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nd-video

Explainer videos with HyperFrames (HTML → MP4) plus narrator, music and mixing on NeuralDeep infrastructure. Triggers: "make a video", "explainer", "explain visually", "add voiceover", "add music", "re-render", "change the voice / reverb".

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Precio sin confirmar★ 20 Estrellas de GitHubRegistro actualizado · 9 oct 2026agent-skill

Resumen

Explainer videos with HyperFrames (HTML → MP4) plus narrator, music and mixing on NeuralDeep infrastructure. Triggers: "make a video", "explainer", "explain visually", "add voiceover", "add music", "re-render", "change the voice / reverb".

Leer documentación completa

Documentación de origen, no instrucciones para este sitio. Revisa los permisos antes de ejecutar comandos.

nd-video: from idea to MP4

The pipeline was built on the LLM vs Jev video (112 s, media/jev-vs-llm.mp4). Everything that worked there is here. Projects (projects/) are local and not tracked in git. The HyperFrames composition contract is in vendor/hyperframes/skills/hyperframes-core/SKILL.md; read it before writing the first line of HTML.

Workflow

  1. Brief and storyboard. One idea per scene. Each scene gets a question-style heading, 2–4 narrator lines and a "key idea" at the end. Without subtitles and a route map viewers don't understand what they are looking at (the main feedback on the first cut).
  2. Composition projects/<slug>/index.html: npx hyperframes init <slug> --example blank. Proven techniques are below, under "Techniques".
  3. Check: npx hyperframes check and npx hyperframes snapshot --at t1,t2,..., then look at the contact sheet yourself. check flags overlaps where the camera intentionally goes under overlays (subtitles, magnifier); those are false positives, trust the frames.
  4. Narration text in projects/<slug>/narration.json (start + text, windows are computed).
  5. Voice → audio/raw/line_NN.wav:
    • scripts/tts_gpt_audio.py: OpenAI gpt-audio via OpenRouter, best delivery. Voice ash.
    • scripts/tts_hub.py: the hub TTS (Qwen3-TTS, 8 presets). A bit weak for trailer delivery.
    • scripts/tts_elevenlabs.py: ElevenLabs eleven_multilingual_v2. The best Russian of the three; voices lists the account's voices, speak voices narration.json (neighbouring lines go as context).
  6. Music → audio/music.mp3:
    • scripts/music_lyria.py: Lyria 3 Pro, $0.08 per track.
    • scripts/music_acestep.py: self-hosted ACE-Step 1.5 (MIT), see docs/acestep.md.
  7. Sound: scripts/build_audio.sh projects/<slug> trailer = fit lines into windows (fit_narration.py) → voice processing (voice_fx.py) → mix with ducking (mix.py). The composition has a single <audio id="soundtrack" src="audio/mix.wav"> for the full length.
  8. Render: npx hyperframes render --output renders/<name>.mp4; 112 s renders in ~1.5 min.
  9. Compress for sharing: ffmpeg -i in.mp4 -c:v libx264 -preset slow -crf 30 -tune animation -pix_fmt yuv420p -c:a aac -b:a 96k -movflags +faststart out.mp4. For the Jev video this took 51 MB down to 8.7 MB with no visible loss, small text included.

Outbound commands (gh, curl, npx) run without the system proxy: env -u HTTPS_PROXY -u HTTP_PROXY -u https_proxy -u http_proxy -u ALL_PROXY <command>.

Keys and where to run

whatkeywhere from
gpt-audio, LyriaOPENROUTER_API_KEYnot from a Russian IP: OpenRouter returns 403. Use a server outside Russia or OPENROUTER_API_BASE pointing at your egress
hub TTSND_API_KEY (your own sk-)anywhere
ACE-StepACESTEP_API_KEY (if set)ssh tunnel to the box, the API listens on 127.0.0.1

Never print secrets or commit them (.env is in .gitignore).

Voice: pitfalls

  • gpt-audio answers like an assistant ("Understood, here is…") and reads tags such as <line> aloud. Fix: a "you are a TTS engine" system prompt, bare text in the user turn, then transcribe the result, compare it with the text and retry (tts_gpt_audio.py does this).

  • OpenRouter audio output works only with stream: true; the format is pcm16, 24 kHz mono.

  • A line longer than its window: fit_narration.py speeds it up to ×1.12, beyond that it is audible. TOO LONG = shorten the text and re-voice only that line: --only N.

