Fix season dates, resolution, attribution, retention policies, montage trigger

season_info.py (new):
- Computes actual equinox/solstice dates via Jean Meeus approximation
- Converts to LOCAL timezone (pytz / zoneinfo) so the calendar date reflects
  what the camera sees on the ground, including DST transitions
- Timezone defaults to America/New_York; override via $TIMEZONE env or 2nd arg
- Divides each season into 3 equal movements; handles Winter's year boundary
- Outputs IS_LAST_DAY=true on the final day of each movement

4-seasons.sh:
- Uses season_info.py for all date/season logic (no hardcoded day-of-year)
- Passes $yesterday to season_info.py so astronomical dates are correct
- Removed forced 1280x720 scale; clips stay at native camera resolution
- Auto-triggers montage-mvt.sh "$yesterday" on last day of movement so the
  correct movement (not the next day's) is compiled

montage-mvt.sh:
- Accepts optional YYYY-MM-DD argument (passed by 4-seasons.sh) so it
  resolves the correct season/movement when run the morning after last day
- Detects source resolution from first daily clip via ffprobe; attribution
  card is generated at that exact resolution — no resizing of main video
- Font sizes proportional to frame height so text looks right at any res
- License corrected to CC BY-SA 3.0 (was CC BY-NC-SA 4.0)

fullday-video.sh:
- Removed 30-minute target; video length is natural (num_images / FPS)
- Default FULLDAY_FPS=5 (configurable at top of script)
- Retains RETENTION_DAYS=10 auto-delete for full-day videos only
- Sunrise 10s uploads and montage videos are never auto-deleted

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ

fullday-video.sh

@@ -1,24 +1,22 @@
 #!/bin/bash
-# fullday-video.sh — create an ~30-minute timelapse of yesterday's full day of
-# images.  Files older than 10 days are deleted automatically to save space.
-# Run once per day (e.g. from cron at 02:00, after 4-seasons.sh).
+# fullday-video.sh — create a natural-speed timelapse of yesterday's full day of
+# images at a fixed frame rate.  Files older than RETENTION_DAYS are deleted
+# automatically.  Sunrise 10-second uploads and montage videos are NOT touched.
+#
+# Run once per day from cron (e.g. 02:00 daily, after 4-seasons.sh).
 
 set -euo pipefail
 
+SCRIPT_DIR="$(dirname "$(realpath "$0")")"
+
 # ── Configuration ──────────────────────────────────────────────────────────────
 base_dir="/home/motion/drives/local-2tb"
-script_name=$(basename "$(dirname "$(realpath "$0")")" | cut -d'-' -f1)
-
-TARGET_DURATION=1800   # target video length in seconds (~30 min)
-MIN_FRAME_DUR=0.016667 # max 60 fps
-MAX_FRAME_DUR=10.0     # min 0.1 fps (10 s per frame)
-RETENTION_DAYS=10
-
-TARGET_W=1280
-TARGET_H=720
+FULLDAY_FPS=5       # timelapse frame rate — adjust to taste
+RETENTION_DAYS=10   # full-day videos older than this are deleted
 
 # ── Date / paths ──────────────────────────────────────────────────────────────
 yesterday=$(date --date="yesterday" +%Y-%m-%d)
+script_name=$(basename "$SCRIPT_DIR" | cut -d'-' -f1)
 image_dir="$base_dir/$script_name/$yesterday"
 output_dir="$base_dir/movies/$script_name/fullday"
 mkdir -p "$output_dir"
@@ -35,48 +33,36 @@ fi
 
 num_images=$(find "$image_dir" -type f -name "*.jpg" | wc -l)
 if [ "$num_images" -lt 1 ]; then
-    echo "WARNING: No images found in $image_dir — skipping."
+    echo "WARNING: No images in $image_dir — skipping."
     exit 0
 fi
-echo "Images: $num_images"
 
-# ── Calculate per-frame duration to hit TARGET_DURATION ───────────────────────
-frame_dur=$(echo "scale=6; $TARGET_DURATION / $num_images" | bc)
-
-# Clamp to [MIN_FRAME_DUR, MAX_FRAME_DUR]
-if (( $(echo "$frame_dur < $MIN_FRAME_DUR" | bc -l) )); then frame_dur=$MIN_FRAME_DUR; fi
-if (( $(echo "$frame_dur > $MAX_FRAME_DUR" | bc -l) )); then frame_dur=$MAX_FRAME_DUR; fi
-
-fps=$(echo "scale=4; 1 / $frame_dur" | bc)
-approx_min=$(echo "scale=1; $num_images * $frame_dur / 60" | bc)
-echo "Frame duration: ${frame_dur}s  (fps=${fps})  ≈ ${approx_min} min"
+frame_dur=$(echo "scale=6; 1 / $FULLDAY_FPS" | bc)
+approx_min=$(echo "scale=1; $num_images / $FULLDAY_FPS / 60" | bc)
+echo "Images: $num_images at ${FULLDAY_FPS} fps  ≈ ${approx_min} min"
 
 # ── Build concat list with per-frame duration ─────────────────────────────────
-# The concat demuxer requires the last file to be repeated without a duration.
+# The concat demuxer needs an explicit duration per image; the last file is
+# repeated without a duration to correctly anchor the final frame's pts.
 temp_list=$(mktemp --suffix=.txt)
 trap 'rm -f "$temp_list"' EXIT
 
-last_img=""
 find "$image_dir" -type f -name "*.jpg" | sort | while read -r img; do
-    echo "file '$img'"
-    echo "duration $frame_dur"
-    last_img="$img"
+    printf "file '%s'\nduration %s\n" "$img" "$frame_dur"
 done > "$temp_list"
 
-# Append last image again (required by concat demuxer to set final frame pts)
+# Append last image again (required by ffmpeg concat demuxer for images)
 last_img=$(find "$image_dir" -type f -name "*.jpg" | sort | tail -n 1)
-echo "file '$last_img'" >> "$temp_list"
+printf "file '%s'\n" "$last_img" >> "$temp_list"
 
-# ── Encode ────────────────────────────────────────────────────────────────────
+# ── Encode — native camera resolution, no audio ───────────────────────────────
 output_file="$output_dir/${yesterday}-fullday.mp4"
-echo "Creating full-day video: $output_file"
+echo "Creating: $output_file"
 
 ffmpeg -loglevel warning \
     -f concat -safe 0 -i "$temp_list" \
-    -vf "scale=${TARGET_W}:${TARGET_H}:force_original_aspect_ratio=decrease,\
-pad=${TARGET_W}:${TARGET_H}:(ow-iw)/2:(oh-ih)/2,setsar=1" \
     -c:v libx264 -pix_fmt yuv420p -crf 28 \
     -an -y "$output_file"
 
 actual_dur=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$output_file")
-echo "Done: $output_file  (${actual_dur}s)"
+echo "Done: $output_file  (${actual_dur}s / $(echo "scale=1; $actual_dur/60" | bc) min)"