Security X-ray — our demo

One example among many. Don't reuse its story, arc, shots, props or timings.

Demo: Night Shift at Lane 3 《安檢口的夜班》 (51.9 s) · security-xray.mp4 · source in demo/

One night shift, 22:00 to 06:00, at the screening console of an international departures lane, seen only through the X-ray screen and the belt: the flow of bags, two real rules (power banks, liquids), six live crabs at 03:12, breakfast at dawn, the handover. No people are drawn; the operator exists as boxes, zooms, rulers and verdicts, and as a voice: a few dry English lines in the first person (Kokoro af_heart), with Chinese and English subtitles. The rules on screen are quoted from the Civil Aviation Administration of China in demo/FACTS.md; the lane, bags and numbers are invented.

Story & structure

Logline: in one night, one lane screens 1,284 bags; three of them are judged, and one of them moves.

Arc: power-on and the first bag (the scan curtain colours a suitcase; "I never see the passengers. Only what they pack.") → the flow (five items cut on the beat, the clock jumping; the colour code in two lines) → judgment one, a power bank (box, zoom, label photo, formula, the 100/160 Wh scale, ✓) → judgment two, a bottle (ruler, a 100 mL outline to scale, ✗, rescan without it; "The bottle stays. The bag flies.") → 03:12, a foam box the flat image cannot read even with organic strip → CT: six tied crabs, and one leg kicks twice, in silence → judgment three (✗ not in the cabin) → dawn: a lunch jar and keys, "Someone's breakfast", the runway lights go out → the summary table → "I know every one of them inside out." → the belt stops, standby, end card.

The lane is international on purpose: the 100 mL per-container rule applies to international flights from China (domestic flights forbid liquids in the cabin altogether), and it is the lane that stays open all night. The crabs are refused because the sources say live seafood may not be carried into the cabin.

Native moves spent: the scan curtain (opening and every bag), box, zoom, read (power bank), measure against a rule (bottle), rescan (bottle removed), material filter (organic strip on the crab box), into CT (the crabs), the shift (clock, counter, sky, summary).

Shots

Film time; the page warps story time so verdicts hold longer and still stretches get shorter (WARP in film.js; one zero-length stretch drops a montage item).

