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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #18 from sreerenj <bsreerenj at gmail.com> ---
I think there is a confusion in the interpretation of the field "framerate"
here:

We need a clarification on the interpretation of fps:

If "fps" field in a decoder OR parser output caps supposed to represent:

A)"actual output framerate in the display", then a fix needed in
GStreamer-vaapi. Don't double the framerate.

B)"output framerate(not field-rate) producing by the parser/decoder", then a
fix needed in parser/decoder to make the fps as half of field-rate.


C)"output field-rate producing by the parser/decoder", then a fix needed in
GStreamer-vaapi, Don't double the framerate. But we need a documentation in
GStreamer explaining "field-rate represents the framerate".


Note: Upstream gst-MSDK won't duplicate the fps, because it requires the field
rate as input framerate(which is what the parser is providing and inherited to
decoder too) and actual frame rate as output framerate (which is equal to
field-rate).

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