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In Wireless Multimedia Sensor Networks (WMSNs), data fusion and collaborative in-network processing operations often require effective multimedia synchronization control. Extensive researches have been done in the traditional networks. Most of these works assume that there exists a powerful synchronization controller in the network. However, for WMSNs, the in-network processing of the multimedia content...
Many emerging multimedia applications enable independent groups (or clusters) of consumers to interact between them and share services within the context of simultaneous media content consumption. Owing to the semantic, spatial or temporal dependency among the involved media streams, concurrently synchronized playout points must be ensured so as not to spoil the user experience on such interaction...
This paper presents an enhanced version of a proposed extension of the RTP/RTCP standard protocols to acquire Inter-Destination Multimedia Synchronization (IDMS) in one-way distributed applications. Several dynamic policies for selecting the master reference play out point to synchronize are introduced and their suitability is analyzed, for specific network conditions and application requirements,...
Congestion control mechanisms include three phases: congestion detection, congestion notification and rate adjustment. So far diverse congestion detection methods for sensor networks are proposed. In this paper we introduce numerous congestion detection parameters and examine them in various respects; finally we choose one of them as the best parameter for video traffic in wireless sensor networks...
According to multimedia service distribution such as High-Definition Television (HDTV), Internet Protocol Television (IPTV) and Voice Over Internet Protocol (VoIP), the networks are required to guarantee Quality of Service (QoS) and real-time performance. Power Line Communication Technology is used for data transfer as well as the transfer of electric power. However, power line communication has some...
Distributed multimedia application over IP network is an evolving paradigm for the researcher in the field of Information and Communication Technology (ICT). There are several applications of this technology-video conferencing, tele-teaching, telemedicine and any collaborative application. Maintaining the satisfactory Quality Of Service [1,2] and synchronization is a big challenge to the researcher...
In this paper, we propose a tracker-based Peer to Peer (P2P) system for live multimedia streaming services. Our system is based on the Proactive network Provider Participation for P2P (P4P) framework which induces the cooperation between P2P systems and network service providers to achieve the best possible P2P application performance and efficient and fair usage of network resources. In the proposed...
In this paper, a novel OFDM symbol timing recovery method, which is robust to doubly selective fading channels and carrier frequency offset, is proposed for the mobile terminals of CMMB system. The time slot timing synchronization is accomplished by using the inverse sliding correlation between the segmenting Sync sequences, which possess the inverse conjugate symmetry (ICS) characteristic. Furthermore,...
In this paper, we investigate the influences of the difference in network latency among haptic media, sound and video on the quality of experience (QoE) for a haptic media, sound and video transfer system. In the case where network delay jitter exists, we subjectively assess the operability of haptic interface device, sound output quality, video output quality, inter-stream synchronization quality,...
Quality of Service (QoS) is an important, and admittedly overloaded, concept for emerging services based on the Real-Time Transport Protocol (RTP) to deliver multimedia content. In the context of the Internet Protocol Television (IPTV) services, the synchronization of multimedia components plays an important role. In order to synchronize audio and video components of multimedia content, RTP timestamps...
Quality of Service (QoS) is still one of the major challenges for emerging services based on the Real-Time Transport Protocol (RTP) to deliver multimedia content. In the context of the Internet Protocol Television (IPTV) services, the synchronization of multimedia components plays an important role. In order to synchronize audio and video components of multimedia content, RTP timestamps have to be...
This paper describes our study to develop a system to personalize broadcasting content using the Internet. In the system, the broadcaster provides additional content for personalization via the Internet, which is synchronized with the broadcasting program on air. The receiver combines both types of content to generate a personalized presentation. As a primary implementation, we developed a fundamental...
Technology of multimedia communications on network is rapidly developing today. SIP (Session Initiation Protocol), which plays an important role in 3G standards, is well applied in multimedia conferencing systems. Traditionally, most SIP-based conferencing systems have been limited in scalability due to their tightly coupled centralized structures. However, distributed conferencing based on SIP is...
After decades of wired communication, the wireless communication has replaced them in the recent past. Due to the large bandwidth of wireless communication, it is used for multimedia applications. The wireless multimedia network has gained tremendous importance in recent years due to its wide applications. It is unreliable because of network parameter constraints such as bandwidth, buffer, delay,...
We present vDelay, a tool for measuring the capture-to-display latency (CDL) and frame-rate of real-time video applications such as video chat and conferencing. vDelay allows measuring CDL and frame-rate without modifying the source code of these applications. Further, it does not require any specialized hardware. We have used vDelay to measure the CDL and frame-rate of popular video chat applications...
This paper proposes a media synchronization method for real-time group communication within a multiple device environment. The method controls the output time of each media unit received at multiple devices and synchronizes them, even if the arrival time of the media unit temporarily fluctuates. This fluctuation is caused by variation in bandwidth and the network delay between different access networks...
The media content provision in a variety of quality and price levels, through the concept of the perceived quality of service (PQoS) is considered as the most dominant among the various future visions of multimedia networking. The concept of the PQoS-driven service provision, based on multimedia content adaptation across heterogeneous networks, will become in the near future a key-issue among service...
In this paper we share our experience in building an ADSL video delivery test-bed. As a result, we are able to measure the impact of important parameters such as the loop length, the presence of background traffic and line protection against transmission errors on video quality. We show that although these access technologies promise a broadband pipe and low delay communication, a careful configuration...
For multi-object multimedia applications (MMAs), synchronization between the media objects is an inevitable problem. Current available literature focus on transmission synchronization and only two media objects are considered. Experiments show that synchronization performance is unacceptable in MMAs without presentation stage synchronization strategy even if local media objects are played. In MMAs,...
We introduce the three important aspects of the multimedia synchronization, including intra-medium synchronization, inter-medium synchronization and customer synchronization. At the same time, we discussed how to resolve them. Make good use of double buffer link list, we set buffer in the receive end before playback in order to achieve better playback quality. Through setting reference clock among...
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