Extracting H5P interactive video captions

H5P InteractiveVideo embeds expose subtitle URLs through window.H5PIntegration.contents[cid].jsonContent — parse it as JSON, read params.interactiveVideo.video.textTracks.videoTrack[0].track.path, then resolve it with H5P.getPath(path, contentId) to get the public CDN URL (e.g., us-west-X.cdn.h5p.com/orgs/.../content/{id}/files/track-*.vtt). The CDN serves VTTs without auth, so curl works once you have the URL. Strip WEBVTT/timestamps/cue numbers to get a clean transcript.