Mux launches dashboard playground for testing video workflows

Mux has launched a playground in its dashboard for trying Mux Robots workflows on video assets. Builders can view results before writing code, with workflow settings and formatted outputs in one place. Robots can summarize an asset, identify key moments, translate captions or moderate content. Mux says these tasks can each be started with a single API call.

Builders choose an asset, select a workflow and adjust its parameters and output steering. They can select a recent asset from a dropdown or enter an asset ID. Runs use the Robots API, not a simulation, and their results appear in the jobs list for 30 days. The playground presents outputs as structured context rather than only raw JSON. Key Moments results appear as cards with transcript cues and, when requested, a strip of thumbnails.

Builders can use the Instant clips option on a key moment to create a clipped asset or a copyable instant clip. They can trim the selected range and receive a playback ID. A transcript appears beside the player and follows the video during playback. If Generate Premium Captions labels a speaker incorrectly, the label can be corrected there, and the revised track replaces the earlier one on the asset. Builders can run a workflow again with different settings and compare two jobs, including the parameters and output steering used for each. The side-by-side view helps builders see how their changes affected results instead of relying on memory.

For example, Mux says a Find Key Moments job using the selection_strategy value product_moments can return different results from one using story_beats. Once a result is satisfactory, a workflow card's Copy agent prompt option provides instructions for a coding agent. The prompt includes the endpoint, parameters and steering, webhook details, and a note about handling the output. Builders can use that prompt as a specification when moving the tuned setup into an application. They can open the playground in the Mux Dashboard under Robots → Playground and select a library asset or paste an asset ID. Jobs use the same units as API-created jobs, and the page tracks session consumption in units and dollars.