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If you have videos hosted elsewhere (like s3) you can write a client that reads the videos and broadcasts them as a Participant (basically a bot that just plays the video)

ohh ok thankyou

you can actually use this new feature we've shipped for Ingress: https://docs.livekit.io/egress-ingress/ingress/overview/#url-input it allows you to "playback" any file hosted on a HTTP server to the livekit session