[Bug 98005] VCE dual instance encoding inconsistent since st/va: enable dual instances encode by sync surface

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Comment # 18 on bug 98005 from
(In reply to Andy Furniss from comment #14)
> but I am afraid the patches regress cbr so the out of order frames near I frames issue is back.

The "out of order" issue was caused by sending last p and next i frame together
for dual instance encoding, which has already been solved and shouldn't affect
by this patch. I suspect the i-frame has less QP (quality) than p-frame in cbr
case (to meet constant bit-rate) where bit-rate is not high enough, as a result
you might see low picture quality for each i-frame. Please confirm with high
bitrate or using analyser to check the order.

If you still see the out-of-order issue, please share the clip and command.

Thanks


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