An interactive video-on-demand (VoD) system allows users to access video services, such as movies, electronic encyclopedia, interactive games, and educational videos from video servers on a broadband network. This paper develops a performance evaluation tool for the system design. In particular, a user activity model is developed to describe the usage of system resources, i.e., network bandwidt...

Handoff in a distributed IEEE 802.11 Wireless LAN network is a source of significant amount of problems on the video transmission environment. The visual quality of video streaming applications is lowered when stations are in handoff status. In this paper, we introduce an architecture of a session proxy (SP), which tries to preserve the quality of the streaming video upon each handoff between a...

In this contribution, we investigate the performance of the output buffer of a video streaming server. We assume that the server encodes the video stream in a scalable way, i.e. the generated video packets contain a base layer ensuring a minimum of guaranteed quality and a stack of additional enhancement layers progressively improving the quality of video. When the output buffer gets congested,...

In streaming video applications, video sequences are encoded off-line and stored in a server. Users may access the server over a constant bitrate channel. Examples of the streaming video applications are video-on-demand, archived video news, and noninteractive distance learning. Before the playback, part of the video bitstream is pre-loaded in the decoder buffer to ensure that every frame can b...

Most of the traditional video conferencing are standard SIP or H.323 architecture. There will be a single point of performance bottlenecks if large-scale video conference or a larger number of conferences emerge at the same time. In this paper, we proposed a new architecture of Multipoint Video Conference which can support a lot of meetings simultaneously using P2P and application multicast tec...

In this paper, we consider the placement of scalable video data on single and multiple disks for storage and realtime retrieval. For the single-disk case, we extend the principle of constant frame grouping from constant bit rate (CBR) to variable bit rate (VBR) scalable video data. When the number of admitted users exceeds the server capacity, the rate of data sent to each user is reduced to re...

We present a Web-based video annotation system named iVAS (intelligent Video Annotation Server) that allows users to associate Internet video content with annotations. The system analyzes video content to acquire cut/shot information and color histograms. Then it automatically generates a Web document that allows the users to edit the annotations. We also present two application systems based o...

Despite the amelioration in communication technologies, the server network I/O bottleneck remains a severe obstacle in video-on-demand applications. All bandwidth-sharing techniques, proposed to overcome this, assume videos to be requested in their entirety. In this paper, we extend the video-on-demand delivery problem so that it allows users to request parts of video and be able to receive the...

Based on the newly developed DaVinci technology, a designing scheme of embedded web video monitoring system is proposed. The scheme combines high-speed and dual-core signal processor (TMS320DM6467) with embedded Linux operating system as the platform to complete the H.264 encoding, transmission and storage of video signal. Building the embedded Web server, user can login into the server and mon...

Video streaming is becoming more mainstream as the availability of Internet and bandwidth is increasing. At the same time, the surge in computational power in laptops and stationary computers for home use has caused persistent 3D online worlds to gain momentum, and these worlds are now big contenders in the entertainment industry. Recently, we have also seen the start of a synergy of online vir...