diff --git a/resize-temps.sh b/resize-temps.sh
new file mode 100755
index 0000000..426f99d
--- /dev/null
+++ b/resize-temps.sh
@@ -0,0 +1,161 @@
+#!/bin/bash
+# resize-temps.sh — re-size *-temp.mp4 files from a backup location into
+# correctly-proportioned *-final.mp4 files for use with montage-mvt.sh.
+#
+# Reads source temp files from BACKUP_ROOT (never modifies them).
+# Writes finals to MOVIES_DIR (from sky-cam.conf / .env).
+#
+# Usage:
+#   ./resize-temps.sh --cam <camera-name> <backup_root> [--dry-run]
+#
+# Example:
+#   ./resize-temps.sh --cam east /home/user/drives/data2/other-pictures/longterm/movies/movies
+#   ./resize-temps.sh --cam north /mnt/backup/movies --dry-run
+#
+# The backup_root should contain the old season directories:
+#   <backup_root>/<cam>/Spring/  Winter/  Summer/  Autumn/
+# with files like:  2025-06-15_Mvt2-temp.mp4
+#
+# Output goes to:
+#   MOVIES_DIR/<cam>/<ASTRO_YEAR>/<SEASON>/Mvt<N>/<date>_Mvt<N>-Day<D>of<T>-final.mp4
+#
+# Already-existing finals are skipped (never overwritten).
+
+set -euo pipefail
+
+SCRIPT_DIR="$(dirname "$(realpath "$0")")"
+source "$SCRIPT_DIR/sky-cam.conf"
+export TIMEZONE
+
+# ── Args ──────────────────────────────────────────────────────────────────────
+CAM=""
+BACKUP_ROOT=""
+DRY_RUN=false
+
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        --cam)      CAM="$2";        shift 2 ;;
+        --dry-run)  DRY_RUN=true;    shift   ;;
+        -*)         echo "Unknown option: $1"; exit 1 ;;
+        *)          BACKUP_ROOT="$1"; shift  ;;
+    esac
+done
+
+if [ -z "$CAM" ] || [ -z "$BACKUP_ROOT" ]; then
+    echo "Usage: $0 --cam <camera-name> <backup_root> [--dry-run]"
+    echo "  e.g. $0 --cam east /home/user/drives/data2/other-pictures/longterm/movies/movies"
+    exit 1
+fi
+
+if [ ! -d "$BACKUP_ROOT/$CAM" ]; then
+    echo "ERROR: $BACKUP_ROOT/$CAM not found"
+    exit 1
+fi
+
+music_base_dir="$MUSIC_DIR"
+[ ! -d "$music_base_dir" ] && music_base_dir="$SCRIPT_DIR/music"
+
+echo "Camera:      $CAM"
+echo "Backup root: $BACKUP_ROOT/$CAM"
+echo "Output root: $MOVIES_DIR/$CAM"
+echo "Music dir:   $music_base_dir"
+$DRY_RUN && echo "DRY RUN — no files will be written"
+echo ""
+
+# ── Find all temp files ───────────────────────────────────────────────────────
+mapfile -d '' temp_files < <(
+    find "$BACKUP_ROOT/$CAM" -type f -name '*-temp.mp4' -print0 | sort -z
+)
+
+if [ "${#temp_files[@]}" -eq 0 ]; then
+    echo "No *-temp.mp4 files found under $BACKUP_ROOT/$CAM"
+    exit 0
+fi
+echo "Found ${#temp_files[@]} temp file(s)"
+echo ""
+
+skipped=0
+processed=0
+errors=0
+
+for temp_file in "${temp_files[@]}"; do
+    # Extract date from filename: 2025-06-15_Mvt2-temp.mp4 → 2025-06-15
+    filename="$(basename "$temp_file")"
+    date_str="${filename%%_*}"
+
+    # Validate date format
+    if ! [[ "$date_str" =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]]; then
+        echo "SKIP (bad filename): $temp_file"
+        (( skipped++ )) || true
+        continue
+    fi
+
+    # Get season/movement info for this date
+    _info="$(python3 "$SCRIPT_DIR/season_info.py" "$date_str" 2>/dev/null)" || {
+        echo "SKIP (season_info.py failed for $date_str): $filename"
+        (( skipped++ )) || true
+        continue
+    }
+    eval "$_info"
+    # Provides: SEASON  MVT_NUM  DAY_OF_MVT  DAYS_IN_MVT  MVT_START  MVT_END
+    #           IS_LAST_DAY  ASTRO_YEAR
+
+    # Locate music file
+    music_file=$(find "$music_base_dir" -type f -iname "*${SEASON}*" \
+        | grep -iE "Mvt[^0-9]*${MVT_NUM}[^0-9]" | sort | head -n 1)
+    if [ -z "$music_file" ]; then
+        echo "SKIP (no music for $SEASON Mvt$MVT_NUM): $filename"
+        (( skipped++ )) || true
+        continue
+    fi
+    music_duration=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$music_file")
+    target_per_clip=$(echo "scale=6; $music_duration / $DAYS_IN_MVT" | bc)
+
+    # Determine output path
+    out_dir="$MOVIES_DIR/$CAM/$ASTRO_YEAR/$SEASON/Mvt$MVT_NUM"
+    final_file="$out_dir/${date_str}_Mvt${MVT_NUM}-Day${DAY_OF_MVT}of${DAYS_IN_MVT}-final.mp4"
+
+    # Skip if final already exists
+    if [ -f "$final_file" ]; then
+        echo "EXISTS — skip: $(basename "$final_file")"
+        (( skipped++ )) || true
+        continue
+    fi
+
+    raw_dur=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$temp_file")
+    speed_factor=$(echo "scale=6; $raw_dur / $target_per_clip" | bc)
+
+    echo "Processing: $filename"
+    echo "  $SEASON Mvt$MVT_NUM  Day$DAY_OF_MVT/$DAYS_IN_MVT  Year=$ASTRO_YEAR"
+    echo "  raw=${raw_dur}s  target=${target_per_clip}s  speed=${speed_factor}x"
+    echo "  → $(basename "$final_file")"
+
+    if $DRY_RUN; then
+        (( processed++ )) || true
+        continue
+    fi
+
+    mkdir -p "$out_dir"
+
+    if ffmpeg -loglevel warning \
+        -i "$temp_file" \
+        -vf "setpts=PTS/$speed_factor" \
+        -c:v libx264 -pix_fmt yuv420p -preset "$ENCODE_PRESET" -crf "$CRF_SEASONS_FINAL" \
+        -t "$target_per_clip" -an \
+        -y "$final_file"; then
+        actual=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$final_file")
+        echo "  Done: ${actual}s"
+        (( processed++ )) || true
+    else
+        rm -f "$final_file"
+        echo "  ERROR: ffmpeg failed — no output written"
+        (( errors++ )) || true
+    fi
+    echo ""
+done
+
+echo "────────────────────────────────────────"
+echo "Processed: $processed   Skipped: $skipped   Errors: $errors"
+if $DRY_RUN; then
+    echo "(dry run — re-run without --dry-run to write files)"
+fi