diff --git a/scripts/prepareVideo.sh b/scripts/prepareVideo.sh
index 4554be7..29b72c8 100755
--- a/scripts/prepareVideo.sh
+++ b/scripts/prepareVideo.sh
@@ -4,7 +4,7 @@ cp app.mp4 original.mp4
 ffprobe -f lavfi -i "movie=app.mp4,blackdetect[out0]" -show_entries tags=lavfi.black_start,lavfi.black_end -of default=nw=1 -v quiet > ffmpeg_info
 END_OF_BLACK=`cat ffmpeg_info | grep end | head -n1 | cut -d'=' -f2`
 
-END_OF_BLACK=$[ $END_OF_BLACK + 2.2 ]
+END_OF_BLACK=`awk "BEGIN {print $END_OF_BLACK+0.8; exit}"`
 # Trim black frames at start
 ffmpeg -ss $END_OF_BLACK -i app.mp4 app2.mp4
 mv app2.mp4 app.mp4
diff --git a/scripts/uiTests.sh b/scripts/uiTests.sh
index e68c710..f89251d 100755
--- a/scripts/uiTests.sh
+++ b/scripts/uiTests.sh
@@ -17,7 +17,7 @@ export PID_XVFB=$!
 sleep 2
 
 # Debug with VNC
-while [ "$TEST_EXIT_CODE" = "" ]; do x11vnc -passwd "bierbier" -display :$SCR; done &
+while [ "$TEST_EXIT_CODE" = "" ]; do x11vnc -localhost -passwd "bierbier" -display :$SCR; done &
 export PID_VNC=$!
 
 # Start mqtt broker