Provided is a system and method for publishing a disparate live media output stream that complies with distribution format regulations. One or more processors in the system generate a preview based on a low-latency protocol for a plurality of live input streams, and generate an updated schedule based on one or more events identified in the preview in real-time. The updated schedule includes one or more transitions between the plurality of live input streams and pre-encoded media assets. A disparate live media output stream manifest is generated based on manipulation of manifests of the plurality of live input streams and pre-encoded media assets in accordance with the updated schedule. The generated disparate live media output stream manifest is delayed to allow decisions based on the preview, and includes programming content and non-programming content available to the one or more processors for immediate consumption, and complies with distribution format regulations.