[Bug 781069] postproc: framerate should not be always duplicated

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781069

Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> changed:

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                 CC|                            |nicolas at ndufresne.ca

--- Comment #19 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
In gstreamer caps, the framerate field is always frames. So the parser helper
gst_h264_video_calculate_framerate() returns a framerate (it will half the SPS
framerate).

Though, if I understood correctly, for scalerbob technique, if you don't double
the rate, it means we will likely scale up all top fields, or all bottom
fields, dropping the other fields. Is that what MSDK VPP implementation do ?
This would obviously remove shakyness.

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