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Multi-party video conferencing (MPVC) is the next big opportunity for Internet streaming. Commercial MPVC solutions are either server-based or peer-to-peer (P2P)-based, which both have performance limitations. P2P technology is expected to dominate the MPVC platform. There are four requirements for a robust MPVC system: 1) realistic network assumptions; 2) realistic system settings; 3) multi-rate...
In its Release 6, the Third Generation Partnership Project (3GPP) is defining a new service known as Multimedia Broadcast/Multicast (MBMS) that enables a number of new applications. Due to its nature, no feedback link from the receiver to the sender exists in MBMS. Hence no retransmission techniques can be employed to cope with the underlying erroneous wireless channel. Instead, 3GPP is adopting a...
Free-viewpoint video conferencing allows a participant to observe the remote 3D scene from any freely chosen viewpoint. An intermediate virtual viewpoint image is typically synthesized using two pairs of transmitted texture and depth maps from two neighboring captured viewpoints via depth-image-based rendering (DIBR). To maintain high quality of synthesized images, it is imperative to contain the...
Irrecoverable data loss may be unavoidable for real-time video communication over common best-effort networks. Rather than always display impaired pictures or always “freeze” the last good picture, it is preferable to transmit additional hints to support selective freezing of heavily damaged pictures only. In particular, errors in impaired pictures tend to be localized, and often manifest themselves...
Digital video resizing is paramount for promising wireless video applications because different kinds of mobile terminal devices may have different screen sizes. However, it is difficult to efficiently reuse the motion vectors and macroblock modes for the traditional transcoding schemes of spatial resolution reducing because of the different resolutions between the decoder and the encoder. This paper...
High-quality and low-latency video streaming is essential to providing a natural user experience in video conferencing. This is challenging over lossy networks since compressed video is highly fragile while the low-latency requirement limits the effectiveness of traditional error control approaches such as retransmission and forward error correction. In this paper, we advocate a practical solution...
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