nvidia jetson nano + elgato camlink 4k + a DSLR camera

With this you can record 4k H.264 video fom a DSLR camera, connected with the elgato camlink 4k. This is the bridge between gst-launch-1 and the record button. These button is a switch button, connected to a ESP32 D1 Mini NodeMCU. On the jetson side runs a wifi wifi accesspoint (hostapd) and a dns server (dnsmasq). The mini NodeMCU connect to the wifi accesspoint. On the jetson side runs also a webserver. This webserver receives the record trigger - and records. The recording will be done by gst-launch-1.0, launched by the node.js app.

configure

The folder config/ contains some configuration files. edit by your will. I hope that you know what you do. if not: educate your mind.

setup

update

sudo apt-get update -y
sudo apt-get upgrade -y

disable desktop

sudo systemctl stop gdm3
sudo systemctl disable gdm3
sudo systemctl set-default multi-user.target
sudo reboot

install stuff

sudo apt-get install htop nano curl git autofs exfat-fuse hostapd dnsmasq -y

node.js

sudo su
curl -L https://git.io/n-install | bash

autofs

Plug a sd card reader on the jetson and use it as video storage.

check device

sudo lsblk -o UUID,NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL,MODEL

autofs config

sudo nano /etc/auto.automnt

content, replace CHANGE!ME with the uuid from the device check
```
camsd -fstype=exfat :/dev/disk/by-uuid/CHANGE!ME
```
create dir (not as root)

mkdir /automnt
chown $USER:$USER

auto.master

sudo nano /etc/auto.master

content

/automnt /etc/auto.automnt uid=1000,gid=1000,--timeout=5,--ghost

restart

sudo service autofs restart

run (development)

sudo su
cd /somewhere/on/my/disk/gst-camlink-jetson
npm install
npm start

run it with system start

sudo su
npm install pm2 -g
pm2 startup

cd /somewhere/on/my/disk/gst-camlink-jetson
pm2 start "npm start" --name "camlink"
pm2 save

check

pm2 logs

nodeMCU

Burn the programm from nodemcu/http on a mini nodeMCU.

wiring:

D1 -> 10K resistor -> GROUND
D1 -> button left
3V -> button right

GROUND -> power minus
5V -> power plus

Hardware

the box

IKEA screw box case
nvidia jetson nano
Elgato camlink 4k usb 3 stöpsel
SD Card reader (writer) usb
Wifi usb stöpsel
A bike battery (37V / 12Ah)
1 x dc down converter from bike battery to 12V
1 x dc down converter from 12V to 5V
Cigarette lighter socket
2 x power on switch
Some luster terminals
Wires, end sleeves, cable ties, M3 screws and mothers, spacers
Short but thick USB extension cable (camlink)

camera

DSLR camera with "clean video" output. means: pure (mini) hdmi output without display elements on it.
External power battery for the cam to usb
mini hdmi to hdmi cable short (into the splitter)
hdmi splitter with usb power
hdmi wire (into the box)
1 x dc down converter from 12V to 5V
2 x 12V LED lights
mini D1 nodeMCU
usb mother plates (to powering the cam and the splitter)
camera cage (solid steel)
2 x switches (Lights, Record)
3 x cable entries
A (or two) small black plastic boxes
Cable ties, luster terminals, M3s

seekwhencer / gst-camlink-jetson