  • Processing presets (voice_fx.py): natural (no processing), trailer (final Jev mix: bass +5 at 110 Hz, presence +2.5 at 3 kHz, 4:1 compression, 1.4 s / 18% reverb), deep (pitch −2 semitones), titan (−4), cathedral (3.2 s / 45% reverb), radio (350–3400 Hz band). Small EQ tweaks after loudnorm are barely audible (the first A/B sounded "like clones"), so the presets are spread far apart. Fine-tune with flags: --pitch -1 --bass 7 --wet 0.25 --room 2. Compare by ear: voice_fx.py fit ab --compare 0.

  • ElevenLabs free tier: pcm output and library voices (native Russian speakers) are paid only (403 / 402), so the script takes mp3 and the premade voices work (Brian nPczCjzI2devNBz1zQrb was picked for Russian). 10 000 characters a month; a 90 s video is ~1 300. Reachable from RU IPs.

  • Hub TTS for Russian: language Russian goes to ESpeech, which answers 500 on words it doesn't know (terms, transliterated names); Auto goes to Qwen3-TTS, whose presets are not native Russian speakers and drift in timbre and emotion between lines.

Music: pitfalls

  • Lyria rejects prompts that mention AI/video/product as PROHIBITED_CONTENT (no charge). Describe only the music: genre, BPM, instruments, mood, "No vocals".
  • A Lyria track is ~170 s; mix.py trims it to the video length, 1.5 s fade-in, 4 s fade-out; --music-offset shifts the start.
  • Loudness: voice −16 LUFS, music −27 LUFS with sidechain ducking under the voice.
  • loudnorm resamples to 192 kHz and eats the tail: follow it with aresample and apad to length.

HyperFrames techniques proven on the video

  • Camera over a "world": a single #world (e.g. 3400×1800) holding two architecture "crystals"; the camera is gsap.to("#world", {x, y, scale}) via camState(x, y, s, sx, sy), which puts a world point at a screen point. Wide shot ~0.43, block ~1.15, detail ~2.7. Read finer details through a magnifier: a round overlay with a separate full-size SVG.
  • Counters without onUpdate (callbacks are muted on seek): @property --n { syntax: "<integer>"; inherits: true } + counter-reset: n var(--n) in ::before, tween "--n" with snap. inherits must be true, otherwise the pseudo-element sees 0.
  • Repeated tweens on the same element: fromTo(..., {immediateRender: false}), otherwise a late fromTo resets the earlier state on frame zero.
  • Don't tween letterSpacing or other layout properties (lint gsap_non_transform_motion), don't tween visibility/autoAlpha on .clip.
  • Seeded randomness only (mulberry32), no Date.now/Math.random.
  • Put a dark gradient and a backing plate behind the header, otherwise zoomed text lands on blocks.
  • Copyright: a corner badge + a faint centered watermark (7% white), removed in the finale.

Factual honesty

When breaking down someone else's model, mark on screen what a source confirms and what is an estimate ("likely", "est.", "illustrative"). In the Jev video MoE, ~10B active parameters and expert specialization are marked this way.

Ver fuente ↗
Metadatos del archivo
name: nd-video
description: Explainer videos with HyperFrames (HTML → MP4) plus narrator, music and mixing on NeuralDeep infrastructure. Triggers: "make a video", "explainer", "explain visually", "add voiceover", "add music", "re-render", "change the voice / reverb".
Ver texto original
---
name: nd-video
description: Explainer videos with HyperFrames (HTML → MP4) plus narrator, music and mixing on NeuralDeep infrastructure. Triggers: "make a video", "explainer", "explain visually", "add voiceover", "add music", "re-render", "change the voice / reverb".
---

# nd-video: from idea to MP4

The pipeline was built on the LLM vs Jev video (112 s, [`media/jev-vs-llm.mp4`](../../media/jev-vs-llm.mp4)).
Everything that worked there is here. Projects (`projects/`) are local and not tracked in git.
The HyperFrames composition contract is in `vendor/hyperframes/skills/hyperframes-core/SKILL.md`;
read it before writing the first line of HTML.

