transcribe-media

namespace	aiwg
platforms	["all"]
name	Transcribe Media
description	Produce timestamped transcript sidecars for acquired audio/video with hashes, source metadata, speaker labels when available, and explicit degraded plans when STT tooling is missing
triggers	["transcribe video","transcribe audio","transcribe podcast","transcribe lecture","generate transcript sidecar","timestamped transcript for research","video audio research induction"]
category	media-curator

Transcribe Media

Create a research-grade transcript sidecar for a local acquired audio or video file. This primitive supports media-curator to research handoff. It does not claim transcription support unless an actual local STT tool, approved service adapter, human transcript, or diarization sidecar is available.

Inputs

Required:

• Local acquired media path.

Optional:

• Source URL, title, creator, acquired-at timestamp, acquisition ID, language.
• Existing transcript or diarization sidecar.

Output

Write transcript sidecars under .aiwg/media/transcripts/ or beside the acquired media when the collection already stores sidecars locally.

Recommended filename: <media-basename>.transcript.json

Required fields:

• schema: aiwg.media.transcript.v1
• source.path, source.url, source.sha256
• transcript.sha256, transcript.language, transcript.generated_at, transcript.tool, transcript.quality
• segments[] with stable id, start, end, text, and optional speaker
• provenance.wasDerivedFrom, provenance.generatedEntity, provenance.activity, provenance.used

Segment IDs MUST be stable. Use zero-padded sequential IDs such as seg-000001 unless the upstream transcript already has durable IDs.

Hashing

• source.sha256 is the SHA-256 of the exact local media file bytes.
• transcript.sha256 is the SHA-256 of the canonical transcript payload used for citation, not the pretty-printed JSON file.
• The canonical payload is the UTF-8 join of id, start, end, speaker if present, and text for every segment, separated by tabs and newlines.
• Use the same lowercase sha256:<hex> convention as media-curator integrity manifests.

Speaker Labels

Preserve speaker labels when STT output, a diarization sidecar, or a human transcript provides them. If no diarization is available, emit the documented single-speaker fallback SPEAKER_00 and record the limitation in transcript.quality.limitations.

Do not invent speaker names. Replace SPEAKER_00 with real names only when metadata or human verification proves them.

Tooling Detection

Check for an available transcription path before generating text:

command -v whisper-cpp || command -v whisper || command -v vosk-transcriber || true
command -v ffmpeg || true

If no STT tool or approved transcript source is available, do not fabricate transcript text. Write or report an actionable plan with:

• schema: aiwg.media.transcript-plan.v1
• status: blocked-tooling-missing
• source path and source hash when the media file can be read
• next steps for installing local STT tooling or providing a human transcript
• quality limits stating that no transcript hash exists until segment text exists

Verification Limits

A generated transcript is evidence of tool output, not proof of exact speech content. Handoff notes MUST state:

• Machine transcripts can contain word errors, omissions, and hallucinated punctuation.
• Speaker labels are provisional unless diarization or human review supports them.
• Research induction should cite the transcript hash and source media hash together.
• Human verification is required before using quotations in high-stakes or published claims.

Research Handoff

Include the transcript sidecar path, source media hash, transcript hash, source URL, acquisition metadata, quality status, and known limitations.

Fixture Example

See examples/sample.transcript.json for a minimal transcript sidecar with timestamps, speaker fallback, source URL, source hash, transcript hash, and provenance fields.

References

• @$AIWG_ROOT/agentic/code/frameworks/media-curator/skills/integrity-verification/SKILL.md — SHA-256 manifest and fixity conventions
• @$AIWG_ROOT/agentic/code/frameworks/media-curator/skills/provenance-tracking/SKILL.md — W3C PROV-O derivation model for media artifacts
• @$AIWG_ROOT/docs/integrations/media-curator-to-research-handoff.md — Research handoff expectations for media-derived artifacts