The Experts below are selected from a list of 65277 Experts worldwide ranked by ideXlab platform
Hideaki Nagatuma - One of the best experts on this subject based on the ideXlab platform.
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Development of an Emergency Medical Video Multiplexing transport System (EMTS): Aiming at the Nation-Wide Prehospital Care in Ambulance
Journal of Medical Systems, 2003Co-Authors: Hideaki NagatumaAbstract:The Emergency Medical Video Multiplexing transport System (EMTS) is designed to support prehospital care by delivering high quality patient's live video streams in an ambulance to emergency doctors in a remote hospital on the basis of satellite communications. The feature is that EMTS divides a patient's live video scene into four pieces and transports the four video streams on four separate network channels. By multiplexing the four video streams, EMTS is able to transport high quality videos through low data transmission rate networks such as satellite communications and cellular phone networks. In order to transport live video streams constantly, EMTS adopts real-time transport Protocol/real-time Control Protocol as a network protocol, and video stream data are compressed by Moving Picture Experts Group 4 format. As EMTS combines four video streams with checking video frame numbers, it uses a refresh packet that initializes server's frame numbers to synchronize the four video streams.
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Development of an Emergency Medical Video Multiplexing transport System: Aiming at the Nation Wide Prehospital Care on Ambulance
Journal of Medical Systems, 2003Co-Authors: Hideaki NagatumaAbstract:The Emergency Medical Video Multiplexing transport System (EMTS) is designed to support prehospital cares by delivering high quality live video streams of patients in an ambulance to emergency doctors in a remote hospital via satellite communications. The important feature is that EMTS divides a patient's live video scene into four pieces and transports the four video streams on four separate network channels. By multiplexing four video streams, EMTS is able to transport high quality videos through low data transmission rate networks such as satellite communications and cellular phone networks. In order to transport live video streams constantly, EMTS adopts real-time transport Protocol/real-time Control Protocol as a network protocol and video stream data are compressed by Moving Picture Experts Group 4 format. As EMTS combines four video streams with checking video frame numbers, it uses a refresh packet that initializes server's frame numbers to synchronize the four video streams.
Stephan Wenger - One of the best experts on this subject based on the ideXlab platform.
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system layer integration of high efficiency video coding
IEEE Transactions on Circuits and Systems for Video Technology, 2012Co-Authors: Thomas Schierl, Ye-kui Wang, Miska Hannuksela, Stephan WengerAbstract:This paper describes the integration of High Efficiency Video Coding (HEVC) into end-to-end multimedia systems, formats, and protocols such as real-time transport Protocol, the transport stream of the MPEG-2 standard suite, and dynamic adaptive streaming over the Hypertext transport Protocol. This paper gives a brief overview of the high-level syntax of HEVC and the relation to the Advanced Video Coding standard (H.264/AVC). A section on HEVC error resilience concludes the HEVC overview. Furthermore, this paper describes applications of video transport and delivery such as broadcast, television over the Internet Protocol, Internet streaming, video conversation, and storage as provided by the different system layers.
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transport and signaling of svc in ip networks
IEEE Transactions on Circuits and Systems for Video Technology, 2007Co-Authors: Stephan Wenger, Ye-kui Wang, Thomas SchierlAbstract:The transport of scalable media, and in particular of scalable video conforming to the forthcoming Scalable Video Coding (SVC) technology, presents challenges not only in the video compression technology, but also in transport and signaling. This paper discusses the current status of standardization of the support for scalable media, and SVC in particular, over IP based networks. Both the transport of SVC over the real-time transport Protocol (RTP), and the signaling support-namely the additional mechanisms in the Session Description Protocol (SDP)-are covered. As it turns out, the support of SVC over RTP is not quite as straightforward as that of nonscalable video bit streams. Specifically, the signaling architecture requires an almost complete overhaul, and new protocol mechanisms need to be introduced into the packetization.
