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trx

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Agent-first CLI for audio/video transcription via Whisper

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# @crafter/trx

Agent-first CLI for audio/video transcription via [Whisper](https://github.com/ggml-org/whisper.cpp).

Downloads, cleans, and transcribes media from URLs or local files with machine-readable output designed for AI agents.

## Install

```bash
# Run instantly, no install needed (requires Bun)
npx @crafter/trx@latest init

# Or install globally
bun add -g @crafter/trx
trx init
```

`trx init` installs dependencies (`whisper-cli`, `yt-dlp`, `ffmpeg` via Homebrew), downloads a Whisper model, and optionally installs the agent skill for your AI coding tool.

### Skill Only

If you already have trx set up and just want the agent skill:

```bash
npx skills add crafter-station/trx -g
```

## Usage

```bash
# Transcribe a local file
trx recording.mp4

# Transcribe from URL (YouTube, Twitter, Instagram, etc.)
trx "https://youtube.com/watch?v=..."

# Agent-friendly JSON output
trx transcribe video.mp4 --output json

# Only get the text (saves tokens)
trx transcribe video.mp4 --fields text --output json

# Dry-run (validate without executing)
trx transcribe video.mp4 --dry-run --output json

# Specify language
trx transcribe video.mp4 --language es

# Keep fillers and false starts instead of a cleaned-up transcript
trx transcribe video.mp4 --words --language es --preset verbatim

# Schema introspection for agents
trx schema transcribe
```

### Verbatim transcripts

A transcriber cleans by default: it writes what it believes was meant, so hesitations,
stretched vowels and false starts are dropped as noise. That is what you want for captions
and the opposite of what you want when the transcript drives an edit, because those spans are
exactly the ones worth cutting.

`--preset verbatim` sends an initial prompt asking for a literal transcript. The prompt has to
be written in the language being spoken, so the preset needs `--language` and covers the
languages it has a prompt for (`de`, `en`, `es`, `fr`, `it`, `pt`). Any other language is an
error naming what is available rather than a prompt in the wrong language, which steers the
model worse than none. Use `--prompt "<text>"` to write your own.

Timestamps describe the file you handed in. The cleaning stage adjusts level and noise and
leaves duration alone, so a cue at 36.68s means 36.68s in the source. Up to 0.8.0 it also
removed silence, which moved every cue after the first removed pause: 1.572s of accumulated
drift on one 90.5s recording.

## Commands

| Command | Description |
|---------|-------------|
| `trx <input>` | Shorthand for `trx transcribe` |
| `trx init` | Install deps + download Whisper model |
| `trx transcribe <input>` | Full transcription pipeline |
| `trx doctor` | Check dependency status |
| `trx schema <resource>` | JSON schema introspection |

## Agent-First Design

Built following [agent-first CLI principles](https://justin.poehnelt.com/posts/rewrite-your-cli-for-ai-agents/):

- **`--output json`** auto-detects: table for TTY, JSON when piped
- **`--dry-run`** validates before executing
- **`--fields`** limits response size to protect agent context windows
- **`trx schema`** runtime introspection (no docs needed)
- **Input validation** rejects control characters, path traversals, URL-encoded strings
- **Ships with SKILL.md** for Claude Code agent post-processing

## Agent Skill

The bundled skill (`skills/trx/SKILL.md`) enables AI agents to:

1. Transcribe media via CLI
2. Post-process output (fix punctuation, accents, technical terms, repeated phrases)
3. Reference `whisper-fixes.md` for common Whisper mistake patterns

## Pipeline

```
Input (URL or file)
  |
  v
[yt-dlp] Download media (if URL)
  |
  v
[ffmpeg] Clean audio (noise reduction, normalization; duration preserved)
  |
  v
[whisper-cli] Transcribe (local Whisper model)
  |
  v
Output: .wav + .srt + .txt + JSON
```

## Configuration

Stored at `~/.trx/config.json` after `trx init`:

```json
{
  "modelPath": "~/.trx/models/ggml-small.bin",
  "modelSize": "small",
  "language": "auto",
  "threads": 8
}
```

Models: `tiny` (75MB) | `base` (142MB) | `small` (466MB) | `medium` (1.5GB) | `large` (3GB)

## License

MIT

trx

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