[Bug 783803] encoder: h264(AVC): Add multi reference support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783803

--- Comment #2 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Hyunjun Ko from comment #1)

The question here is: How we interpret the number of future reference frames if
there are B frames encoded. right?

A:
The simple scenario is what you mentioned in \1.
Option \2 will create confusion, So I won't prefer even though that is what
intel-vaapi-driver is doing.

B:
Look what x264enc is doing if we set "ref=n" and do the same with hw encoder.

c:
Third option: You can add different algorithms and enable them based on a
property. For eg: See how vaapivp9enc implemented the "ref-pic-mode". Here we
can enable "multi-ref-b" as one of the options.
You can take few patches from here I
believe:https://cgit.freedesktop.org/~sree/gstreamer-vaapi/log/?h=advanced_enc
Specifically this one:
https://cgit.freedesktop.org/~sree/gstreamer-vaapi/commit/?h=advanced_enc&id=338e5d3a54f660acd628e4eeff336312c93bf0d8

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