vaapih264enc set quantizer runtime

[xrataj00]

Hello,

I am using vaapih264enc with Constant QP. I would like to change quantizer
during encoding without stopping the pipeline. I am able to change bitrate
in vbr mode but cqp mode is giving me better results. Is there any way?
Thanks. Tomas



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[Nicolas Dufresne-5]

Le lundi 13 mai 2019 à 08:46 -0500, xrataj00 a écrit :
> Hello,
>
> I am using vaapih264enc with Constant QP. I would like to change quantizer
> during encoding without stopping the pipeline. I am able to change bitrate
> in vbr mode but cqp mode is giving me better results. Is there any way?
> Thanks. Tomas

It would need to be implement in gstreamer-vaapi, that's all. The only
dynamic QP currently supported is the one ROI based.

>
>
>
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[xrataj00]

Using ROI would be even better for my application, thanks for pointing this
out. I have test it and it works only in CBR, is it somehow possible to set
QP for the whole scene and apply some delta QP for the ROIs? Thank you.

Seems that ROI for h264 is not working any more for SKL+. I guess I will have to stick with CQP for now. Thanks anyway

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[Nicolas Dufresne-5]

Le ven. 17 mai 2019 03 h 10, xrataj00 <[hidden email]> a écrit :

Using ROI would be even better for my application, thanks for pointing this
out. I have test it and it works only in CBR, is it somehow possible to set
QP for the whole scene and apply some delta QP for the ROIs? Thank you.

I didn't know about this limitation. It's probably VA driver specific. How the delta-qp works, is that you can set a default, default-delta-qp property, and on each ROI, you can override it, the ROI meta has a GstStructure, and you can set delta-qp field in it. The qp for the whole scene is also configurable, but won't work in constant quality mode I think (the default qp mode).

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[xrataj00]

OK, my fault. It is working in CQP mode too, the change was just too small to
notice. Anyway ROIs with h264 seems disabled in current vaapi drivers which
is making it useless for me now:

https://github.com/intel/intel-vaapi-driver/issues/108



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