A device for processing video data includes a memory, a receiver configured to real-time transport protocol (RTP) packets, and one or more processors configured to receive a first aggregation packet according to a real-time transfer protocol (RTP), wherein the first aggregation packet comprises a payload header and one or more aggregation units; parse a first aggregation unit that is the first aggregation unit of the first aggregation packet to determine a value for a first parameter, wherein the first parameter specifies a decoding order number for a NAL unit included in the first aggregation packet; parse a second aggregation unit to determine a value for a second parameter, wherein the second aggregation unit follows the first aggregation unit in the first aggregation packet; and, based on the first parameter and the second parameter, determine a decoding order for a NAL unit included in the second aggregation unit.