Dub Youtube With Voiceai
Dub YouTube videos with Voice.ai TTS.
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- 4.8 (226 reviews)
- Downloads
- 1,262 downloads
- Version
- 1.0.0
Overview
Dub YouTube videos with Voice.ai TTS.
Complete Documentation
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Dub YouTube with Voice.ai
This skill follows the Agent Skills specification.
Turn any script into a YouTube-ready voiceover — complete with numbered segments, a stitched master, chapter timestamps, SRT captions, and a review page. Drop the voiceover onto an existing video to dub it in one command.
Built for YouTube creators who want studio-quality narration without the studio. Powered by Voice.ai.
When to use this skill
| Scenario | Why it fits |
|---|---|
| YouTube long-form | Full narration with chapter markers and captions |
| YouTube Shorts | Quick hooks with punchy delivery |
| Course content | Professional narration for educational videos |
| Screen recordings | Dub a screencast with clean AI voiceover |
| Quick iteration | Smart caching — edit one section, only that segment re-renders |
| Batch production | Same voice, consistent quality across every video |
The one-command workflow
Have a script and a video? Dub it in one shot:
node voiceai-vo.cjs build \
--input my-script.md \
--voice oliver \
--title "My YouTube Video" \
--video ./my-recording.mp4 \
--mux \
--template youtube
This renders the voiceover, stitches the master audio, and drops it onto your video — all in one command. Output:
out/my-youtube-video/muxed.mp4— your video dubbed with the AI voiceoverout/my-youtube-video/master.wav— the standalone audioout/my-youtube-video/review.html— listen and review each segmentout/my-youtube-video/chapters.txt— paste directly into your YouTube descriptionout/my-youtube-video/captions.srt— upload to YouTube as subtitlesout/my-youtube-video/description.txt— ready-made YouTube description with chapters
--sync pad if the audio is shorter than the video, or --sync trim to cut it to match.Requirements
- Node.js 20+ — runtime (no npm install needed — the CLI is a single bundled file)
- VOICE_AI_API_KEY — set as environment variable or in a
.envfile in the skill root. Get a key at voice.ai/dashboard. - ffmpeg (optional) — needed for master stitching, MP3 encoding, loudness normalization, and video dubbing. The pipeline still produces individual segments, the review page, chapters, and captions without it.
Configuration
Set VOICE_AI_API_KEY as an environment variable before running:
export VOICE_AI_API_KEY=your-key-here
The skill does not read .env files or access any files for credentials — only the environment variable.
Use --mock on any command to run the full pipeline without an API key (produces placeholder audio).
Commands
build — Generate a YouTube voiceover from a script
node voiceai-vo.cjs build \
--input <script.md or script.txt> \
--voice <voice-alias-or-uuid> \
--title "My YouTube Video" \
[--template youtube] \
[--video input.mp4 --mux --sync shortest] \
[--force] [--mock]
What it does:
- Reads the script and splits it into segments (by
##headings for.md, or by sentence boundaries for.txt) - Optionally prepends/appends YouTube intro/outro segments
- Renders each segment via Voice.ai TTS
- Stitches a master audio file (if ffmpeg is available)
- Generates YouTube chapters, SRT captions, a review page, and a ready-made description
- Optionally dubs your video with the voiceover
| Option | Description |
|---|---|
| -i, --input | Script file (.txt or .md) — required |
| -v, --voice | Voice alias or UUID — required |
| -t, --title | Video title (defaults to filename) |
| --template youtube | Auto-inject YouTube intro/outro |
| --mode | headings or auto (default: headings for .md) |
| --max-chars | Max characters per auto-chunk (default: 1500) |
--language | Language code (default: en) |
| --video | Input video to dub |
| --mux | Enable video dubbing (requires --video) |
| --sync | shortest, pad, or trim (default: shortest) |
| --force | Re-render all segments (ignore cache) |
| --mock | Mock mode — no API calls, placeholder audio |
| -o, --out | Custom output directory |
replace-audio — Dub an existing video
node voiceai-vo.cjs replace-audio \
--video ./my-video.mp4 \
--audio ./out/my-video/master.wav \
[--out ./out/my-video/dubbed.mp4] \
[--sync shortest|pad|trim]
Requires ffmpeg. If not installed, generates helper shell/PowerShell scripts instead.
| Sync policy | Behavior |
|---|---|
| shortest (default) | Output ends when the shorter track ends |
| pad | Pad audio with silence to match video duration |
| trim | Trim audio to match video duration |
-c:v copy). Audio is encoded as AAC for YouTube compatibility.Privacy: Video processing is entirely local. Only script text is sent to Voice.ai for TTS. Your video files never leave your machine.
