. Thats why i said, "we will
have got the surface format by the time it finishes the decoding of first
buffer"

During system memory mapping: There are ways to (vaDeriveImage API in libva)
derive the surface data with out any colorspace conversion. It will retrieve
the underline surface data as it is.

Is it clear now? Or Gwenole can explain it in a better way if needed :)

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