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let decodingInfo: ( WebAPI.MediaCapabilitiesAPI.mediaCapabilities, WebAPI.MediaCapabilitiesAPI.mediaDecodingConfiguration,) => Promise.t< WebAPI.MediaCapabilitiesAPI.mediaCapabilitiesDecodingInfo,>
let encodingInfo: ( WebAPI.MediaCapabilitiesAPI.mediaCapabilities, WebAPI.MediaCapabilitiesAPI.mediaEncodingConfiguration,) => Promise.t< WebAPI.MediaCapabilitiesAPI.mediaCapabilitiesEncodingInfo,>