한국방송∙미디어공학회:학술대회논문집 (Proceedings of the Korean Society of Broadcast Engineers Conference)
- 한국방송공학회 2009년도 IWAIT
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- Pages.49-54
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- 2009
A PRECISE AUDIO/VIDEO SYNCHRONIZATION SCHEME FOR MULTIMEDIA STREAMING
- Chi, Won-Sup (Computer and Telecommunications Engineering Div., Yonsei Univ.) ;
- Jung, Soon-Heung (Convergence Media Research Team, ETRI) ;
- Yoo, Jeong-Ju (Convergence Media Research Team, ETRI) ;
- Seo, Kwang-Deok (Computer and Telecommunications Engineering Div., Yonsei Univ.)
- 발행 : 2009.01.12
초록
Synchronization between media is an important aspect in the design of multimedia streaming system. This paper proposes a precise media synchronization mechanism for digital video and audio transport over IP networks. To support synchronization between video and audio bitstreams transported over IP networks, RTP/RTCP protocol suite is usually employed. To provide a precise mechanism for media synchronization between video and audio, we suggest an efficient media synchronization algorithm based on NPT (Normal Play Time) which can be derivable from the timestamp information in the header part of RTP packet generated for the transport of video and audio streams. With the proposed method, we do not need to send and process any RTCP SR (sender report) packet which is required for conventional media synchronization scheme, and accordingly could reduce the number of required UDP ports and the amount of control traffic injected into the network.