disable cam preview by default

camera1/cam-to-udp.sh

@@ -23,7 +23,7 @@ h=600
 roi="roi-x=0.00 roi-y=0 roi-w=1.00 roi-h=1.00"
 
 novideo="-n"
-PREVIEW=""
+PREVIEW="preview=0"
 
 while [ $# -gt 0 ]; do
 	if [ "$1" == "proj" ]; then