How to use VA-API in gstreamer?

[CC]

Hi,

I find the software h264 encode and decode will cause high cpu usage, so I
want to use  VA-API.
<https://gstreamer.freedesktop.org/modules/gstreamer-vaapi.html>  .

This is my origin command using avdec_h264 and x264enc.

gst-launch-1.0 -v udpsrc port=12347 !
application/x-rtp,payload=107,encoding-name=H264 ! rtph264depay !
video/x-h264, framerate=30/1 ! h264parse ! avdec_h264 ! videoconvert !
videoscale ! video/x-raw, width=640, height=480 ! queue ! videoconvert !
queue ! x264enc bitrate=1000 key-int-max=60 bframes=0 byte-stream=false
aud=true tune=zerolatency ! h264parse ! video/x-h264,profile=main ! queue !
mux. udpsrc port=12345 !
application/x-rtp,payload=111,encoding-name=OPUS,clock-rate=48000,
channels=2 ! rtpopusdepay ! opusparse ! opusdec ! queue ! voaacenc
bitrate=128000 ! aacparse ! audio/mpeg,mpegversion=4,stream-format=raw !
queue ! flvmux streamable=true name=mux ! queue ! rtmpsink
location=rtmp://192.168.1.165:1935/myapp/testav

I try to replace  avdec_h264 and x264enc with  vaapih264dec and
vaapih264enc. But it seems not working.

Thanks.






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