Needed help with avenc_mpeg2video

[walkingdude]

Hi,
I am trying to stream desktop from from one machine to another over LAN,
using udp. I want to utilize mpeg2. 
My goals are:
-highest possible quality
-lowest possible latency (definitely < 0.5s)

I am trying to use qscale parameter but I can't get the syntax right. Any
help greatly appreciated. Now it gives me gray screen with some static,
distortions and small squares which are properly encoded. In vlc though it
looks ok. 
What I've got so far:

Transmitter:
gst-launch-1.0 -v ximagesrc use-damage=false startx=0 endx=1439 starty=0
endy=899  ! videoconvert ! videoscale !
video/x-raw,format=I420,width=1440,height=900 ! avenc_mpeg2video  !
rtpmpvpay  ! udpsink host=192.168.2.100 port=9000

Receiver:
gst-launch-1.0 -v udpsrc port=9000 caps = "application/x-rtp,
media=(string)video, clock-rate=(int)90000, encoding-name=(string)MPV,
payload=(int)32, ssrc=(uint)1433547687, timestamp-offset=(uint)3139621248,
seqnum-offset=(uint)31532, a-framerate=(string)25" ! rtpmpvdepay !
avdec_mpeg2video ! autovideosink



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