diff --git a/testdata/moonfire-nvr/movement_detection_via_api_ffmpeg.sh b/testdata/moonfire-nvr/movement_detection_via_api_ffmpeg.sh
index c754949..fc555cf 100644
--- a/testdata/moonfire-nvr/movement_detection_via_api_ffmpeg.sh
+++ b/testdata/moonfire-nvr/movement_detection_via_api_ffmpeg.sh
@@ -5,6 +5,9 @@ set -eo pipefail
 if test -f /volume1/homes/squeaky2x3/services/moonfire-nvr.d/moonfire-nvr.sh; then
    bash /volume1/homes/squeaky2x3/services/moonfire-nvr.d/moonfire-nvr.sh
 fi
+if test -d /var/lib/moonfire-nvr; then
+   export MOONFIRE_DIR=/var/lib/moonfire-nvr
+fi
 
 main() {
    local nonrecent_unix="$(($(_date +%s) - 4 * 60 * 60))" # 4h ago
@@ -22,7 +25,7 @@ main() {
          | sort -n #-r
       ))
       for recording in "${recordings[@]}"; do
-         if grep "^$uuid.$recording$" /tmp/movement_detection_via_api_ffmpeg.sh.txt; then
+         if grep "^$uuid.$recording$" ${MOONFIRE_DIR:-/tmp}/movement_detection_via_api_ffmpeg.sh.txt; then
             continue
          fi
 
@@ -60,7 +63,7 @@ main() {
                threshold="$max_of_last_n"
             fi
          done
-         threshold="$(_perl -e "print $threshold + 0.005")"
+         threshold="$(_perl -e "print $threshold + 0.01")"
 
          local has_change=false
          if [ "${#flattened_scores[@]}" -lt 10 ]; then
@@ -73,7 +76,7 @@ main() {
          fi
 
          if $has_change; then
-            echo "$uuid.$recording" >> /tmp/movement_detection_via_api_ffmpeg.sh.txt
+            echo "$uuid.$recording" >> ${MOONFIRE_DIR:-/tmp}/movement_detection_via_api_ffmpeg.sh.txt
          else
             echo no movement in "$recording"
             api "/api/cameras/$uuid/$stream/view.mp4" \