# Time Shot Camera Native move / note
1 0.0–4.5 Self-test (calibration bar, OK lines, panels lighting), clock 21:59:59 → 22:00; a suitcase crosses the curtain from 1.2 to 3.9, grey preview turning orange/green/blue; counter 0000 → 0001 booth wide with the night window and a departure rolling, push to the screen and drift towards the curtain signature 1: the scan curtain
2 4.5–10.0 Laptop (cells, key grid) · long umbrella (ribs, J-hook) · sneakers (eyelets) · steel flask (dark walls) · tray with a padlock (black core), belt, keys, watch, held a beat longer (8.5–10.0) so the run ends on a stop a new crop each second, on the beat, each brought in by a scan-line sweep; each image stamped with bag number and time the clock jumps on every cut
3 10.0–19.08 Scan-line sweep in; backpack; alarm 10.8; amber box on a brick; zoom ×2.9 to four cylindrical cells; panel: label photo 20000mAh 3.7V 74Wh, formula, 0–200 Wh scale with lines at 100 and 160, marker lands on 74 at 12.7; ✓ "可以隨身帶" at 15.25 outer push 1.0 → 1.22 with the operator zoom, locked from 12.7 judgment: 2.55 s hold, then the verdict
4 19.08–26.73 Scan-line sweep in; tote; alarm; rulers 21 cm × Ø 6.5 cm; "容器約 500 mL"; rule "國際航班：單個容器 ≤ 100 mL"; a dashed 100 mL container at the same scale; ✗ and a red strike at 22.88; rescan sweep 23.43–23.98, bottle gone, dashed outline "已取出" locked medium judgment: 2.5 s hold
5 26.73–28.85 A longer sweep (0.55 s) jumps to 03:12, counter 0811, rate 18/h; a taxiing aircraft behind the glass; a foam box of overlapping orange masses; box "不明有機物 × 6"; organic strip wipes it to green outlines; status UNCLEAR; CT key booth wide, slow push into the image the flat image fails
6 28.85–39.35 A short, dim digital tear into CT (the reconstruction settles out of noise); six tied mitten crabs in two layers (filler removed), big claws with the hairy mitten, eye stalks; orbit ≈190° falling from overhead; push and near-stop beside one crab whose rear leg is loose; the leg kicks at 30.7 and 31.03 with a CT motion ghost and a box; the machine flags "檢測到運動 MOTION DETECTED"; settle 32.05; numbers 1–6, "活蟹 × 6 · 已捆紮", rule; ✗ "不能帶進客艙" at 35.3 CT orbit with push and slowdown, locked from 32.35 signature 2; judgment (3.1 s hold)
7 39.35–43.85 A scan line sweeps the CT away back to the console; 05:52; a lunch jar on its side (three steel bowls, rice, an egg), spoon and keys; tag "早飯 BREAKFAST"; counter 1284 medium, then pull back 41.05–43.35 to the booth and the dawn sky; runway lights go out one by one from 42.65 time of day
8 43.85–48.1 Summary table over the dimmed image: bags 1,284 · bags opened 37 · power banks 412 · liquids 29 · crabs 6, each row with an X-ray icon, each row revealed by a scan line, one beep per row; complete at 46.2 the camera pushes back in from the dawn wide (no cut), then holds close held list
9 48.1–48.9 06:00; STOP key; the belt stops; the image dims to standby pull back from the summary to the booth (no cut) the last frame holds
10 48.9–51.9 End card on the standby screen slow push 0.84 → 0.98 end card

Transitions: no hard cut and no white flash anywhere. Between bags the next picture comes in behind an X-ray scan line moving right to left, the belt's direction (SWEEPS in film.js: 0.22 s in the montage, 0.3–0.55 s elsewhere; the outgoing frame is rendered once at the cut and held left of the line). Into CT a short tear whose noise stays dim; out of CT a sweep. Dawn → summary → stop is one camera move (pull back, push in, pull back). Subtitle cues less than 0.6 s apart share one plate, so it never blinks between lines.

Every text the viewer has to read passes core/render/readcheck.mjs (each Chinese and English line counted together); the holds after each verdict come from that rule.

Voice and subtitles

Thirteen cues, twenty sentence clips (demo/voice/lines.json), each placed by hand in VO in film.js and checked with asr_check.py (small.en). She speaks in the holds, never on an alarm or a verdict tone; the CT reveal (28.4–30.8) and the power-down are wordless.

Cue Time English (spoken) 中文
1 0.40–4.60 I never see the passengers. Only what they pack. 我從來看不見旅客，只看見他們裝了什麼。
2 4.62–8.02 Blue is metal. Orange is organic. 藍色是金屬，橙色是有機物。
3 8.05–10.85 Black: nothing gets through. 黑色，是射線穿不透。
4 11.4–15.1 A power bank. 74 watt-hours. 一個充電寶，74 瓦時。
5 15.45–19.06 Under 100, it stays in the bag. 不到 100，可以隨身帶。
6 20.2–22.75 500 milliliters. 500 毫升。
7 23.15–26.5 The bottle stays. The bag flies. 瓶子留下，包上飛機。
8 26.72–30.12 3 a.m. Six of something. 凌晨三點。六團東西。
9 31.3–35.5 Live crabs. Tied up, and one still kicking. 活螃蟹。捆好了，還有一隻在蹬腿。
10 35.55–38.9 Live seafood can't fly in the cabin. 活的海鮮，不能帶進客艙。
11 39.4–42.9 5:52. Someone's breakfast. 5:52。不知是誰的早飯。
12 42.95–45.55 Over 1,200 bags tonight. 今晚 1,200 多個包。
13 45.6–48.9 I know every one of them inside out. 每一個，我都從裡到外看過。

Subtitles are drawn by the page (the operator's log plate, bottom left) and exported to security-xray.srt from the same table.

