diff --git a/testdata/moonfire-nvr/.movement_detection_via_api_ffmpeg.sh.swp b/testdata/moonfire-nvr/.movement_detection_via_api_ffmpeg.sh.swp
deleted file mode 100644
index 5a24411..0000000
Binary files a/testdata/moonfire-nvr/.movement_detection_via_api_ffmpeg.sh.swp and /dev/null differ
diff --git a/testdata/moonfire-nvr/movement_detection_via_api_ffmpeg.sh b/testdata/moonfire-nvr/movement_detection_via_api_ffmpeg.sh
index 8546bac..a3c19ac 100644
--- a/testdata/moonfire-nvr/movement_detection_via_api_ffmpeg.sh
+++ b/testdata/moonfire-nvr/movement_detection_via_api_ffmpeg.sh
@@ -1,8 +1,8 @@
 #! /bin/bash
 
 main() {
-   local one_hour_ago_unix="$(($(date +%s) - 60 * 60))"
-   local one_hour_ago_ts="$(date -d @$one_hour_ago_unix -u +%Y-%m-%dT%H:%M:%SZ)"
+   local nonrecent_unix="$(($(date +%s) - 15 * 60))"
+   local nonrecent_ts="$(date -d @$nonrecent_unix -u +%Y-%m-%dT%H:%M:%SZ)"
 
    for uuid in $(
       api /api/ | jq -r .cameras[].uuid
@@ -15,15 +15,21 @@ main() {
          | jq -r .[0] \
          | sort -n #-r
       ); do
-         api "/api/cameras/$uuid/$stream/view.mp4?s=$recording&ts=true" > /tmp/f.mp4
-
-         local ts="$(ffprobe /tmp/f.mp4 2>&1 | grep creation_time | tail -n 1 | awk '{print $NF}' | sed 's/\.000000Z/Z/')"
-         if [[ "$ts" > "$one_hour_ago_ts" ]]; then
-            echo "$ts > $one_hour_ago_ts, skipping"
+         local ts="$(date -u -d @"$(
+            api "/api/cameras/$uuid/$stream/view.mp4.txt?s=$recording&ts=true" \
+            | grep -A 1 last_modified: \
+            | head -n 2 \
+            | tail -n 1 \
+            | awk '{print $NF}' \
+            | tr -d ','
+         )" +%Y-%m-%dT%H:%M:%SZ )"
+         if [[ "$ts" > "$nonrecent_ts" ]]; then
+            echo "$ts > $nonrecent_ts, so skipping"
             continue
          fi
 
          echo uuid=$uuid stream=$stream recording=$recording ts=$ts
+         api "/api/cameras/$uuid/$stream/view.mp4?s=$recording&ts=true" > /tmp/f.mp4
 
          local fps=$(ffprobe -i /tmp/f.mp4 2>&1 | grep -o '[0-9]*\.*[0-9]* fps' | head -n 1 | awk '{print $1}')
          local inspection="$(ffmpeg -i /tmp/f.mp4 -vf 'select=not(mod(n\,'${fps%.*}')),select=gte(scene\,0),metadata=print:file=-' -an -f null - 2> /dev/null | paste - -)"