Queues AI transcription of the spoken audio for a video post. Accepts a public post URL or an internal post id. Asynchronous: returns a job reference to poll with get_job_status; once complete the transcript is attached to get_post responses. Credits are charged on queueing and automatically refunded if the job fails. Image slideshows and photo posts have no audio and are rejected up front with no charge: use request_visual_analysis for their on-screen text instead.

Cost: 10 credits per call. Asynchronous: poll GET /api/v1/jobs/{jobRef}.