CrispASR Agent Transcriber

crispasr-agent-transcriber

Local-only transcription for Codex and MCP-based AI agents, powered by CrispASR. No cloud uploads, no API keys required for transcription.

GitHub Release | npm installer | PyPI package | MCP Registry

What it does

Give it a local audio or video file. It:

1. Probes the spoken language (English or Chinese) using CrispASR's FireRed LID.
2. Starts a local CrispASR server with the right backend -- Cohere Transcribe for English, Qwen3-ASR for Chinese.
3. Extracts audio from video with ffmpeg when needed.
4. Calls CrispASR's /v1/audio/transcriptions endpoint.
5. Writes the transcript and metadata to disk.
6. For video understanding, captures synchronized keyframes and writes an agent-readable manifest.

Everything runs on your machine. Media never leaves it.

Quick install for Codex

The plugin includes the Codex Skill, command-line tool, and MCP server. Media stays on your computer. Model files are never downloaded during install/update; use the explicit models command when you want the installer to fetch them.

1. Install prerequisites

Install Node.js 20 or newer, uv, and ffmpeg. The installer uses uv to provide Python.

node --version

uv --version ffmpeg -version

2. Run the installer

npx @emiyakatuz/crispasr-agent-transcriber@latest install

The installer:

• downloads the matching GitHub Release and verifies its SHA-256 checksum;
• installs the plugin under ~/plugins/crispasr-agent-transcriber;
• installs the Python and MCP dependencies;
• detects CUDA, Vulkan, or CPU and installs the best CrispASR build;
• registers the plugin in the Codex Personal marketplace;
• preserves existing models, binaries, and outputs during updates.

3. Add the local models

Download the recommended local English, Chinese, and language-detection bundle:

npx @emiyakatuz/crispasr-agent-transcriber@latest models

The command downloads only approved GGUF files into:

~/plugins/crispasr-agent-transcriber/models/

Then verify the installation:

npx @emiyakatuz/crispasr-agent-transcriber@latest doctor

4. Enable the plugin

With a Codex build that supports plugin commands, run:

codex plugin add crispasr-agent-transcriber@personal

If the CLI has no codex plugin command, open the Codex desktop Plugins view and install CrispASR Transcriber from the Personal marketplace. Start a new conversation, then ask:

Transcribe C:\path\to\sample.mp4 with CrispASR using auto language detection.

Save a verbose JSON transcript and an SRT subtitle file.

Update or uninstall

npx @emiyakatuz/crispasr-agent-transcriber@latest update

npx @emiyakatuz/crispasr-agent-transcriber@latest uninstall

Uninstall preserves local models, CrispASR binaries, and outputs. Use uninstall --purge-data only when those files should also be deleted. See Plugin installation for manual installation and troubleshooting.

Direct command-line use

After installation, you can run the transcription script without Codex:

Set-Location (Join-Path $HOME "plugins\crispasr-agent-transcriber")

uv run python scripts/transcribe.py sample.mp4 --profile auto --manage-server --models-dir models ` --format verbose_json

Use with other AI agents

The MCP server is the cross-agent interface. Any agent that supports MCP stdio can run the released package directly from GitHub:

uvx --from "crispasr-agent-transcriber[mcp] @ git+https://github.com/EmiyaKatuz/crispasr-agent-transcriber.git@v0.4.0" crispasr-agent-mcp

Use the same command and arguments in Claude Desktop, Cursor, or another MCP client. See AI agent integrations for a generic MCP configuration and Codex CLI command.

Maintainer publishing

End users do not need the release steps. Maintainers should follow the publishing guide for Codex Marketplace, PyPI, MCP Registry, and cross-agent distribution.

Required models

Install/update never downloads models. Use the explicit models command or download these three recommended GGUF files into a local directory such as models/:

Optional model IDs include english-q5-0, english-q5-1, english-q6, english-q8, english-f16, chinese-q8, chinese-f16, lid-q2, lid-q8, and lid-f16. Download a specific option with:

npx @emiyakatuz/crispasr-agent-transcriber@latest models --model-id english-q8

All three upstream model families are Apache 2.0 licensed.

