An emerging requirement in multimedia applications over the Internet is the provisioning\nof synchronized play out of multimedia streams on all the ultimate receivers. Most multimedia\napplications use real-time transport protocol/real-time control protocol (RTP/RTCP) to transport\nmultimedia data over the internet. Internet Protocol (IP) network incurs a loss and/or delay of\nmedia packets resulting in distortions at receivers that can be perceived by the user. These distortions\nneed to be removed before data is presented to the end user. To handle such issues inter-stream\nand intra-stream synchronization algorithms were developed by the researcher using RTP/RTCP\nprotocols. These schemes could not work under multicasting environment properly. In this paper,\nwe have presented an algorithm based on RTP/RTCP protocol that achieved synchronized playout\nof multimedia data under multicasting environment. The proposed scheme offers a modification in\nRTCP and usage of the Network Time Protocol (NTP) as a source of the common clock to achieve\nsynchronized playout of multimedia data on multiple devices at the same time. We have implemented\nand tested our algorithm in Ericson Research Corporate Unit, Lulea, Sweden. Implementation results\nshow that the proposed algorithm delivered accurately synchronized playout of multimedia data\nunder all the possible scenarios defined in the experimental setup
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