Score structure

120 BPM, D dorian; cuts and scans on the beat.

Section Time Palette Notes
Power-on 0–1.0 contrabass D, bowed vibraphone A/D, console tones relays tick with the self-test
Flow 1.0–10.8 spiccato cellos in 8ths, pizzicato basses, pizzicato violin chords on the off-beat, hi-hat; bass drum + woodblock on every cut Dm–B♭–C–Am per bar
Judgment 1 10.8–15.25 timpani, tremolo violins (A/B♭), held cello, cello pizz heartbeat groove stops dead on the alarm
Clear 15.25 harp D-major arpeggio, strings chord, clear tone
Judgment 2 19.08–22.88 short groove, then the same suspense, lighter low D + timpani + buzzing refusal tone at 22.88; small harp figure on the rescan
03:12 26.73–28.85 cello and viola drone, four slow vibraphone notes the belt hum quieter
CT 28.85–39.35 gantry whir; a comic walk on cello pizz + staccato bassoon that stops before the leg; xylophone blips on each kick; marimba run as the crabs are counted; waiting pizz; trombone "wah-wah" on the refusal
Dawn 39.35–43.85 strings pad D–G–A, harp 16ths, glockenspiel on "breakfast", falling glockenspiel as the lights go out
Summary 43.85–48.1 held D chord (cellos, violas, violins), rising row beeps
Stop / end 48.1–51.9 motor winds down, thump, power-down sweep; harp D add9 and vibraphone under the end card 1.2 s fade at the end

Mix (audio.py): the voice is compressed and set by RMS 12.7 dB over the music and 7 dB over music plus foley while it speaks; under it the music ducks 4.4 dB and loses part of its 300 Hz–4 kHz band, the machine beds step back 3 dB. Music at −6 dB to the tones and foley, ducked 4.4 dB for 0.45 s under alarms, verdicts, the kicks and the beeps; 4th-order high-pass at 48 Hz; the master is −14 LUFS from mux.sh. All cue times come from events.json, so the score follows any retiming.

Palette & props

End card

On the standby screen, left-aligned in the image area: 安檢口的夜班 (Noto Sans SC 700, 76 px), Night Shift at Lane 3, a rule, 安檢 X 光 / SECURITY X-RAY in amber, LemoLab × Claude Opus 5.5; the dimmed clock (06:00) and counter (1284) stay in the right column, dawn behind the glass. The camera pushes in slowly so the sign-off line stays above 26 px. 3.0 s. The "LemoLab × Claude Opus 5.5" sign-off belongs to this library's demo only; a user's film carries no LemoLab credit and no copy of this card.

Build notes

demo/
  build.sh       one command: fonts and voice (if missing) → speech check → events → picture → mix → master → subtitles → readcheck → poster, styleframe
  index.html     two canvases (WebGL thickness + colouriser, 2D booth and console), fonts
  film.js        render(t): time warp, shots, console, booth and window, panels, CT, summary, end card, VO, SUBS, EV, TEXTS
  xr.js          material, closed-solid helpers, renderView / drawView (dual-energy colouriser)
  props.js       bags and trays;  crab.js  carapace, legs, claws, rope, the box and the leg that moves
  audio.py       voice + score + console tones + foley from events.json -> out/mix.wav
  voice/         lines.json (Kokoro af_heart, one sentence per clip, rendered to out/voice/; asr overrides for "552" and "1,200")
  tools/srt_from_events.py   subtitle cues from events.json
  make_fonts.py  Noto Sans SC subset (500, 700) from the variable font
  FACTS.md       rules, sources, quoted wording