An AI-powered skill that transcribes video audio and burns styled subtitles directly into the video file for social media and accessibility.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install free-subtitle-maker
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install free-subtitle-maker using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Free Subtitle Maker?
The free-subtitle-maker skill provides a streamlined workflow for content creators to add professional captions to their videos without the need for expensive software or complex manual editing. By leveraging the NemoVideo API, this Openclaw Skills integration handles the heavy lifting of speech-to-text transcription and frame-accurate video encoding directly in the cloud.
Users can simply upload a video and describe their desired style—from font colors to specific screen positioning—and the skill will automate the entire burn-in process. This results in a final video file that is immediately ready for distribution on platforms where sound-off viewing is common or accessibility is a priority, ensuring your content reaches a wider audience without the friction of separate subtitle files.
Free Subtitle Maker Use Cases
- Educators creating accessible lecture videos or screencasts for students with hearing impairments.
- Social media managers producing batches of short-form video content for platforms like Reels, TikTok, or LinkedIn.
- Independent filmmakers and journalists generating quick-turnaround captions for interview footage or documentary rough cuts.
- Content creators needing to burn subtitles into videos to ensure readability in sound-off environments.
How Free Subtitle Maker Works
- Authenticate with the NemoVideo API using a Client-ID and a NEMO_TOKEN session.
- Establish a project session to track the video editing lifecycle and maintain state.
- Upload the source video file (supporting mp4, mov, webm, and more) to the processing backend.
- Send natural language instructions via Server-Sent Events (SSE) to initiate the transcription and styling process.
- Poll the session state to verify that the transcription segments and style edits have been successfully applied to the draft.
- Execute the render command to burn the subtitles into the footage and retrieve a high-quality download URL.
Free Subtitle Maker Setup
To initialize the free-subtitle-maker, ensure you have your environment configured to interact with the NemoVideo API. You can obtain a free token by generating a client UUID:
# Create a unique client ID directory
mkdir -p ~/.config/nemovideo/
# Generate a UUID for your client
uuidgen > ~/.config/nemovideo/client_id
# Request an anonymous token from the NemoVideo API
curl -X POST https://mega-api-prod.nemovideo.ai/api/auth/anonymous-token \
-H "X-Client-Id: $(cat ~/.config/nemovideo/client_id)"
Free Subtitle Maker Data Schema & Taxonomy
The skill manages video projects using a structured session state that tracks media assets and timeline data:
| Field | Description |
|---|---|
draft |
The core project JSON containing tracks (t), track types (tt), and segments (sg). |
video_infos |
Metadata regarding the uploaded source, including resolution and duration. |
generated_media |
Repository of processed media segments and final rendered output URLs. |
track type 7 |
Specific track designation used for subtitle and text overlay data. |
Free Subtitle Maker Advanced Features
- Custom Subtitle Styling: Full control over font size, color, outlines, and screen placement via natural language prompts.
- Multi-Format Compatibility: Supports wide-ranging video and audio containers including avi, mkv, webm, and aac.
- Real-time Progress Monitoring: Handles long-running transcription tasks using SSE heartbeats to prevent timeouts.
- Dashboard Integration: Generates claimable session URLs allowing users to move from the AI agent to the NemoVideo web interface for manual fine-tuning.
- Optimized for Social: Automatically handles aspect ratio considerations for vertical (9:16) and horizontal (16:9) video formats.
SKILL.md
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