Repeatedly take photos from webcam using ffmpeg and upload them to PrusaConnect

camera.sh

#!/bin/bash
# based on this script by nunofgs
# https://gist.github.com/nunofgs/84861ee453254823be6b069ebbce9ad2

# fingerprint needs to be unique per camera
# it's just a random string, generate one with `uuidgen` or `pwgen 32 1`
# if you lose it, delete and re-add the camera in PrusaConnect then rotate $FINGERPRINT and $TOKEN here
FINGERPRINT=fingerprint-goes-here

# PrusaConnect "other camera" token
TOKEN=token-goes-here


DELAY_SEC=10
FAIL_DELAY_SEC=60
ENDPOINT=https://webcam.connect.prusa3d.com/c/snapshot


while true; do
  # Take a screenshot from first attached webcam
  if ffmpeg \
    -y \
    -f v4l2 \
    -video_size 1280x720 \
    -i /dev/video0 \
    -r 0.2 \
    -qscale:v 2 \
    -update 1 \
    /tmp/output.jpg
  then
    curl \
      -X PUT "$ENDPOINT" \
      -H "accept: */*" \
      -H "content-type: image/jpg" \
      -H "fingerprint: $FINGERPRINT" \
      -H "token: $TOKEN" \
      --data-binary "@/tmp/output.jpg" \
      --compressed \
      --silent
    sleep "$DELAY_SEC"
  else
    echo "Unable to take photo from webcam. Sleeping ${FAIL_DELAY_SEC}s..."
    sleep "${FAIL_DELAY_SEC}"
  fi
done