diff --git a/4-seasons.sh b/4-seasons.sh
index 7429505..9c56898 100755
--- a/4-seasons.sh
+++ b/4-seasons.sh
@@ -135,8 +135,10 @@ if [ "${#images[@]}" -eq 0 ]; then
 fi
 
 for img in "${images[@]}"; do
-    printf "file '%s'\n" "$img"
+    printf "file '%s'\nduration 0.04\n" "$img"
 done > "$temp_file"
+# ffmpeg concat demuxer requires a final entry with no duration for image files
+printf "file '%s'\n" "${images[-1]}" >> "$temp_file"
 
 # ── Step 1: Build raw video ───────────────────────────────────────────────────
 echo "Step 1/2: encoding raw video from ${#images[@]} frames..."
@@ -155,7 +157,7 @@ echo "Step 2/2: speed factor $speed_factor..."
 final_file="$output_dir/${CAM_NAME}-${yesterday}_Mvt${MVT_NUM}-Day${DAY_OF_MVT}of${DAYS_IN_MVT}-final.mp4"
 if ! ffmpeg -loglevel warning \
     -i "$temp_video" \
-    -vf "setpts=PTS/$speed_factor" \
+    -vf "setpts=PTS/$speed_factor,fps=25" \
     -c:v libx264 -pix_fmt yuv420p -preset "$ENCODE_PRESET" -crf "$CRF_SEASONS_FINAL" \
     -t "$target_per_clip" -an \
     -y "$final_file"; then