• Title/Summary/Keyword: multimedia streaming

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A Router Buffer-based Congestion Control Scheme for Improving QoS of UHD Streaming Services (초고화질 스트리밍 서비스의 QoS를 향상시키기 위한 라우터 버퍼 기반의 혼잡 제어 기법)

  • Oh, Junyeol;Yun, Dooyeol;Chung, Kwangsue
    • Journal of KIISE
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    • v.41 no.11
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    • pp.974-981
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    • 2014
  • These days, use of multimedia streaming service and demand of QoS (Quality of Service) improvement have been increased because of development of network. QoS of streaming service is influenced by a jitter, delay, throughput, and loss rate. For guaranteeing these factors which are influencing QoS, the role of transport layer is very important. But existing TCP which is a typical transport layer protocol increases the size of congestion window slowly and decreases the size of a congestion window drastically. These TCP characteristic have a problem which cannot guarantee the QoS of UHD multimedia streaming service. In this paper, we propose a router buffer based congestion control method for improving the QoS of UHD streaming services. Our proposed scheme applies congestion window growth rate differentially according to a degree of congestion for preventing an excess of available bandwidth and maintaining a high bandwidth occupied. Also, our proposed scheme can control the size of congestion window according to a change of delay. After comparing with other congestion control protocols in the jitter, throughput, and loss rate, we found that our proposed scheme can offer a service which is suitable for the UDH streaming service.

Optimal Rate-Distortion base packet scheduling for multimedia streaming (멀티미디어 스트리밍을 위한 최소 왜곡 패킷 스케줄링 기법 연구)

  • Chang, In-Gwang;Won, You-Jip
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.295-297
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    • 2004
  • In this paper, we explore the streaming environment which adopts the MPEG-4 FGS(Fine Granualarity Scalability) encoding schemes. We investigate the server and client structure to fine the bottleneck of streaming system. After the structures, we propose a novel packet scheduling algorithm which enhances user perceptable playback quality. Experimental results show the performance enhancement of our algorithm, and system require less resources.

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Exploiting Packet Semantics in Real-time Multimedia Streaming

  • Hong, Sung-Woo;Won, You-Jip
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2009.01a
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    • pp.118-123
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    • 2009
  • In this paper, we propose packet selection and significance based interval allocation algorithm for real-time streaming service. In real-time streaming of inter-frame (and layer) coded video, minimizing packet loss does not imply maximizing QoS. It is true that packet loss adversely affects the QoS but one single packet can have more impact than several other packets. We exploit the fact that the significance of each packet loss is different from the frame type it belongs to and its position within GoP. Using packet dependency and PSNR degradation value imposed on the video from the corresponding packet loss, we find each packet's significance value. Based on the packet significance, the proposed algorithm determines which packets to send and when to send them. The proposed algorithm is tested using publicly available MPEG-4 video traces. Our scheduling algorithm brings significant improvement on user perceivable QoS. We foresee that the proposed algorithm manifests itself in last mile connection of the network where intervals between successive packets from the source and to the destination are well preserved.

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The implementation of RTSP System using MPEG-4 for Mobile Multimedia Streaming Service (모바일 멀티미디어 스트리밍 서비스를 위한 MPEG-4 기반의 RTSP 시스템 개발)

  • 이상은;전영균;박현우;윤태수
    • Proceedings of the Korea Multimedia Society Conference
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    • 2004.05a
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    • pp.314-317
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    • 2004
  • 본 논문에서는 모바일 디바이스에 실시간 영상을 스트리밍 서비스를 하기 위한MPEG-4 기반의 RTSP(Real Time Streaming Protocol) 시스템 구현 사례를 소개한다. 낮은 비트율을 요구하는 모바일디바이스에 실시간 멀티미디어 서비스를 하기 위해서는 영상은 작은 단위로 압축하는 기술, 이것을 실시간으로 전송할 수 있는 서버, 그리고 수신된 영상을 플레이 할 수 있는 클라이언트 기술이 필요하다. 본 논문에서는 가변적인 망에 영상을 적응적으로 전송하기 위한 압축 방식인 MPEG-4 FGS(Fine-Grained Scalable)와 실시간 전송을 위해 RTSP를 이용해서 서버와 WinCE 기반의 클라이언트를 개발하였다. 이러한 모바일 스트리밍 기술은 향후 화상 전화 및 홈 보안 서비스에 활용 될 것으로 예상한다.

