Phase-correlation on the treeline/horizon band (rows 70-90%) found:
tx = -3324 px (north is 3324 px to the left of sunrise)
ty = -85 px (north camera is 85 px higher — slight tilt difference)
overlap = 516 px wide, feather-blended with a horizontal gradient
Result in images/stitch-preview/north-sunrise-aligned-preview.jpg:
7164x2075 px panorama with continuous horizon and treeline.
Cloud "V" at seam is a 36-second inter-shot artefact only; live video
frames captured simultaneously will have no such discontinuity.
stitch-cameras.py: accepts tx/ty overrides as argv[4]/argv[5] so the
offsets can be tuned without code changes.
https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ
- images/stitch-preview/north-sunrise-hstack.jpg:
naive side-by-side preview of the two skycams at 14:29 on 2026-04-17
- images/stitch-preview/feature-matches-debug.jpg:
close-up of overlap region (right 40% of north × left 40% of sunrise)
with ORB Lowe-ratio matches drawn — 39 candidates, RANSAC survives only
4 inliers because the 90° perspective offset invalidates a similarity
transform. Overlap IS present (trees, houses, power poles visible in
both) but full homography needs more/better tie points.
- stitch-cameras.py: reusable script that generates both previews plus a
similarity-transform .txt for reuse in ffmpeg filter chains once we
have enough matches (or manual tie-points).
https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ
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
4-seasons.sh:
- Fix per-video target duration: divide by days_in_movement (~30) not
days_in_season (~90), so concatenated clips sum to the movement's
music duration
- Force consistent 1280x720 output (scale+pad) to prevent resolution
mismatches when montage-mvt.sh concatenates across days
- Use ffprobe (not ffmpeg stderr parsing) for reliable duration reading
- Add music-dir fallback to repo-local music/ folder
- Remove the 2× music-doubling workaround (root cause fixed above)
montage-mvt.sh — complete rewrite:
- Proper season/movement detection matching 4-seasons.sh logic
- Step 1: concat all *-final.mp4 clips, normalise to 1280x720
- Step 2: speed-adjust concatenated video to exactly match music duration
- Step 3: merge with Vivaldi movement audio + 2 s video/audio fade in/out
- Step 4: generate 7-second black attribution card (drawtext) crediting
John Harrison / Wichita State University Chamber Players / FMA /
CC BY-NC-SA 4.0
- Step 5: concat montage + attribution into final file
- Temp files cleaned up via EXIT trap
fullday-video.sh — new script:
- Full-day timelapse from yesterday's images targeting ~30 minutes
- Per-frame duration = 1800 / num_images (clamped 0.017–10 s/frame)
- 1280x720 output, video-only (no audio)
- Auto-deletes fullday videos older than 10 days
https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ
Outis