A unique identifier assigned to each API master job request. This parameter must be specified for the following actions: UpdateMedia, ProcessMedia, CancelMedia, GetMediaInfo, GetStatus.

A MediaID is not unique to a given source asset. A MediaID will contain a reference to at least one source asset, may contain desired transforms, formats, and destinations to be applied to that media. Most people use the API in a way that makes the MediaID the master record to associate with a single job request. That is, a MediaID references one or more sources, may reference a job that contains one or more tasks, and may define one or more destinations. The orchestrator will automatically parse the request into a job, assigning one or more tasks to be processed in an optimal fashion as subtasks of the job.