How to teach to stream VLC audio in parallel with video with input-slave=alsa?

Question

VLC

I'm trying to learn how to stream video and audio from a webcam using VLC on Ubuntu Server. For some reason, only the audio or only the video stream is streamed. I run this command and only audio is played at the output.

cvlc v4l2:// :v4l2-dev=/dev/video0 :v4l2-standard=1 :input-slave=alsa:// ':sout=#transcode{vcodec=theo,vb=3500,width=1920,height=1080,acodec=vorbis,ab=192,channels=2,samplerate=44100}:http{mux=ogg,dst=:8080/webcam.ogg}'

In case I start without input-slave=alsa:// in this way:

cvlc v4l2:// :v4l2-dev=/dev/video0 :v4l2-standard=1 :input-slave=alsa:// ':sout=#transcode{vcodec=theo,vb=3500,width=1920,height=1080,acodec=vorbis,ab=192,channels=2,samplerate=44100}:http{mux=ogg,dst=:8080/webcam.ogg}'

All that's left is the video.
In the event that the main and slave threads are swapped

cvlc alsa://hw:1,0 :input-slave=v4l2:///dev/video0 :sout="#transcode{vcodec=theo,vb=2000,acodec=vorb,ab=128,channels=2,samplerate=44100}:http{dst=:8080/webcam.ogg}

Also gives only audio.
VLC version:

$ vlc --version
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80)
Версия VLC 2.2.7 Umbrella (2.2.2+git20170721+r59033+56~ubuntu16.04.1)

VLC log -vvv
How to merge audio and video?