Slow live streaming

[Masso]

Good morning,
I'm trying to transmit a video acquired by a frame grabber.
My grabber provides a raw h264 stream, and to stream, I'm using the following command:

getVideo | cvlc file/h264:///dev/stdin - --sout '#rtp{dst=224.0.0.7,port=5004,sdp=rtsp://192.168.2.135:1234/test.sdp}' --sout-mux-caching=1 --sout-udp-caching=1 --sout-rtp-caching=1 --network-caching=1 --sout-keep

(getVideo is a program that sends the video to stdout in raw h264)
Everything works, but I have a delay of about 0.8 seconds, I can do something to reduce this delay?
Thanks in advance, FM