MPV stream 2 videeo

#!/bin/bash
#stream 2 video/camera feeds at one
cam_01="rtsp://thingino:thingino@camera-01:554/ch0"
cam_02="http://192.168.1.150:8081"

scale="1280:720"
order="[cam1][cam2]"
stack="vstack[vo]" #stack videos vertically
#stack="hstack[vo]" #stack videos horizontally

complex="[vid1]scale=${scale}[cam1];[vid2]scale=${scale}[cam2];${order}${stack};"
mpv --lavfi-complex="$complex" "$cam_01" --external-file="$cam_02"