setting vp9enc for real time encoding

[Yisus]

Hi,

 We are using vp9enc for one of our pipelines in order to transcode a rtp
video stream, from H264 to VP9. The issue is that vp9enc introduce too
latency for real time communication.

///////////////////////////////////////////////////////////////////////

 Sender:

  gst-launch-1.0 v4l2src ! video/x-raw, width=640, height=480 ! videoconvert
! openh264enc ! rtph264pay ! udpsink host=127.0.0.1 port=9001

 Transcoding:

 gst-launch-1.0 udpsrc port=9001 caps="application/x-rtp,
media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264,
payload=(int)96" ! rtph264depay ! avdec_h264 ! vp9enc cpu-used=5 ! rtpvp9pay
! udpsink host=127.0.0.1 port=9002

 Receiver:

  gst-launch-1.0 udpsrc port=9002 caps="application/x-rtp,
media=(string)video, clock-rate=(int)90000, encoding-name=(string)VP9,
payload=(int)96" ! rtpvp9depay ! vp9dec ! autovideosink   
  
////////////////////////////////////////////////////////////////////////

We have tried different settings of the vp9enc properties for encoding in
real time, (cpu-used=5  was usefull), but the latency is still too high 
(2-3 seconds). Some suggestion about how we can set element properties of
vp9enc for real time encoding?.  
 
Additionally,  I have to say that if we use vp8enc instead of vp9enc, the
latency is lower (0.5-1 second). Although the properties are the same for
both encoder, the properties values used for vp8enc (deadline=1) are not
valid for vp9enc.

 Thanks in advance. 







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