diff --git a/tools/mkloop.sh b/tools/mkloop.sh
index 0d99dda..1190858 100755
--- a/tools/mkloop.sh
+++ b/tools/mkloop.sh
@@ -6,8 +6,14 @@ source tools/config.sh
 source tools/fonctions.sh
 
 SEQNAME="$1"
+START=0
 
-echo "Running $0 $SEQNAME" >> WS/log
+if [ $# == 2 ]
+then
+	START=$2
+fi
+
+echo "$0 $SEQNAME from $START" >> WS/log
 
 DIMS="-W$Img_Width -H$Img_Height"
 POVOPT="+q9 +A0.02 -d ${DIMS} -WT5"
@@ -15,7 +21,7 @@ echo $POVOPT ; echo ; sleep 2
 
 TMPIMG=/dev/shm/${SEQNAME}-tmp.png
 
-for frame in $(seq   0 $((NBFRAMES-1)))
+for frame in $(seq $START $((NBFRAMES-1)))
 do
 
 	img=$(printf "frames/%s/%05d.png" $SEQNAME $frame)