how to use vp9 to do svc encoding?

[andrew]

Hi,

I download vp9 with verion 1.5.0, and use the following command to build libvpx:

./configure --prefix=/usr/local/ --enable-shared --enable-experimental --enable-spatial-svc
make
make install

How to do vp9 svc encoding using vpxenc or other built binary, i.e. temporal scalability and spatial scalability?

Thanks!

B.R.

Andrew

[Marco Paniconi]

You can use the sample encoder: examples/vp9_spatial_svc_encoder

build with: ./configure --experimental --enable-spatial-svc

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[andrew wang]

I used the following command to do svc encoding:

./vp9_spatial_svc_encoder -f 300 -w 1280 -h 720 -b 2000 -sl 3 -k 250 -tl 3 --rc-end-usage=1 ./Google_I_O_2016-Keynote.yuv ./Google_I_O_2016-Keynote_t3_s3.vp9

300 frames are expected to be encoded, but about 270 frames are encoded indeed. And the original resolution is 1280x720. But neither of 3 resolutions in vp9 bitstream is 1280x720. Why?

Thanks!

[Marco Paniconi]

You need to set lag_in-frames=0, and set the spatial scale ratios.

Can you try:

examples/vp9_spatial_svc_encoder -f 300 -w 1280 -h 720 -b 2000 -k 250 --rc-end-usage=1 --lag-in-frames=0 --speed=5

-sl 3 -r 320/1280,640/1280,1280/1280 --temporal-layering-mode=3 

for 3 spatial layers (1280x720, 640x360, 320x180), and 3 temporal layers.