> >
> > > +        if (avctx->codec_id == AV_CODEC_ID_VP8)
> > > +            vp8_encode_set_roi(avctx, frame);
> >
> > The API only exists for VP8, or is this due to different quant scales or
> > something?
> currently, VP9 ROI does not work, see my discussion at 
> https://groups.google.com/a/webmproject.org/forum/#!topic/codec-devel/HVBRjoW0fTw,
> the issue is confirmed by libvpx, and I'm helping to verify their new patch 
> for the fix.

It might be worth letting that conversation finish before pushing
anything here. The API for VP9 hasn't changed, but there was a bug as
you pointed out in that thread.

> It is expected that VP9 ROI support will not be released in a short time, so 
> I just add for vp8 roi.
> There is something common between VP8/VP9 ROI, and I plan to extract an 
> common function when doing the work for VP9 roi.
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