Aufnahmedateien überlappen

Dump.sh

@@ -6,7 +6,9 @@ PORT=8080
 USERNAME=admin
 PASSWORD="123456"
 CAMERAS="0 1 2 3 4 5 6 7 8"
+# the real values _will_ differ depending on the machine running the script !!!
 SECONDS_PER_FILE=60
+OVERLAP_PER_FILE=2
 
 PIDFILE_BASE=/tmp/wget_script.$RANDOM.pids
 if [ -z "$NAME" ]; then
@@ -37,7 +39,7 @@ do_record() {
 		( 
 			EXACT_START_TIME=$(date +%s.%N)
 			outfile_close_trap() {
-				echo trap
+				echo "finishing capture file for camera $i"
 				EXACT_END_TIME=$(date +%s.%N)
 				if [ -f $OUTFILE_START ]; then
 					mv $OUTFILE_START dump_cam_${i}_${EXACT_START_TIME}_${EXACT_END_TIME}.mjpg
@@ -59,15 +61,27 @@ while true; do
 	echo "starting group A"
 	do_record A &
 	PIDS_B="$(cat ${PIDFILE_BASE}_B 2>/dev/null)"
-	if [ ! -z "$PIDS_B" ]; then echo "killing group B"; kill $PIDS_B 2>/dev/null; fi
-	sleep $SECONDS_PER_FILE
+	if [ ! -z "$PIDS_B" ]; then
+		$OVERLAP_PER_FILE
+		echo "killing group B"
+		kill $PIDS_B 2>/dev/null
+		sleep $(($SECONDS_PER_FILE - $OVERLAP_PER_FILE))
+	else
+		sleep $SECONDS_PER_FILE
+	fi
 
 	if [ ! -z "$PIDS_B" ]; then kill -9 $PIDS_B 2>/dev/null; fi
 	echo "starting group B"
 	do_record B &
 	PIDS_A="$(cat ${PIDFILE_BASE}_A 2>/dev/null)"
-	if [ ! -z "$PIDS_A" ]; then echo "killing group A"; kill $PIDS_A 2>/dev/null; fi
-	sleep $SECONDS_PER_FILE
+	if [ ! -z "$PIDS_A" ]; then
+		sleep $OVERLAP_PER_FILE
+		echo "killing group A"
+		kill $PIDS_A 2>/dev/null
+		sleep $(($SECONDS_PER_FILE - $OVERLAP_PER_FILE))
+	else
+		sleep $SECONDS_PER_FILE
+	fi
 done
 
 quit 1