Wait for video.asset.ready before handing a Mux playback ID to a player
Persist the asset id, playback id, status, and metadata at creation, and wait for video.asset.ready before playing. Asset ids and playback ids are not interchangeable.
Context: Official docs (Mux AI agents guide): when your agent creates an asset, persist the asset id, playback id, status, and metadata, then wait for the video.asset.ready event before playing anything. The asset id and the playback id are different things, mixing them up is the classic bug. Only hand the playback id to the player once the asset is ready.Maintainer review
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