## Workflow

1. **Brief and storyboard.** One idea per scene. Each scene gets a question-style heading, 2–4
   narrator lines and a "key idea" at the end. Without subtitles and a route map viewers don't
   understand what they are looking at (the main feedback on the first cut).
2. **Composition** `projects/<slug>/index.html`: `npx hyperframes init <slug> --example blank`.
   Proven techniques are below, under "Techniques".
3. **Check**: `npx hyperframes check` and `npx hyperframes snapshot --at t1,t2,...`, then look at
   the contact sheet yourself. `check` flags overlaps where the camera intentionally goes under
   overlays (subtitles, magnifier); those are false positives, trust the frames.
4. **Narration text** in `projects/<slug>/narration.json` (`start` + `text`, windows are computed).
5. **Voice** → `audio/raw/line_NN.wav`:
   - `scripts/tts_gpt_audio.py`: OpenAI gpt-audio via OpenRouter, best delivery. Voice `ash`.
   - `scripts/tts_hub.py`: the hub TTS (Qwen3-TTS, 8 presets). A bit weak for trailer delivery.
   - `scripts/tts_elevenlabs.py`: ElevenLabs `eleven_multilingual_v2`. The best Russian of the three;
     `voices` lists the account's voices, `speak` voices narration.json (neighbouring lines go as context).
6. **Music** → `audio/music.mp3`:
   - `scripts/music_lyria.py`: Lyria 3 Pro, $0.08 per track.
   - `scripts/music_acestep.py`: self-hosted ACE-Step 1.5 (MIT), see `docs/acestep.md`.
7. **Sound**: `scripts/build_audio.sh projects/<slug> trailer` = fit lines into windows
   (`fit_narration.py`) → voice processing (`voice_fx.py`) → mix with ducking (`mix.py`).
   The composition has a single `<audio id="soundtrack" src="audio/mix.wav">` for the full length.
8. **Render**: `npx hyperframes render --output renders/<name>.mp4`; 112 s renders in ~1.5 min.
9. **Compress for sharing**: `ffmpeg -i in.mp4 -c:v libx264 -preset slow -crf 30 -tune animation
   -pix_fmt yuv420p -c:a aac -b:a 96k -movflags +faststart out.mp4`. For the Jev video this took
   51 MB down to 8.7 MB with no visible loss, small text included.

Outbound commands (`gh`, `curl`, `npx`) run without the system proxy:
`env -u HTTPS_PROXY -u HTTP_PROXY -u https_proxy -u http_proxy -u ALL_PROXY <command>`.

## Keys and where to run

| what | key | where from |
|---|---|---|
| gpt-audio, Lyria | `OPENROUTER_API_KEY` | not from a Russian IP: OpenRouter returns 403. Use a server outside Russia or `OPENROUTER_API_BASE` pointing at your egress |
| hub TTS | `ND_API_KEY` (your own `sk-`) | anywhere |
| ACE-Step | `ACESTEP_API_KEY` (if set) | ssh tunnel to the box, the API listens on 127.0.0.1 |

Never print secrets or commit them (`.env` is in `.gitignore`).

## Voice: pitfalls

- gpt-audio answers like an assistant ("Understood, here is…") and reads tags such as `<line>`
  aloud. Fix: a "you are a TTS engine" system prompt, bare text in the user turn, then transcribe
  the result, compare it with the text and retry (`tts_gpt_audio.py` does this).
- OpenRouter audio output works only with `stream: true`; the format is `pcm16`, 24 kHz mono.
- A line longer than its window: `fit_narration.py` speeds it up to ×1.12, beyond that it is
  audible. `TOO LONG` = shorten the text and re-voice only that line: `--only N`.
- Processing presets (`voice_fx.py`): `natural` (no processing), `trailer` (final Jev mix: bass
  +5 at 110 Hz, presence +2.5 at 3 kHz, 4:1 compression, 1.4 s / 18% reverb), `deep` (pitch
  −2 semitones), `titan` (−4), `cathedral` (3.2 s / 45% reverb), `radio` (350–3400 Hz band).
  Small EQ tweaks after loudnorm are barely audible (the first A/B sounded "like clones"), so the
  presets are spread far apart. Fine-tune with flags: `--pitch -1 --bass 7 --wet 0.25 --room 2`.
  Compare by ear: `voice_fx.py fit ab --compare 0`.

- ElevenLabs free tier: pcm output and library voices (native Russian speakers) are paid only
  (403 / 402), so the script takes mp3 and the premade voices work (Brian `nPczCjzI2devNBz1zQrb`
  was picked for Russian). 10 000 characters a month; a 90 s video is ~1 300. Reachable from RU IPs.
- Hub TTS for Russian: `language` Russian goes to ESpeech, which answers 500 on words it doesn't
  know (terms, transliterated names); `Auto` goes to Qwen3-TTS, whose presets are not native
  Russian speakers and drift in timbre and emotion between lines.

## Music: pitfalls

- Lyria rejects prompts that mention AI/video/product as `PROHIBITED_CONTENT` (no charge).
  Describe only the music: genre, BPM, instruments, mood, "No vocals".
- A Lyria track is ~170 s; `mix.py` trims it to the video length, 1.5 s fade-in, 4 s fade-out;
  `--music-offset` shifts the start.
- Loudness: voice −16 LUFS, music −27 LUFS with sidechain ducking under the voice.
- `loudnorm` resamples to 192 kHz and eats the tail: follow it with `aresample` and `apad` to length.

