gstreamer-vaapi performance decrease of 25% with USE_NATIVE_FORMATS 1

[Thomas Scheuermann]

Hello,

we have a performance decrease of 25% with the define in
gstvaapivideomemory.c
#define USE_NATIVE_FORMATS 1

We run 6 pipelines in parallel:
gst-launch-1.0 videotestsrc -e num-buffers=3000 !
video/x-raw,width=1920,height=1080,framerate=30/1 ! videoconvert !
vaapiencode_h264 ! queue ! mp4mux ! filesink location=test.mp4

If gstreamer-vaapi is compiled with
#define USE_NATIVE_FORMATS 0
the pipelines run about 25% faster.

What could be the reason for this?

Regards,

Thomas
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