A Sender MAY, unless constrained by IS-11, produce any H.264 coded stream that is compliant with the `profile` and `level` of the associated Flow. Such a Sender MAY use one or multiple active parameter sets as per the [H.264][] specification. A Sender MAY seamlessly change dynamically the coded stream's active parameter sets, provided that the Flow associated with the Sender changes accordingly and the content of the SDP transport file does not change. If the content of the SDP transport file changes, the Sender MUST comply with IS-04, IS-05. A Sender indicates its mode of operation with the `parameter_sets_flow_mode` and `parameter_sets_transport_mode` attributes.
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