[Libva] VBR support in vaapiencode_h264

[Zhao Yakui]

On 08/18/2015 08:01 AM, Whitchurch, Arun wrote:
> Hi,
>
> We are trying to use vaapiencode_h264 for encoding in VBR mode on an
> Intel J1900 processor. I’m getting an error that this is not supported.
> I traced it to i965_drv_video.c in libva-intel-driver. It sets the
> supported rate control modes to CQP and CBR. Is this a limitation of the
> hardware or is this something that hasn’t yet been implemented in software?

Current VBR is not implemented in software. And this will be added later.

>
> Also, in CQP mode, the QP can only be set once, at startup. Are there
> any plans in the future to make this a parameter that can be changed at
> run-time? Are there any limitations that would prevent this from being
> made into a parameter that can be changed at run-time?
>

In the example it is set once. But in your application you can set new 
QP and pass it to the driver based on your requirement.
This depends on your requirement.

Thanks.
    Yakui

> This is the output of va-info:
>
> # vainfo
>
> error: XDG_RUNTIME_DIR not set in the environment.
>
> libva info: VA-API version 0.37.0
>
> libva info: va_getDriverName() returns 0
>
> libva info: Trying to open /usr/lib/dri/i965_drv_video.so
>
> libva info: Found init function __vaDriverInit_0_37
>
> libva info: va_openDriver() returns 0
>
> vainfo: VA-API version: 0.37 (libva 1.5.1)
>
> vainfo: Driver version: Intel i965 driver for Intel(R) Bay Trail - 1.5.1
>
> vainfo: Supported profile and entrypoints
>
> VAProfileMPEG2Simple : VAEntrypointVLD
>
> VAProfileMPEG2Simple : VAEntrypointEncSlice
>
> VAProfileMPEG2Main : VAEntrypointVLD
>
> VAProfileMPEG2Main : VAEntrypointEncSlice
>
> VAProfileH264ConstrainedBaseline: VAEntrypointVLD
>
> VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
>
> VAProfileH264Main : VAEntrypointVLD
>
> VAProfileH264Main : VAEntrypointEncSlice
>
> VAProfileH264High : VAEntrypointVLD
>
> VAProfileH264High : VAEntrypointEncSlice
>
> VAProfileH264StereoHigh : VAEntrypointVLD
>
> VAProfileVC1Simple : VAEntrypointVLD
>
> VAProfileVC1Main : VAEntrypointVLD
>
> VAProfileVC1Advanced : VAEntrypointVLD
>
> VAProfileNone : VAEntrypointVideoProc
>
> VAProfileJPEGBaseline : VAEntrypointVLD
>
> Thanks,
>
> Arun
>
>
>
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