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h 264 avc over ip
IEEE Transactions on Circuits and Systems for Video Technology, 2003Co-Authors: Stephan WengerAbstract:H.264 is the ITU-T's new, nonbackward compatible video compression Recommendation that significantly outperforms all previous video compression standards. It consists of a video coding layer (VCL) which performs all the classic signal processing tasks and generates bit strings containing coded macroblocks, and a network adaptation layer (NAL) which adapts those bit strings in a network friendly way. The paper describes the use of H.264 coded video over best-effort IP networks, using RTP as the real-time transport protocol. After a description of the environment, the error-resilience tools of H.264 and the draft specification of the RTP payload format are introduced. Next the performance of several possible VCL- and NAL-based error-resilience tools of H.264 are verified in simulations.
Thomas Schierl - One of the best experts on this subject based on the ideXlab platform.
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system layer integration of high efficiency video coding
IEEE Transactions on Circuits and Systems for Video Technology, 2012Co-Authors: Thomas Schierl, Ye-kui Wang, Miska Hannuksela, Stephan WengerAbstract:This paper describes the integration of High Efficiency Video Coding (HEVC) into end-to-end multimedia systems, formats, and protocols such as real-time transport Protocol, the transport stream of the MPEG-2 standard suite, and dynamic adaptive streaming over the Hypertext transport Protocol. This paper gives a brief overview of the high-level syntax of HEVC and the relation to the Advanced Video Coding standard (H.264/AVC). A section on HEVC error resilience concludes the HEVC overview. Furthermore, this paper describes applications of video transport and delivery such as broadcast, television over the Internet Protocol, Internet streaming, video conversation, and storage as provided by the different system layers.
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Source-Specific Media Attributes in the Session Description Protocol (SDP)
2009Co-Authors: Joerg Ott, Thomas Schierl, Jonathan LennoxAbstract:The Session Description Protocol provides mechanisms to describe attributes of multimedia sessions and of individual media streams (e.g., real-time transport Protocol (RTP) sessions) within a multimedia session, but does not provide any mechanism to describe individual media sources within a media stream. This document defines a mechanism to describe RTP media sources, identified by their Synchronization Source Identifiers (SSRCs), in SDP, associate attributes with these sources, and express relationships among sources. It also defines several source-level attributes which can be used to describe properties of media sources.
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transport and signaling of svc in ip networks
IEEE Transactions on Circuits and Systems for Video Technology, 2007Co-Authors: Stephan Wenger, Ye-kui Wang, Thomas SchierlAbstract:The transport of scalable media, and in particular of scalable video conforming to the forthcoming Scalable Video Coding (SVC) technology, presents challenges not only in the video compression technology, but also in transport and signaling. This paper discusses the current status of standardization of the support for scalable media, and SVC in particular, over IP based networks. Both the transport of SVC over the real-time transport Protocol (RTP), and the signaling support-namely the additional mechanisms in the Session Description Protocol (SDP)-are covered. As it turns out, the support of SVC over RTP is not quite as straightforward as that of nonscalable video bit streams. Specifically, the signaling architecture requires an almost complete overhaul, and new protocol mechanisms need to be introduced into the packetization.
Ye-kui Wang - One of the best experts on this subject based on the ideXlab platform.
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system layer integration of high efficiency video coding
IEEE Transactions on Circuits and Systems for Video Technology, 2012Co-Authors: Thomas Schierl, Ye-kui Wang, Miska Hannuksela, Stephan WengerAbstract:This paper describes the integration of High Efficiency Video Coding (HEVC) into end-to-end multimedia systems, formats, and protocols such as real-time transport Protocol, the transport stream of the MPEG-2 standard suite, and dynamic adaptive streaming over the Hypertext transport Protocol. This paper gives a brief overview of the high-level syntax of HEVC and the relation to the Advanced Video Coding standard (H.264/AVC). A section on HEVC error resilience concludes the HEVC overview. Furthermore, this paper describes applications of video transport and delivery such as broadcast, television over the Internet Protocol, Internet streaming, video conversation, and storage as provided by the different system layers.
