[Bug 796984] vaapih265enc: Support hevc encode low latency B frame.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796984

--- Comment #22 from Fei <fei.w.wang at intel.com> ---
(In reply to Víctor Manuel Jáquez Leal from comment #19)
> (In reply to sreerenj from comment #18)
> > Review of attachment 373450 [details] [review] [review]:
> > 
> > ::: gst-libs/gst/vaapi/gstvaapiencoder_h265.c
> > @@ +1721,1 @@
> >        for (; i_ref < reflist_1_count; ++i_ref) {
> > 
> > Will reflist_1_count be always zero here for any P picture ?
> > (https://bugzilla.gnome.org/show_bug.cgi?id=796984#c17)
> 
> Sree hit something important, what would be the behavior of this property
> when the property max-bframes is zero (the default value, by the way)

Yes, low latency B's ref_pic_list1 should keep same with ref_pic_list0 of P
frame but not B frame. I will fix this in my  next patch.

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