E1 · Engines
5 minRun "download site-movimento and test the engines".
Done when: 4/4 motores OK and saída: 0.
Lesson 6 · 18 min
Live background: video generated inside the site
A long opening film comes from several short clips chained together, each starting on the last real frame of the one before. The risk is a hidden cut in the middle of a clip. The site-movimento skill has gates that catch it. You run them on rehearsal clips, one continuous and one with a cut, without spending credits.
Start the lesson
In this lesson you will
- 1The seven steps of the site-movimento skill and where the gates come in
- 2The engine contract (Kling, Agnes, Kie, your own) tested without spending, with DRY_RUN
- 3Assemble the film and prove continuity; catch the hidden cut
- 4The copy gate in Portuguese, English, and Spanish
Goal: chain clips into a continuous film and prove with the site-movimento gates that there is no hidden cut.
01Chained clips, no jump
Step 4 of the skill (video). Click each stage.
Click each block in the diagram to see what it does.
Without a video engine, the skill makes the film in code (steps 1, 2, 5, 6, and 7 are the same). Pilot numbers: 300 Kling 3.0 credits at 720p, 285 frames in the horizontal film and 361 in the vertical one (README, 10/18/2026).
02The engine contract, without spending
With DRY_RUN=1 each engine only shows what it would do. The test checks all four.
Terminal · download site-movimento and test the engines
E=${TMPDIR:-/tmp}/ensaio-sites/a6; rm -rf "$E"; mkdir -p "$E"; cd "$E"
git clone -q https://github.com/inematds/site-movimento && git -C site-movimento checkout -q d9a43a4; echo "clone: $?"
bash site-movimento/skill/site-movimento/tests/motores-contrato.sh; echo "saída: $?"Example from the repository
clone: 0 OK kling OK agnes OK kie OK custom 4/4 motores OK saída: 0
No service was called: DRY_RUN exits before reading any key. Actually generating uses the account and credits of the engine you choose; the course doesn't do that.
03Two chained clips become the site's film
The rehearsal imitates the chaining: clip 2 starts at the zoom where clip 1 ended.
Terminal · chain, assemble, and prove continuity
K=~/projetos/formacao-cinema-ia-sites-v72/kit
E=${TMPDIR:-/tmp}/ensaio-sites/a6; SM=$E/site-movimento/skill/site-movimento/scripts
# dois clipes encadeados: o 2º começa exatamente onde o 1º terminou (zoom 1,25)
bash "$K/scripts/clipe.sh" "$K/exemplos/lente.jpg" "$E/c1.mp4" 4 1.0 1.25
bash "$K/scripts/clipe.sh" "$K/exemplos/lente.jpg" "$E/c2.mp4" 4 1.25 1.5
python3 "$SM/cortes.py" "$E/c1.mp4" "$E/c2.mp4" | sed "s#$E/##"; echo "cortes: ${PIPESTATUS[0]}"
rm -rf "$E/site"; cp -r "$K/site" "$E/site"
python3 "$SM/montar.py" "$E/site" "$E/c1.mp4:0:-1" "$E/c2.mp4:1:-1" | head -1 | sed "s#$E/##"
python3 "$SM/continuidade.py" "$E/site/frames" | sed "s#$E/##"; echo "saída: ${PIPESTATUS[0]}"Example from the repository
c1.mp4: 4,0 s · 24 fps · 1920×1080 c2.mp4: 4,0 s · 24 fps · 1920×1080 c1.mp4 quadros 97, mediana 1.00, piores [(77, 0.99), (90, 0.99)] ok c2.mp4 quadros 97, mediana 1.00, piores [(1, 0.99), (95, 0.99)] ok cortes: 0 site: 191 quadros, 3.4 MB, cor da emenda #050605 continuidade — site/frames: 48 quadros (a cada 4), mediana 0.983 PASSA — um movimento só saída: 0
4 s + 4 s = 191 frames (frame 0 of clip 2 is dropped so it isn't repeated). montar.py writes to site/frames, the folder the kit page already reads.
04The hidden cut
A clip that jumps scenes in the middle: the lens in the dark studio and, suddenly, on the light background.