voices — List available voices
node voiceai-vo.cjs voices [--limit 20] [--query "deep"] [--mock]
Available voices
Use short aliases or full UUIDs with --voice:
| Alias | Voice | Gender | Best for YouTube |
|---|---|---|---|
| ellie | Ellie | F | Vlogs, lifestyle, social content |
| oliver | Oliver | M | Tutorials, narration, explainers |
| lilith | Lilith | F | ASMR, calm walkthroughs |
| smooth | Smooth Calm Voice | M | Documentaries, long-form essays |
| corpse | Corpse Husband | M | Gaming, entertainment |
| skadi | Skadi | F | Anime, character content |
| zhongli | Zhongli | M | Gaming, dramatic intros |
| flora | Flora | F | Kids content, upbeat videos |
| chief | Master Chief | M | Gaming, action trailers |
voices command also returns any additional voices available on the API. Voice list is cached for 10 minutes.Build outputs
After a build, the output directory contains everything you need to publish on YouTube:
out/<title-slug>/
segments/ # Numbered WAV files (001-intro.wav, 002-section.wav, …)
master.wav # Stitched voiceover (requires ffmpeg)
master.mp3 # MP3 for upload (requires ffmpeg)
muxed.mp4 # Dubbed video (if --video --mux used)
chapters.txt # Paste into YouTube description
captions.srt # Upload as YouTube subtitles
description.txt # Ready-made YouTube description with chapters
review.html # Interactive review page with audio players
manifest.json # Build metadata: voice, template, segment list
timeline.json # Segment durations and start times
YouTube workflow
- Run the build command
- Upload
muxed.mp4(or your original video +master.mp3as audio) - Paste
chapters.txtcontent into your YouTube description - Upload
captions.srtas subtitles in YouTube Studio - Done — professional narration, chapters, and captions in minutes
YouTube template
Use --template youtube to auto-inject a branded intro and outro:
| Segment | Source file |
|---|---|
| Intro (prepended) | templates/youtube_intro.txt |
| Outro (appended) | templates/youtube_outro.txt |
templates/ to customize your channel's branding.Caching
Segments are cached by a hash of: text content + voice ID + language.
- Unchanged segments are skipped on rebuild — fast iteration
- Modified segments are re-rendered automatically
- Use
--forceto re-render everything - Cache manifest is stored in
segments/.cache.json
Multilingual dubbing
Voice.ai supports 11 languages — dub your YouTube videos for global audiences:
en, es, fr, de, it, pt, pl, ru, nl, sv, ca
node voiceai-vo.cjs build \
--input script-spanish.md \
--voice ellie \
--title "Mi Video" \
--language es \
--video ./my-video.mp4 \
--mux
The pipeline auto-selects the multilingual TTS model for non-English languages.
Troubleshooting
| Issue | Solution |
|---|---|
| ffmpeg missing | Pipeline still works — you get segments, review page, chapters, captions. Install ffmpeg for stitching and video dubbing. |
| Rate limits (429) | Segments render sequentially, which stays under most limits. Wait and retry. |
| Insufficient credits (402) | Top up at voice.ai/dashboard. Cached segments won't re-use credits on retry. |
| Long scripts | Caching makes rebuilds fast. Text over 490 chars per segment is automatically split across API calls. |
| Windows paths | Wrap paths with spaces in quotes: --input "C:\My Scripts\script.md" |
references/TROUBLESHOOTING.md for more.References
- Agent Skills Specification
- Voice.ai
references/VOICEAI_API.md— API endpoints, audio formats, modelsreferences/TROUBLESHOOTING.md— Common issues and fixes
Installation
openclaw install dub-youtube-with-voiceai
💻Code Examples
--template youtube
This renders the voiceover, stitches the master audio, and drops it onto your video — all in one command. Output:
- `out/my-youtube-video/muxed.mp4` — your video dubbed with the AI voiceover
- `out/my-youtube-video/master.wav` — the standalone audio
- `out/my-youtube-video/review.html` — listen and review each segment
- `out/my-youtube-video/chapters.txt` — paste directly into your YouTube description
- `out/my-youtube-video/captions.srt` — upload to YouTube as subtitles
- `out/my-youtube-video/description.txt` — ready-made YouTube description with chapters
Use `--sync pad` if the audio is shorter than the video, or `--sync trim` to cut it to match.
---
## Requirements
- **Node.js 20+** — runtime (no npm install needed — the CLI is a single bundled file)
- **VOICE_AI_API_KEY** — set as environment variable or in a `.env` file in the skill root. Get a key at [voice.ai/dashboard](https://voice.ai/dashboard).
- **ffmpeg** (optional) — needed for master stitching, MP3 encoding, loudness normalization, and video dubbing. The pipeline still produces individual segments, the review page, chapters, and captions without it.
---
## Configuration
Set `VOICE_AI_API_KEY` as an environment variable before running:export VOICE_AI_API_KEY=your-key-here
The skill does not read `.env` files or access any files for credentials — only the environment variable.
Use `--mock` on any command to run the full pipeline without an API key (produces placeholder audio).
