A method of processing media content in Moving Picture Experts Group (MPEG) Network Based Media Processing (NBMP), includes obtaining multiple tasks for processing the media content, each of the multiple tasks having an envelope descriptor indicating, for a respective one among the multiple tasks, a message identifier (ID), a message priority and a sender ID of a sender, determining whether repeated tasks exist among the obtained multiple tasks, based on the message ID and the sender ID of each of the obtained multiple tasks, based on the repeated tasks being determined to exist, processing the media content, using one among the repeated tasks that has a highest priority among the message priority of each of the repeated tasks, and based on the repeated tasks being determined to not exist, processing the media content, using the obtained multiple tasks.
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