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The method for protecting contents on a multimedia system (멀티미디어 시스템에서 콘텐츠를 보호하기 위한 방법)

  • Kim, Seong-Ki
    • Journal of the Korea Society of Computer and Information
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    • v.14 no.7
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    • pp.113-121
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    • 2009
  • As a DRM is recently being removed from many sites, the content protection on a video server becomes important. However, many protection methods have their own limitations, or aren't used due to the deterioration of the streaming performance. This paper proposes a content protection method that uses both the eCryptFS and the SELinux at the same time, and measures the performance of the proposed method by using various benchmarks. Then, this paper verifies that the method doesn't significantly decrease the streaming performance although the proposed method decreases the other performances, so it can be used for the content protection in a multimedia system.

A P2P Overlay System based on P4P-framework for Live Multimedia Streaming Services (라이브 멀티미디어 스트리밍 서비스를 위한 P4P 프레임워크 기반의 P2P 오버레이 시스템)

  • Byun, Hae-Sun;Lee, Mee-Jeong
    • The KIPS Transactions:PartC
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    • v.18C no.1
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    • pp.51-60
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    • 2011
  • In this paper, we propose a P4P based P2P system for live multimedia streaming services. In order to satisfy the strict requirement of delay in live multimedia streaming, in the proposed scheme, the P4P server of network provider provides the network status information related to delay and congestion links to P2P system in addition to the information to optimize the network resource utilization. The P2P system server, then, makes the peering suggestion based on the information from the network server. Also, we propose a playback synchronization mechanism that enable each peer to start the playback within the limited variation from the playback positions of source peer. Through the simulation results, it is shown that the proposed scheme not only deals with the original objective of the P4P framework, i.e., effective network utilization, but also the live multimedia streaming requirements. It enhances the playback continuity, and reduces the playback start-up latency and the control overhead. In addition, the proposed scheme reduces the variation in playback positions of the peers.

Development of Realtime Multimedia Streaming Service using Mobile Smart Devices (모바일 스마트 단말을 활용한 실시간 멀티미디어 스트리밍 서비스 개발)

  • Park, Mi-Ryong;Sim, Han-Eug
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.14 no.4
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    • pp.51-56
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    • 2014
  • Thesedays, there are many smart device applications developed, especially on the using various sensors included in the smart device. Smart devices have several sensors which are camera, GPS, mike, and communication module for collecting ubiquitous environment, and many applications are developed by using such sensors. In this paper, we developed the multimedia stream architecture and examined the smart device applications based on open source with front and back-end server clouds for developing the conceptual architecture. Also, we examined the back-end distributed servers, realtime multimedia stream transferring, multi-media store, and media relay for other server and smart devices. We test the examined architecture on the real target environment to collect the SIP initial setup time, media stream delay, and end-to-end play time. The test results show that there have good network operation environment to provide realtime multimedia services, and we need to improve the end-to-end play time by minimizing the initial setup time.

Adaptive Streaming System for Improving Energy Efficiency over IEEE 802.11e U-APSD (IEEE 802.11e U-APSD 환경에서 에너지 효율 향상을 위한 적응적인 스트리밍 시스템)

  • Lee, Sung-Hee;Chung, Kwang-Sue
    • Journal of KIISE:Computing Practices and Letters
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    • v.16 no.11
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    • pp.1066-1070
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    • 2010
  • In wireless network, energy efficiency is an important design consideration for continuous multimedia streaming service. This paper proposes a new streaming system, called BACASS (Buffer-Aware and Content-Aware Streaming System) that working on the 802.11e U-APSD (Unscheduled Automatic Power Save). The BACASS leads the DP (Doze Period) of U-APSD for improving energy efficiency by utilizing the PSNR based on content-aware and client buffer occupancy that is hinged on a network-aware streaming system using SVC. The simulation results demonstrate the effectiveness of the proposed streaming system.

A Delay-guaranteed Overlay Network for P2P Streaming Service (P2P 스트리밍 서비스를 위한 지연시간 보장 오버레이 네트워크)

  • Park, Seung-Chul
    • Journal of Information Technology Services
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    • v.9 no.3
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    • pp.83-93
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    • 2010
  • P2P streaming technology has advantages of scalability and availability comparing to the popular IP multicast. This paper proposes an approach to apply the P2P streaming technology to the delay-sensitive multimedia multicast applications. In order for the P2P streaming to be applied to the delay-sensitive applications, prior construction of delay-guaranteed overlay network is necessarily required. Moreover, the delay-guaranteed overlay network should be able to be kept even when the hand-overs occur owing to the departures of the intermediate P2P peers. This paper proposes a delay-guaranteed overlay network construction method by using the bandwidth and end-to-end delay based admission control and the backup peer based hand-over control mechanism.