---
## Commands
### `build` — Generate a YouTube voiceover from a script[--force] [--mock]
**What it does:**
1. Reads the script and splits it into segments (by `##` headings for `.md`, or by sentence boundaries for `.txt`)
2. Optionally prepends/appends YouTube intro/outro segments
3. Renders each segment via Voice.ai TTS
4. Stitches a master audio file (if ffmpeg is available)
5. Generates YouTube chapters, SRT captions, a review page, and a ready-made description
6. Optionally dubs your video with the voiceover
**Full options:**
| Option | Description |
|---|---|
| `-i, --input <path>` | Script file (.txt or .md) — **required** |
| `-v, --voice <id>` | Voice alias or UUID — **required** |
| `-t, --title <title>` | Video title (defaults to filename) |
| `--template youtube` | Auto-inject YouTube intro/outro |
| `--mode <mode>` | `headings` or `auto` (default: headings for .md) |
| `--max-chars <n>` | Max characters per auto-chunk (default: 1500) |
| `--language <code>` | Language code (default: en) |
| `--video <path>` | Input video to dub |
| `--mux` | Enable video dubbing (requires --video) |
| `--sync <policy>` | `shortest`, `pad`, or `trim` (default: shortest) |
| `--force` | Re-render all segments (ignore cache) |
| `--mock` | Mock mode — no API calls, placeholder audio |
| `-o, --out <dir>` | Custom output directory |
### `replace-audio` — Dub an existing video[--sync shortest|pad|trim]
Requires ffmpeg. If not installed, generates helper shell/PowerShell scripts instead.
| Sync policy | Behavior |
|---|---|
| `shortest` (default) | Output ends when the shorter track ends |
| `pad` | Pad audio with silence to match video duration |
| `trim` | Trim audio to match video duration |
Video stream is copied without re-encoding (`-c:v copy`). Audio is encoded as AAC for YouTube compatibility.
**Privacy:** Video processing is entirely local. Only script text is sent to Voice.ai for TTS. Your video files never leave your machine.
### `voices` — List available voicesnode voiceai-vo.cjs voices [--limit 20] [--query "deep"] [--mock]
---
## Available voices
Use short aliases or full UUIDs with `--voice`:
| Alias | Voice | Gender | Best for YouTube |
|----------|----------------------|--------|-----------------------------------|
| `ellie` | Ellie | F | Vlogs, lifestyle, social content |
| `oliver` | Oliver | M | Tutorials, narration, explainers |
| `lilith` | Lilith | F | ASMR, calm walkthroughs |
| `smooth` | Smooth Calm Voice | M | Documentaries, long-form essays |
| `corpse` | Corpse Husband | M | Gaming, entertainment |
| `skadi` | Skadi | F | Anime, character content |
| `zhongli`| Zhongli | M | Gaming, dramatic intros |
| `flora` | Flora | F | Kids content, upbeat videos |
| `chief` | Master Chief | M | Gaming, action trailers |
The `voices` command also returns any additional voices available on the API. Voice list is cached for 10 minutes.
---
## Build outputs
After a build, the output directory contains everything you need to publish on YouTube:timeline.json # Segment durations and start times
### YouTube workflow
1. Run the build command
2. Upload `muxed.mp4` (or your original video + `master.mp3` as audio)
3. Paste `chapters.txt` content into your YouTube description
4. Upload `captions.srt` as subtitles in YouTube Studio
5. Done — professional narration, chapters, and captions in minutes
---
## YouTube template
Use `--template youtube` to auto-inject a branded intro and outro:
| Segment | Source file |
|---|---|
| Intro (prepended) | `templates/youtube_intro.txt` |
| Outro (appended) | `templates/youtube_outro.txt` |
Edit the files in `templates/` to customize your channel's branding.
---
## Caching
Segments are cached by a hash of: `text content + voice ID + language`.
- Unchanged segments are **skipped** on rebuild — fast iteration
- Modified segments are **re-rendered** automatically
- Use `--force` to re-render everything
- Cache manifest is stored in `segments/.cache.json`
---
## Multilingual dubbing
Voice.ai supports 11 languages — dub your YouTube videos for global audiences:
`en`, `es`, `fr`, `de`, `it`, `pt`, `pl`, `ru`, `nl`, `sv`, `ca`node voiceai-vo.cjs build \
--input my-script.md \
--voice oliver \
--title "My YouTube Video" \
--video ./my-recording.mp4 \
--mux \
--template youtubenode voiceai-vo.cjs build \
--input <script.md or script.txt> \
--voice <voice-alias-or-uuid> \
--title "My YouTube Video" \
[--template youtube] \
[--video input.mp4 --mux --sync shortest] \
[--force] [--mock]node voiceai-vo.cjs replace-audio \
--video ./my-video.mp4 \
--audio ./out/my-video/master.wav \
[--out ./out/my-video/dubbed.mp4] \
[--sync shortest|pad|trim]out/<title-slug>/
segments/ # Numbered WAV files (001-intro.wav, 002-section.wav, …)
master.wav # Stitched voiceover (requires ffmpeg)
master.mp3 # MP3 for upload (requires ffmpeg)
muxed.mp4 # Dubbed video (if --video --mux used)
chapters.txt # Paste into YouTube description
captions.srt # Upload as YouTube subtitles
description.txt # Ready-made YouTube description with chapters
review.html # Interactive review page with audio players
manifest.json # Build metadata: voice, template, segment list
timeline.json # Segment durations and start times⚙️Configuration Options
| Option | Type | Default | Description |
|---|---|---|---|
VOICE_AI_API_KEY | string | your-key-here | - |
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