Collaborative streaming in heterogeneous and dynamic scenarios

Kahmann, Verena; Brandt, Jens; Wolf, Lars

doi:10.1145/1167838.1167864

Cited by 8 publications

(10 citation statements)

References 5 publications

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“…To address the heterogeneous capability of different handsets and preference of different users, the notion of "collaborative streaming" has been introduced [1], where heterogeneous devices may each receive the stream in the same playback time but in their own preferred resolution, bit-rate and language. Device discovery, session initialization, and session mobility are further discussed in [3].…”

Section: Related Workmentioning

confidence: 99%

“…For ease of discussion, we assume IVOs are overlaid on several bottom macroblock (MB) rows of a video. 1 The video content is encoded into two inde- 1 In general the region reserved for overlays could be anywhere and indeed could change over time. Clearly, our proposed technique will be more advantageous when the overlay region is relatively small, so that most content can be delivered under high latency conditions.…”

Section: B Coding For Separable Video Streams In Echomentioning

confidence: 99%

“…The goal of video conferencing is interpersonal communication, while streaming playback applications typically involve passive consumption of non-interactive video content. Individual viewing of video with no interpersonal interactivity is sometimes called individual streaming [1]. While communicating to associates and viewing video are distinct objectives, they are not mutually exclusive; in cases of live sporting or gaming events, one may prefer to watch the same streaming video with other viewers while communicating with them at the same time.…”

Section: Introductionmentioning

confidence: 99%

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Community Streaming With Interactive Visual Overlays: System and Optimization

Tan

Cheung

Ortega

et al. 2009

IEEE Trans. Multimedia

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Abstract-Community streaming is an enhanced form of joint content viewing where a sense of community is reinforced by the addition of interactive visual overlays, controlled in real-time by viewers, on top of a shared video stream. As a concrete example, we describe a community video system called ECHO, where personalized avatars are overlaid on top of a real-time encoded video stream of an Internet game for multicast consumption. Recognizing that only the visual overlays are generated live, we propose schemes that encode and schedule the live and non-live portions of the overlaid video separately in order to exploit the difference in delay sensitivity of the two, leading to video streams that contain two sub-streams with different delay constraints. We show that, in the known channel case, a low complexity "earliest deadline first" packet scheduling algorithm minimizes receiver buffer delay. We also analyze the case where multiple streams are multiplexed, which allows us to quantify the potential gains of allowing different delay constraints for different sub-streams. We show that a "water filling" strategy maximizes the total number of streams that can be supported. Simulation results show that the bandwidth necessary to maintain low-latency for visual overlays is reduced by about 40% when our proposed sub-stream approach is used. For multiplexing of multiple streams, our approach can increase the number of supported streams (e.g., a 30% increase when around ten streams are multiplexed).

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Section: Related Workmentioning

confidence: 99%

Section: B Coding For Separable Video Streams In Echomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Community Streaming With Interactive Visual Overlays: System and Optimization

Tan

Cheung

Ortega

et al. 2009

IEEE Trans. Multimedia

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“…This traditional usage model has become insufficient and limiting in a number of new contexts. 1,5 To address the heterogenous capability of different handsets and preference of different users, the notion of "collaborative streaming" has been introduced, 1 where a streaming session may involve several heterogenous devices, each receiving the stream in the same playback time but in their own preferred resolution, bit-rate and language. Device discovery, session initialization, and session mobility (including seamless transfer to different devices) are further discussed.…”

Section: Related Workmentioning

confidence: 99%

“…, F n , would have cumulative byte size of v[n] = v(nT ). After frame F 1 is produced at time T , the sender can send the minimum of unit capacity C * T and F 1 's frame size v [1]. If frame size v[1] is larger than unit capacity C * T , then the sender buffer contains l[1] = v[1] − C * T leftover bytes, which need to be sent in future transmission intervals.…”

Section: Streaming Non-separable Video Over Constant Bit-rate Channelmentioning

confidence: 99%

<title>ECHO: a community video streaming system with interactive visual overlays</title>

et al. 2008

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We describe a networked video application where personalized avatars, controlled by a group of "hecklers", are overlaid on top of a real-time encoded video stream of an Internet game for multicast consumption. Rather than passively observing the streamed content individually, the interactivity of the controllable avatars, along with heckling voice exchange, engenders a sense of community during group viewing. We first describe how the system splits video into independent regions with and without avatars for processing in order to minimize complexity. Observing that the region with avatars is more delay-sensitive due to their interactivity, we then show that the regions can be logically packetized into separable sub-streams, and be transported and buffered with different delay requirements, so that the interactivity of the avatars can be maximized. The utility of our system extends beyond Internet game watching to general community streaming of live or pre-encoded video with visual overlays.

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An open and scalable architecture for delivering 3D shared visualization services to heterogeneous devices

Paravati

Sanna

Lamberti

et al. 2011

Concurrency and Computation

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SUMMARYShared visualization environments represent an effective means to enhance collaborative work in engineering and scientific design tasks. The availability of high-speed networks allows researchers to work together from geographically distributed locations, and mobile devices are able to carry out ubiquitous 3D visualization tasks through wireless network connections. This paper presents a scalable architecture for the delivery of shared 3D visualization services to heterogeneous terminals ranging from powerful workstations to mobile devices such as PDAs and smart-phones. The framework design allows both desktop and mobile clients to simultaneously visualize the same model by sharing a common view. Remote-rendering servers support effective visualization on thin clients, and a load balancing mechanism provides efficient resource usage.

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Collaborative streaming in heterogeneous and dynamic scenarios

Abstract: This media streaming architecture solves the problems of collaborative session management, from session sharing to control of the common session state to session transfer among networked clients.

Cited by 8 publications

References 5 publications

Community Streaming With Interactive Visual Overlays: System and Optimization

Community Streaming With Interactive Visual Overlays: System and Optimization

<title>ECHO: a community video streaming system with interactive visual overlays</title>

An open and scalable architecture for delivering 3D shared visualization services to heterogeneous devices

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