[Bug 789472] New: vaapih264enc bitrate target not respected in low-power mode

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789472

            Bug ID: 789472
           Summary: vaapih264enc bitrate target not respected in low-power
                    mode
    Classification: Platform
           Product: GStreamer
           Version: 1.12.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: florent.thiery at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Trying to generate a 8 Mbits/s file, but the resulting one is 20 Mbits/s.

gst-launch-1.0 videotestsrc num-buffers=1000 ! "video/x-raw,
format=(string)NV12, width=(int)1920, height=(int)1080,
framerate=(fraction)30/1, multiview-mode=(string)mono,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive" !
vaapih264enc bitrate=8000 keyframe-period=30 tune=low-power ! mp4mux ! filesink
location=test.mp4

Also, specifying CBR fails:

gst-launch-1.0 videotestsrc num-buffers=1000 ! "video/x-raw,
format=(string)NV12, width=(int)1920, height=(int)1080,
framerate=(fraction)30/1, multiview-mode=(string)mono,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive" !
vaapih264enc bitrate=8000 keyframe-period=30 tune=low-power rate-control=cbr !
mp4mux ! filesink location=test.mp4
0:00:00.064459811  2165 0x55eb91cce230 ERROR                  vaapi
gstvaapicontext.c:274:config_create: unsupported CBR rate control

So my guess is that it's doing cqp ? What can i do to control the target
bitrate in low power mode ?

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