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RTP/AVPF compliant feedback for error resilient video coding in conversational applications
2009 9th International Symposium on Communications and Information Technology, 2009Co-Authors: Ye-kui Wang, Mate Sujeet, Miska Hannuksela, Ying Chen, Moncef GabboujAbstract:Feedback-based error-resilient video coding relies on efficient transmission of feedback messages. The Audio-Visual Profile with Feedback (AVPF) for real-time transport Control Protocol (RTCP), i.e. RTP/AVPF, supports low-latency feedbacks. In this paper, a reference picture selection (RPS) method using RTP/AVPF-compliant feedback is proposed. A restriction period is first derived in the codec layer based on the previously transmitted back-channel message, the RTCP reporting interval, the round-trip time, and the processing delay of the encoder. Then, a feedback message is transmitted when the restriction period is passed and an incorrectly reconstructed picture is detected. At the encoder, the decoded picture buffer (DPB) is adaptively controlled to combat feedback delay fluctuation in RTP/AVPF. Simulation results show that the proposed entire solution outperforms traditional RPS, wherein a back-channel message is transmitted for every lost picture and the DPB is managed by sliding window.
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transport and signaling of svc in ip networks
IEEE Transactions on Circuits and Systems for Video Technology, 2007Co-Authors: Stephan Wenger, Ye-kui Wang, Thomas SchierlAbstract:The transport of scalable media, and in particular of scalable video conforming to the forthcoming Scalable Video Coding (SVC) technology, presents challenges not only in the video compression technology, but also in transport and signaling. This paper discusses the current status of standardization of the support for scalable media, and SVC in particular, over IP based networks. Both the transport of SVC over the real-time transport Protocol (RTP), and the signaling support-namely the additional mechanisms in the Session Description Protocol (SDP)-are covered. As it turns out, the support of SVC over RTP is not quite as straightforward as that of nonscalable video bit streams. Specifically, the signaling architecture requires an almost complete overhaul, and new protocol mechanisms need to be introduced into the packetization.
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AVS-M: From Standards to Applications
Journal of Computer Science and Technology, 2006Co-Authors: Ye-kui WangAbstract:AVS stands for the Audio Video coding Standard Workgroup of China, who develops audio/video coding standards as well as system and digital right management standards. AVS-M is the AVS video coding standard targeting for mobile multimedia applications. Besides the coding specification, AVS also developed the file format and real-time transport Protocol (RTP) payload format specifications to enable the application of AVS-M video in various services. This paper reviews the high-level coding tools and features of the AVS-M coding standard as well as the file format and payload format standards. In particular, sixteen AVS-M high-level coding tools and features, which cover most of the high-level topics during AVS-M standardization, are discussed in some detail. After that, the error resilience tools are briefly reviewed before the file format and RTP payload format discussions. The coding efficiency and error resiliency performances of AVS-M are provided finally. H.264/AVC has been extensively used as a comparison in many of the discussions and the simulation results.
Eric Rescorla - One of the best experts on this subject based on the ideXlab platform.
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datagram transport layer security dtls extension to establish keys for the secure real time transport protocol srtp
RFC, 2010Co-Authors: David A Mcgrew, Eric RescorlaAbstract:This document describes a Datagram transport Layer Security (DTLS) extension to establish keys for Secure RTP (SRTP) and Secure RTP Control Protocol (SRTCP) flows. DTLS keying happens on the media path, independent of any out-of-band signalling channel present. [STANDARDS- TRACK]
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Framework for Establishing a Secure real-time transport Protocol (SRTP) Security Context Using Datagram transport Layer Security (DTLS)
RFC, 2010Co-Authors: Joseph Fischl, H. (arm Limited) Tschofenig, Eric RescorlaAbstract:This document specifies how to use the Session Initiation Protocol (SIP) to establish a Secure real-time transport Protocol (SRTP) security context using the Datagram transport Layer Security (DTLS) protocol. It describes a mechanism of transporting a fingerprint attribute in the Session Description Protocol (SDP) that identifies the key that will be presented during the DTLS handshake. The key exchange travels along the media path as opposed to the signaling path. The SIP Identity mechanism can be used to protect the integrity of the fingerprint attribute from modification by intermediate proxies. [STANDARDS-TRACK]
