Retrieve the transcript of a video from supported platforms (YouTube, Bilibili, Vimeo, etc.). Accepts various URL formats and returns the full transcript with timestamps.

List all available transcript languages for a video from any supported platform.

Download a video from any supported platform (YouTube, Vimeo, etc.) to local storage. Returns the file path of the downloaded video.

List all downloaded video files in the storage directory or a specified directory.

Generate subtitles for a local video file using AI speech-to-text (OpenAI Whisper or local whisper). Creates an SRT or VTT file alongside the video.

Transcribes audio via Whisper. Preferred: audio_url (most token-efficient; server fetches bytes). audio_base64 is for small clips only (<= ~60KB raw per call). audio_path only works when the MCP host shares a filesystem with the caller (often false on Claude.ai / Claude Code). For larger payloads in sandboxed environments, use transcribe_upload_start / transcribe_upload_append / transcribe_upload_finalize. Server re-encodes to Opus 16kHz mono 16kbps before Whisper unless skip_compression=true. Long audio (>5min) or async=true returns a job_id; poll transcribe_get_job.

Begin a chunked audio upload for large payloads. Returns upload_id and max_chunk_bytes (~60KB).

Append one base64 chunk to an upload session.

Finalize a chunked upload, run compression + Whisper, return structured JSON (or text with as_text).

Poll an async transcription job created by transcribe-audio.

Cancel an async transcription job (best-effort).