Terminal · a clip with a cut
K=~/projetos/formacao-cinema-ia-sites-v72/kit
E=${TMPDIR:-/tmp}/ensaio-sites/a6; SM=$E/site-movimento/skill/site-movimento/scripts
# a clip with a hidden cut in the middle: the lens in the dark studio and, suddenly, on the light background
bash "$K/scripts/clipe.sh" "$K/exemplos/lente.jpg" "$E/a.mp4" 2 1.0 1.1
bash "$K/scripts/clipe.sh" "$K/exemplos/lente-clara.jpg" "$E/b.mp4" 2 1.1 1.2
ffmpeg -v error -y -i "$E/a.mp4" -i "$E/b.mp4" -filter_complex "[0:v][1:v]concat=n=2:v=1[v]" -map "[v]" -c:v libx264 -crf 18 "$E/c3.mp4"
python3 "$SM/cortes.py" "$E/c3.mp4" | sed "s#$E/##"; echo "saída: ${PIPESTATUS[0]}"Example from the repository
a.mp4: 2,0 s · 24 fps · 1920×1080 b.mp4: 2,0 s · 24 fps · 1920×1080 c3.mp4 quadros 97, mediana 1.00, piores [(48, 0.46), (72, 0.99)] CORTE no(s) quadro(s) [48] saída: 1
The frame pair at 48 drops to 0.46 against a median of 1.00: a cut. A cut between two dark, similar frames can slip past cortes.py; that's why the skill also runs continuidade.py and you watch the film.
05The clip queue
Paid clips go out in order, one at a time. Run it, interrupt it, and run it again: only what's missing comes back.
fila/
rodando/
pronto/
falhou/
Simulation in the browser: nothing is generated. The failure is on purpose, to show that only the clip with the cut comes back.
06The copy gate in three languages
The site-movimento version of lesson 3's gate: it reads Portuguese, English, and Spanish.
Terminal · copy gate on the kit page and on the bad example
K=~/projetos/formacao-cinema-ia-sites-v72/kit
P=${TMPDIR:-/tmp}/ensaio-sites/a6/site-movimento/skill/site-movimento/scripts/portao-texto.js
node "$P" "$K/site/index.html"; echo "saída: $?"
node "$P" "$K/exemplos/texto-ruim-pt.html" 2>&1 | head -5; echo "saída: ${PIPESTATUS[0]}"Example from the repository
✓ ~/projetos/formacao-cinema-ia-sites-v72/kit/site/index.html — texto limpo
saída: 0
✗ ~/projetos/formacao-cinema-ia-sites-v72/kit/exemplos/texto-ruim-pt.html — 3 defeito(s)
manda a pessoa rolar
…Aurora 35 Role para baixo e veja a lente de perto.…
narra a câmera
…e de perto. Um plano-sequência A câmera avança pelo vidro até o diafragma…
saída: 1The gate also fails an em dash, AI jargon ("revolucionário"), placeholder text, and the film frame repeated as an image right below it.
07Practice
The film's gates, without generating anything.
E2 · Continuous film
10 minRun "chain, assemble, and prove continuity". Then serve the ensaio's site/ folder and run verificar.mjs in it.
Done when: PASSA — um movimento só with saída: 0, and the verifier answers quadros: 191 (frames/) and OK: 3 de 3 posições.
E3 · Catch the cut
10 minRun "a clip with a cut". Then swap lente-clara.jpg for lente2.jpg (another dark photo) and run it again: note the worst pair and say why it passed.
Done when: With the light lens: CORTE no(s) quadro(s) [48] and saída: 1.
E4 · Your copy
10 minRun the copy gate on the page you're building.
Done when: texto limpo and saída: 0.
08Lesson quiz
The explanation appears after you answer.
Question 1 of 4
Where should clip 2 start from?
Correct
The engine never ends exactly on the keyframe. Starting from the last real frame (extracted pixels) makes the seam match by construction.Not that one
The engine never ends exactly on the keyframe. Starting from the last real frame (extracted pixels) makes the seam match by construction.Review: Chained clips, no jumpQuestion 2 of 4
cortes.py found a cut in the middle of clip 3. What does the skill tell you to do?
Correct
The person stops scrolling exactly at the cut. A fade or a flash draws attention; a bridge cuts again. Use a smaller camera step and redo it.Not that one
The person stops scrolling exactly at the cut. A fade or a flash draws attention; a bridge cuts again. Use a smaller camera step and redo it.Review: Chained clips, no jumpQuestion 3 of 4
Why does continuidade.py compare against the local median instead of a fixed threshold?
Correct
Smooth motion: each pair looks like its neighbors, however low the score. Cut: a sharp drop below the median of its neighbors. That is what the script itself explains in its header.Not that one
Smooth motion: each pair looks like its neighbors, however low the score. Cut: a sharp drop below the median of its neighbors. That is what the script itself explains in its header.Review: Chained clips, no jumpQuestion 4 of 4
What does DRY_RUN=1 guarantee in the engine test?
Correct
The script exits before reading a key or calling the network. It is the way to test the contract without spending anything.Not that one
The script exits before reading a key or calling the network. It is the way to test the contract without spending anything.Review: The engine contract, without spendingQuiz complete
You got {a} of {n} right. Get them all right and the lesson is marked as complete.Choose an option. The explanation appears after your attempt.
09In three sentences
ChainClip N starts on the last real frame of the previous one, in order.
Gatespinning, cuts, continuity; a cut never gets in.
No spendDRY_RUN and rehearsal clips prove the path before the generator.