For automatic English/Chinese routing, pass both ASR paths. The language probe runs first, and only the matching model is loaded:

--english-model models\cohere-transcribe-q4_k.gguf

--chinese-model models\qwen3-asr-1.7b-q4_k.gguf --lid-backend firered --lid-model models\firered-lid-q4_k.gguf

For an explicit english or chinese profile, --model remains available as a single-model override.

CrispASR binary management

The tool auto-detects, installs, and updates the CrispASR binary from GitHub releases.

When --manage-server is set and no binary is found, it auto-installs before starting the server.

GPU detection

On install and update, the tool checks your hardware:

1. CUDA -- nvidia-smi available, or CUDA_PATH / CUDA_HOME set, or CUDA in PATH -> downloads crispasr-*-cuda variant.
2. Vulkan -- vulkaninfo or VULKAN_SDK set (only when CUDA is absent) -> downloads crispasr-*-vulkan variant.
3. CPU -- fallback when no GPU toolkit is detected.

macOS always uses the universal binary.

Profiles

auto mode runs FireRed language detection on the media, then routes English to Cohere or Chinese to Qwen3-1.7B. Mixed or uncertain content stops with a clear error asking you to re-run with --profile english or --profile chinese.

Usage

Managed server (tool starts CrispASR for you)

uv run python scripts/transcribe.py sample.wav `

--profile auto --manage-server --models-dir models --format srt --out-dir outputs

Add --keep-server to leave the server running after transcription.

Manual server (you start CrispASR)

# Terminal 1 -- start the server

crispasr --server --backend cohere -m models\cohere-transcribe-q4_k.gguf --port 8080

Terminal 2 -- transcribe

uv run python scripts/transcribe.py sample.mp4 --profile english --server-url http://127.0.0.1:8080 ` --format verbose_json

If the running server's backend doesn't match the selected profile, the tool prints the exact command you need to start the correct server.

Output formats

A .metadata.json sidecar is always written alongside the transcript.

Video files

Video files are detected automatically. ffmpeg extracts the audio track to a temporary mono 16 kHz WAV before sending it to CrispASR. The temporary file is deleted when transcription finishes.

All CLI flags

--profile auto|english|chinese

--format text|verbose_json|srt|vtt|json --out-dir PATH --server-url URL --allow-remote-server --manage-server --keep-server --model PATH Local GGUF override for an explicit profile --english-model PATH Cohere model selected after English detection --chinese-model PATH Qwen3-ASR model selected after Chinese detection --models-dir PATH Directory containing approved local GGUF models --allow-model-auto-download --lid-model PATH Local LID model path --lid-backend firered|silero|ecapa|whisper --host HOST Managed server host (default 127.0.0.1) --port PORT Managed server port (default 8080) --language CODE Language hint for transcription --prompt TEXT Initial prompt/context --vad Enable voice activity detection --diarize Enable speaker diarization --diarize-method METHOD --hotwords WORD,WORD Comma-separated hotwords --no-timestamps --preprocess auto|always|never --api-key KEY If CRISPASR_API_KEYS is enabled --crispasr-bin-dir PATH --crispasr-bin PATH --install-crispasr --update-crispasr --crispasr-status --list-models --download-models --model-id MODEL_ID --overwrite-models

MCP server

uv sync --extra mcp

uv run --extra mcp crispasr-agent-mcp

Exposed tools:

Security model

• No cloud uploads. Media files stay on the local filesystem.
• No remote servers by default. --server-url only accepts localhost unless --allow-remote-server is explicitly passed.
• No URL inputs. Only local file paths are accepted. URLs, S3, and other remote schemes are rejected.
• No shell injection. ffmpeg is called with argument lists and shell=False. No user-controlled strings are interpolated into shell commands.
• No implicit model downloads. Install/update never downloads models, and CrispASR model auto-download (-m auto) requires --allow-model-auto-download. The models command and crispasr_download_models tool