[Bug 783023] [KBL/APL/SLK][media/libva][AVC Encode CBR Multi-Slice] the output bitrate compare to the input target bitrate bigger than 10% by using gstreamer as tool.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783023

--- Comment #1 from sreerenj <bsreerenj at gmail.com> ---
IIUC, your test scripts using calculations based on the assumption that
framerate is 30 which is not the cause unless you set it in videoparse.

Use the below pipeline:
gst-launch-1.0 -v filesrc location=stockholm_1280x720_604.yuv '!' videoparse
format=i420 width=1280 height=720 framerate=30/1 '!' vaapih264enc
rate-control=cbr bitrate=1000 keyframe-period=30 num-slices=1 max-bframes=2 '!'
filesink location=./stockholm_1280x720_604.yuv-1000-2-cbr-gop30-slice2.h264

Or use framerate 25 in your calculation.

I have tested the same file and no issue.

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