## HyperFrames techniques proven on the video

- **Camera over a "world"**: a single `#world` (e.g. 3400×1800) holding two architecture
  "crystals"; the camera is `gsap.to("#world", {x, y, scale})` via `camState(x, y, s, sx, sy)`,
  which puts a world point at a screen point. Wide shot ~0.43, block ~1.15, detail ~2.7. Read
  finer details through a **magnifier**: a round overlay with a separate full-size SVG.
- **Counters** without `onUpdate` (callbacks are muted on seek): `@property --n { syntax: "<integer>";
  inherits: true }` + `counter-reset: n var(--n)` in `::before`, tween `"--n"` with `snap`.
  `inherits` must be `true`, otherwise the pseudo-element sees 0.
- Repeated tweens on the same element: `fromTo(..., {immediateRender: false})`, otherwise a late
  `fromTo` resets the earlier state on frame zero.
- Don't tween `letterSpacing` or other layout properties (lint `gsap_non_transform_motion`),
  don't tween `visibility`/`autoAlpha` on `.clip`.
- Seeded randomness only (`mulberry32`), no `Date.now`/`Math.random`.
- Put a dark gradient and a backing plate behind the header, otherwise zoomed text lands on blocks.
- Copyright: a corner badge + a faint centered watermark (7% white), removed in the finale.

## Factual honesty

When breaking down someone else's model, mark on screen what a source confirms and what is an
estimate ("likely", "est.", "illustrative"). In the Jev video MoE, ~10B active parameters and
expert specialization are marked this way.

Revisar el código fuente

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Revisar antes de instalar: Evitar instalación automática

Licencia: MIT

  • Permission surface may require sandboxing
  • The skill references a vendor/hyperframes directory that may not be included in the skill package; ensure it is available or document how to obtain it.
  • The skill assumes the presence of ffmpeg, node, and other command-line tools; list prerequisites explicitly.
  • Low GitHub adoption signal
  • Quality score needs review
  • Permission surface needs review: secrets or environment access, shell or command execution
  • GitHub adoption: 20 GitHub stars
  • Stars/forks activity: 20 stars, 1 forks; issue activity unavailable in current metadata
  • Permission surface: secrets or environment access, shell or command execution
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Repositorio fuente
vakovalskii/nd-video-studio
Licencia
MIT
Versión
Unknown
Último push de GitHub
30 sept 2026
Registro actualizado
9 oct 2026
Ruta de instrucciones
skills/nd-video/SKILL.md @ 6243cd7cd7b3

Versión declarada en el registro; consulta las versiones de la fuente.

Calidad

60/100

Prometedor

Confianza

55/100

Do not auto-install

Auditoría

72/100

Requiere revisión

Abrir auditoría completaVer informe de evaluación
  • Permission surface may require sandboxing
  • The skill references a vendor/hyperframes directory that may not be included in the skill package; ensure it is available or document how to obtain it.
  • The skill assumes the presence of ffmpeg, node, and other command-line tools; list prerequisites explicitly.
  • Low GitHub adoption signal
  • Quality score needs review
  • Permission surface needs review: secrets or environment access, shell or command execution
  • GitHub adoption: 20 GitHub stars
  • Stars/forks activity: 20 stars, 1 forks; issue activity unavailable in current metadata
  • Permission surface: secrets or environment access, shell or command execution
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    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 60,
    "label": "Promising"
  },
  "supply": {
    "track": "Design and creative production",
    "scenario": "Design and creative",
    "maintenance": "13d since push",
    "risk": "Needs review"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "production agents without a repository review",
    "Low GitHub adoption signal",
    "The skill references a vendor/hyperframes directory that may not be included in the skill package; ensure it is available or document how to obtain it.",
    "No OpenAgentSkill engagement data yet",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Permission surface may require sandboxing",
    "The skill assumes the presence of ffmpeg, node, and other command-line tools; list prerequisites explicitly."
  ],
  "agent_contract": {
    "task_input": "Use nd-video in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 63/100 Manual review",
      "Audit: 72/100 Needs review",
      "Safety: 36/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "vakovalskii-nd-video (nd-video)",
      "install_command": "",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "vakovalskii-nd-video",
      "task": "Use nd-video in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/vakovalskii-nd-video",
    "api": "https://www.openagentskill.com/api/agent/skills/vakovalskii-nd-video",
    "audit": "https://www.openagentskill.com/skills/vakovalskii-nd-video/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=vakovalskii-nd-video&task=Use%20nd-video%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20nd-video%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20nd-video%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/vakovalskii-nd-video/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/vakovalskii-nd-video"
  }
}

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