[Libva] intra refresh mode for h264 video (intel driver)

[Xiang, Haihao]

libva has the interface for intra refresh on the staging branch, but so
far the intel driver (i965) doesn't support this feature.

Thanks
Haihao


> Is anyone aware if this is possible to do through libva with the intel
> driver?  The technique I'm referring to involves embedding a
> horizontal slice of the full image within each P frame.  This ensures
> there won't be large IDR frames coming up every X frames in a live
> stream.
> 
> 
> In libva, I've tried breaking the picture into slices, and also
> adjusting the IDR settings.  Most of the time it just doesn't work at
> all.  The closest I can get to the desired behavior is to go entirely
> to regular P frames, which is actually pretty good aside from
> glitchiness on startup (and some decoders not handling it at all).
> 
> 
> Is intra refresh possible in libva?  Are there any other techniques
> that libva can use that would help avoid IDR frame spikes?
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