VP9 K-SVC support

[DaveHu-TVU]

I downloaded the code of the latest libva and found that it doesn't search any field related to VP9 SVC. Does the latest libva version support VP9 SVC? thanks!

[DaveHu-TVU]

I have read the document https://www.intel.com/content/www/us/en/developer/articles/technical/support-va-api-vp9-k-svc-encoding-on-chromeos.html and this document which describes the basic process of encoding VP9 K-SVC with VAAPI, so I would like to find out more about the VAAPI VP9 K-SVC

[XinfengZhang]

VP9 SVC is handled by application , libva+media driver only provide support of DRC (dynamic resolution change) , it means , you could change the resolution in a sequence . it then provide the opportunity to enable SVC by spatial and temporal layer enabling. so, you could use different resolution for different layer in one sequence.

[DaveHu-TVU]

thanks for your reply.

you could change the resolution in a sequence
-----> it means, there are different resolutions in a sequence? with one encoder pipeline?

[XinfengZhang]

yes, it means, smaller resolution picture could be reference of bigger resolution picture, change resolution without an IDR frame.

[DaveHu-TVU]

Thanks, does vpl or msdk have a sample with vp9 k-svc?
and do you have more documents about VP9-KSVC? if K-SVC requires application handling, I need to know more details.

[XinfengZhang]

AFAIK, there are no sample in msdk or vpl. the link you pasted before include one 3x3 description.
3 layers spatial scaling and 3 temporal layers

[DaveHu-TVU]

Hi @XinfengZhang , I found the mfxExtVP9TemporalLayers in https://intel.github.io/libvpl/v2.10/API_ref/VPL_structs_encode.html#_CPPv4N23mfxExtVP9TemporalLayers5LayerE,
it means, vpl had supported TemporalLayer and can't support SpatialLayer, right?