1. install raspian
2. boot
3. configure default sound card

lsusb
alsamixer

arecord -l

arecord -f cd -D plughw:0,0 | ffmpeg -i - -acodec libmp3lame -ab 128k -ac 1 -f rtp rtp://127.0.0.1:3000

sudo apt install git nginx vim 
sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

https://www.digitalocean.com/community/tutorials/how-to-set-up-a-video-streaming-server-using-nginx-rtmp-on-ubuntu-20-04

sudo apt install libnginx-mod-rtmp
sudo vim /etc/nginx/nginx.conf