no element vp8enc

[mustafayuce66]

I have installed gstreamer and all plugins to orange pi jessie. But it gives
"no element vp8enc" error when i try to stream a video. My command is 

gst-launch-1.0 \
  audiotestsrc ! \
    audioresample ! audio/x-raw,channels=1,rate=16000 ! \
    opusenc bitrate=20000 ! \
      rtpopuspay ! udpsink host=127.0.0.1 port=5002 \
  videotestsrc ! \
    video/x-raw,width=320,height=240,framerate=15/1 ! \
    videoscale ! videorate ! videoconvert ! timeoverlay ! \
    vp8enc error-resilient=1 ! \
      rtpvp8pay ! udpsink host=127.0.0.1 port=5004


0:00:00.200073306  7442   0x94aec0 ERROR           GST_PIPELINE
grammar.y:804:priv_gst_parse_yyparse: no element "vp8enc"
0:00:00.200438667  7442   0x94aec0 ERROR           GST_PIPELINE
grammar.y:889:priv_gst_parse_yyparse: link has no sink [source=@0x94e098]
0:00:00.201261261  7442   0x94aec0 ERROR           GST_PIPELINE
grammar.y:889:priv_gst_parse_yyparse: link has no source [sink=@0x9520f8]

It gives this error. 

What might be the reason?

Kind Regards,




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