M. F. Speer and S. McCanne, RTP Usage with Layered Multimedia Streams, Audio-Video Transport Working Group, Internet Eng. Task Force, Internet Draft, Mar. 1996 (work in progress).  Home/Search   Document Not in Database   Summary   Related Articles   Check

....is that the loss event rate of a HALM receiver should be calculated across all the received layers because these layers act as a single stream to compete for the bandwidth with TCP connections. Unfortunately, for multi layer transmission, each layer has it own RTP sequence number space [31], and we cannot distinguish the order of packets from different layers by using sequence numbers only. To do this, we must resort to some application level semantics, such as using timestamps in conjunction with sequence numbers to distinguish the order. Furthermore, when a receiver joins a new ....

M. Speer and S. McCanne, "RTP Usage with Layered Multimedia Streams," Internet Draft, draft-speer-avtlayered -video-02.txt, December 20th, 1996.

....are highly redundant since they are established between similar sources and receivers, for example the session description in formation for all layers is the same. An Internet draft addresses this issue by limiting the session description information and sending messages only for the base layer [16]. Active video solution. Active video can downscale itself at each node and therefore eliminates the need for establishing multiple multicast trees. In the case of active video, only one tree including all the subscribers is created. However, the subscription list will include information about ....

M. Speer and S. McCanne. RTP usage with layered multimedia streams. IETF Audio-Video Transport Working Group, Internet Draft, Dec 1996.

....clicking the topmost button. Two image qualities can be selected. The display size may be doubled by further interpolation of the decoded picture by choosing Large as display size. The control window further displays the current bit rate as well as the packet loss rate. We use the RTP protocol [13, 39] for session control and data transmission. For Ethernet transmission the packet size was chosen as 1024 bytes. The packet assembler tries to start each packet at a synchronization mark within the bit stream. This allows faster resynchronization at the receiver when packet loss occurs [40] ....

M. F. Speer and S. McCanne. RTP usage with layered multimedia streams. IETF Internet draft, Jun. 1996.

....that should be synchronized during playback. The default payload types are defined in RFC1890 [98] Specifications have been developed for encapsulating MPEG1 MPEG2 audio and video [63] JPEG video [13] Sun CellB video [106] H. 261 video streams [112] and, more generally, layered multimedia [107]. Two different levels of MPEG encapsulation have been developed. The lower level is suitable for implementation on existing IP connected workstations, and defines encapsulation of compressed audio and video data in the form of MPEG Elementary Streams . The more complete specification ....

M. Speer and S. McCanne. RTP usage with layered multimedia streams. IETF draft-speer-avt-layered-video-01.ps, 6/10/1996.

....the HP data with the corresponding real time stream, the initial value of the timestamp for the real time stream may be inserted at the beginning of the HP data. Alternatively, the HP data may be transmitted along with the A V data using layered multimedia transmission techniques for RTP [10]. This approach can be used with all of the payloads defined above. However, in practice, using it with the TS encapsulation system requires significant processing at both the transmitter (to extract the HP stream) and the receiver (to construct the transport stream from the HP data) ends. Instead ....

M. F. Speer, S. McCanne, "RTP Usage with Layered Multimedia Streams," Internet Draft, draftspeer -avt-layered-video-02, December 1996.

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M. F. Speer and S. McCanne, RTP Usage with Layered Multimedia Streams, Audio-Video Transport Working Group, Internet Eng. Task Force, Internet Draft, Mar. 1996 (work in progress).

....use of multiple IP multicast addresses in RLM requires that the layered bit stream be striped across distinct RTP sessions. An effort is currently underway based in part on the work presented in this paper to modify RTP to allow a single session to span multiple underlying network channels [12, 54]. Our proposed change is an extension to RTP that allows a participant to use one Source ID consistently across the logically distinct RTP sessions comprising the hierarchy. Accordingly, we run the Source ID allocation and collision detection algorithm only on the base layer, and likewise, ....

....distinct RTP sessions comprising the hierarchy. Accordingly, we run the Source ID allocation and collision detection algorithm only on the base layer, and likewise, transmit sender identification information only on 16 the base layer. This proposal is currently under review by the IETF 4 [54]. 4.2 The PVH Framing Protocol The flexibility of RTP s ALF based framework gives us the freedom to optimize the PVH framing protocol for robust interaction with the underlying network. We based our framing protocol in part on our work adapting H.261 for resilient packet transmission in vic. In ....

Michael F. Speer and Steven McCanne, RTP usage with Layered Multimedia Streams, Internet Engineering Task Force, Audio-Video Transport Working Group, Mar. 1996, Internet Draft (work in progress).

....by the Internet Engineering Task Force. Although RTP has proven to be a solid foundation for interoperable real time audio video applications, it was designed without any explicit notion of a layered signal representation. In joint work, we have extended RTP for layered stream delivery [31] and are currently implementing our proposed changes in vic. Since the RLM protocol processing is not in the fast path , run time performance is not critical. In fact, our prototype is implemented almost entirely in the interpreted language Tcl [27] Vic s C packet processing code performs ....

SPEER, M. F., AND MCCANNE, S. RTP usage with Layered Multimedia Streams. Internet Engineering Task Force, AudioVideo Transport Working Group, Mar. 1996. Internet Draft expires 9/1/96.

....multiple IP multicast addresses in RLM requires that the layered bit stream be striped across distinct RTP sessions. An effort is currently underway based in part on the work presented in this paper to modify RTP to allow a single session to span multiple underlying network channels [11] [47]. Our proposed change is an extension to RTP that allows a participant to use one Source ID consistently across the logically distinct RTP sessions comprising the hierarchy. Accordingly, we run the Source ID allocation and collision detection algorithm only on the base layer, and likewise, ....

....the logically distinct RTP sessions comprising the hierarchy. Accordingly, we run the Source ID allocation and collision detection algorithm only on the base layer, and likewise, transmit sender identification information only on the base layer. These changes are currently under review by the IETF [47]. B. The PVH Framing Protocol The flexibility of RTP s ALF based framework gives us the freedom to optimize the PVH framing protocol for robust interaction with the underlying network. We based our framing protocol in part on our work adapting H.261 for resilient packet transmission in vic. In ....

Michael F. Speer and Steven McCanne, RTP usage with Layered Multimedia Streams, Internet Engineering Task Force, Audio-Video Transport Working Group, Mar. 1996, Internet Draft expires 9/1/96.

No context found.

M. Speer and S. McCanne, RTP usage with layered multimedia streams, in Internet Draft, Dec., 20 1996.

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M. F. Speer, S. McCanne, "RTP Usage with Layered Multimedia Streams", Work in Progress.

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