No video output on Pi3 Ground station

[Griiis]

Good day to everyone! I have an issue with opening videostream on Pi 3B.
My setup is next, for gs:

Raspbbery Pi 3B
RTL8812AU USB stick
HDMI display

On other, camera side, i have:
OpenIPC Fimware
RTL8812AU USB stick
SSC338Q camera

I can confirm, that video streem from camera up and running, becose i tested it via link on my PC and futher more - tested on android GS and it works. With big delays, but works.

I am followed standart instalation procidure, with drivers and all this stuff, based on commands from this video:
https://www.youtube.com/watch?v=JMtRAsOm0Dc&t=421s

I am aware about Pi3 Image, that provided by wfb-ng repo, but i need for several reasons build it from scratch.
I am also see, that packets going trough link, becose recv exist and fec_r works, has losts and no d_err.

I try to watch stream via VLC player command, but VLC states, that this is not h264 stream.

Could anyone please help me out on that or point me out on a solutions?
I know, that wfb-ng itself is just a tunnel for data, that's why i do not understand, why after receiving and decoding there is no video info. Besides that, android GS works well, but no PI station.

Apreciate any help.

[Griiis]

Nevermind. I am still decompose the problem, but this one work for me:
gst-launch-1.0 udpsrc port=5600 caps='application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264' ! rtph264depay ! avdec_h264 ! clockoverlay valignment=bottom ! autovideosink sync=false
Just in case anyone will need to test out