[Libva] VBR support in vaapiencode_h264

[Whitchurch, Arun]

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?
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?
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/libva/attachments/20150818/711f6623/attachment.html>