Thingino Camera Grid

#!/bin/bash
######################################################################
#Copyright (C) 2025 Kris Occhipinti
#https://filmsbykris.com
#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation version 3 of the License.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.

#You should have received a copy of the GNU General Public License
#along with this program.  If not, see <http://www.gnu.org/licenses/>.
######################################################################

# Stream a grid of videos from cameras

#channel 1 is a lower resolution on thingino over channel 0
# this is better for streaming multiple cameras
cam_01="rtsp://thingino:thingino@camera-01:554/ch1"
cam_02="rtsp://thingino:thingino@camera-02:554/ch1"
cam_03="rtsp://thingino:thingino@camera-03:554/ch1"

# I only have 3 cameras so create black video to fill last spot
# Create a black video source
black="color=c=black:s=640x360" # adjust resolution to match other videos

top_row="[0:v][1:v]hstack=inputs=2[top];"
bottom_row="[2:v][3:v]hstack=inputs=2[bottom];"

stack="[top][bottom]vstack=inputs=2[v]"

ffmpeg -i "$cam_01" -i "$cam_02" -i "$cam_03" -f lavfi -i "$black" \
  -filter_complex "${top_row}${bottom_row}${stack}" \
  -map "[v]" -c:v libx264 -f nut - | ffplay -i -