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Dynamic adaptive streaming over HTTP (DASH) has seen a rapid increase in recent years. While opening a door for ensuring smooth video playback with bitrate adaptation, especially for unstable networks, DASH also requires a set of new streaming strategies (e.g., bitrate adaptation). A key of designing these strategies is to understand the viewing engagement patterns in DASH, which are the correlation...
Streaming multimedia over the Internet is omnipresent but still in its infancy, specifically when it comes to the adaptation based on bandwidth/throughput measurements, clients competing for limited/shared bandwidth, and the presence of a caching infrastructure. In this paper we present a buffer-based adaptation logic in combination with a toolset of client metrics to compensate for erroneous adaptation...
In response to the rapid growth of mobile video traffic, major video providers such as YouTube and Netflix have recently adopted HTTP adaptive streaming protocol for video delivery. However, the possible degradation and instability in the perceived video quality are still the major issues with this protocol. Moreover, this protocol can cause unfairness among competing players in addition to bandwidth...
With advanced modulation, 100-Gb/s systems over 100s of kilometers based on directly-modulated single-model VCSELs are achieved using coherent detection, and an 115-Gb/s line-rate short-reach system based on a single VCSEL is demonstrated using direct detection.
Interactive multiview video streaming (IMVS) allows viewers to periodically switch viewpoint. Its user experience can be further enhanced by creating virtual views from neighboring coded views using view synthesis techniques. Dynamic adaptive streaming over HTTP (DASH) is a new standard that can adjust the quality of video streaming according to the network condition. In this paper, we propose an...
The huge diffusion of mobile devices is rapidly changing the way multimedia content is consumed. Mobile devices are often used as a second screen, providing complementary information on the content shown on the primary screen, as different camera angles in case of a sport event. The introduction of multiple camera angles poses many challenges with respect to guaranteeing a high Quality of Experience...
HTTP Adaptive Streaming (HAS) is becoming the de-facto standard for Over-The-Top video streaming. A HAS video consists of multiple segments, encoded at multiple quality levels. Allowing the client to select the quality level for every segment, a smoother playback and a higher Quality of Experience (QoE) can be perceived. Although results are promising, current quality selection heuristics are generally...
In this paper we analyze the impact of different game types and video adaptation strategies on Quality of Experience (QoE) in cloud gaming. We focus on image quality and frame rate as parameters to be manipulated in the video encoder in different ways in order to meet bandwidth constraints of the network link. Our hypothesis is that under certain bandwidth conditions, maximization of the QoE for players...
The aim of our work is to develop an application that runs on a mobile platform, and performs live streaming from the camera of a phone to other phones and PCs. The application should be able to adapt the quality of the video according to external factors like the strength of the network connection.
Bit allocation is necessary for Scalable High Efficiency Video Coding (SHVC) rate control to provide optimal Rate-Distortion (R-D) performance under the bandwidth constraint. Since λ is the key factor to determine the bitrate and corresponding distortion, we seek to design a λ-domain optimal bit allocation algorithm for SHVC by taking the combined inter-layer and intra-layer dependency into consideration...
Recent studies observe that competing adaptive video streaming applications generate flows that lead to instability, under-utilization, and unfairness in bottleneck link sharing within the network. Additional measurements suggest there may also be a negative impact on users' perceived quality of service as a consequence. While it may be intuitive to resolve application-generated issues at the application...
Live streaming of large-scale events such as the Olympic Games with a huge number of viewers is challenging, as the streaming infrastructure needs to scale fast and big, and often in an unpredictable manner. Peer-to-peer (P2P) live streaming (Peercasting) has proven to be beneficial in these scenarios, as resources are scaling inherently with the number of nodes. However, churn behavior in a node's...
This paper adresses the problem of resource allocation for video streaming applications in a cellular wireless network. We propose a solution based on Regions Of Interest (ROI) partitioning to hierarchically transmit packets in order to keep an acceptable experienced QoS in the case of degraded conditions. The proposed resource allocation strategy in terms of scheduling policy is between best-effort...
This paper describes the resource management of a DVB-RCS geostationary satellite network. The functional modules of the access layer aim at efficiently exploiting the link resources while assuring the contracted Quality of Service (QoS) to the traffic entering the satellite network. The main novelty is the integration between the Connection Admission Control and the Congestion Control procedures...
Video streaming constitutes the vast majority of Internet traffic and the DASH protocol has become the de-facto standard in the industry of multimedia delivery. The multicast method for information distribution has the potential to dramatically reduce multimedia streaming traffic; however, to date, there is no effective Adaptive Logic (AL) designed to support multicast constraints at the client side...
This paper describes the time-domain bandwidth extension (TBE) framework employed to code wideband and super-wideband speech in the newly standardized 3GPP EVS codec. The TBE algorithm uses a nonlinear harmonic modeling technique that incorporates principles of time-domain envelope-modulated noise mixing. At 13.2 kbps, the super-wideband coding of speech uses as low as 1.55 kbps for encoding the spectral...
Existing techniques usually adopt compact descriptors such as Fisher vector for mobile visual search, since compact descriptors are memory-efficient and suitable for fast transmission. In common Fisher vector methods, in order to make the size of image representations small enough for efficient transmission, only a small number of visual words are used. However, this choice usually sacrifices the...
For multimedia streaming in mobile environments, video bitrate should be carefully determined and different channel quality and pricing in heterogeneous wireless networks (e.g., cellular and WiFi networks) need to be considered. In this work, we propose a new bitrate adaptation (BA) technique called mobility-aware dynamic adaptive streaming over HTTP (MDASH), in which a cellular data usage is minimized...
HTTP streaming currently dominates Internet traffic. It is increasingly common that video players employ adaptive bitrate (ABR) streaming strategies to maximise the user experience by selecting the highest video representation while targeting stall-free playback. Our interest lies in the common situation where a set of video flows are competing for access to a shared bottleneck link, such as in a...
This work presents an adaptive control approach for queue-based Bandwidth-on-Demand (BoD) procedures in geostationary satellite networks. In queue-based protocols, the controller objective is to drive the buffer queue length to a certain target queue length. The proposed protocol is based on the construction of a certain number of models (MRs) that represents a particular statistical network behavior...
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