• Title/Summary/Keyword: multimedia streaming

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Design and Implementation of Efficient DRM System for Contents Streaming based on H.264 (H.264 콘텐츠 스트리밍을 위한 효율적인 DRM 시스템의 설계 및 구현)

  • Jung, Yoon-Hyun;Oh, Soo-Hyun
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.19 no.2
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    • pp.155-163
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    • 2009
  • DRM system with streaming scheme has obtained it's priority due to generalized production and distribution of digital contents by development of multimedia device and internet. Previous DRM system with streaming scheme over-burdened the system by encrypting every data of the contents. This paper presents DRM system with new streaming scheme that is able to independently transmit encrypted contents to network protocol and maximize system function by encrypting only certain parts of data. Also, performance is analyzed through designing and implementing the proposed system.

A Semantic-based Post-office Box Structure for User-centered Multimedia Services (사용자 위주의 멀티미디어 서비스를 위한 시멘틱 기반의 사서함 구조)

  • Lee Chong-Deuk;Ahn Jeong-Yong
    • Journal of the Korean Institute of Intelligent Systems
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    • v.16 no.4
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    • pp.402-409
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    • 2006
  • In recent years, several methods in distributed environment have been proposed in which a user-centered multimedia service may be efficiently provided. However, problems such as the improvement of QoS, streaming and the dynamic service of data for distributed service of multimedia data are introduced. In this paper we propose POXHr structure for user-centered multimedia service in distributed network environment. The proposed POXHr structure are constructed by disjunct, conjunct, semantic and filtering mapping scheme, and its structure are updated by Mfiltering scheme. The comparison results shows that the proposed method provides the better than the other methods.

A Synchronization Scheme for Hierarchical Video Streams over Heterogeneous Networks

  • Sohn, Yejin;Cho, Minju;Seo, Minjae;Paik, Jongho
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.8
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    • pp.3121-3135
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    • 2015
  • Owing to the increase in consumption of multimedia content and the improvement of device capacity, user demand for high-quality content has increased. However, it is difficult to transport such large amounts of content over the existing broadcasting network with limited bandwidth. To provide high-definition broadcasting, some studies suggest methods of transporting multimedia over heterogeneous networks after encoding content hierarchically. MPEG Media Transport (MMT), standardized by Moving Picture Experts Group (MPEG), is a solution that enables large-volume media transport over heterogeneous networks such as digital broadcasting networks and packet-switched networks. In the case of delivering a scalable encoded video over different networks, synchronization of each stream is an important issue. MMT defines a synchronization scheme, but does not contain sufficient functions to implement it. In this paper, we propose a synchronization scheme for media streams that are encoded hierarchically, divided into layers, and transported over heterogeneous networks. We implement our scheme using MMT and HTTP, and experimented using three encapsulated video streams with different durations. As a result, we show that the proposed scheme can reduce the waiting time to display high-quality video, relative to Dynamic Adaptive Streaming over HTTP-Scalable Video Coding (DASH-SVC) by requesting segments of enhanced layers after calculating the transmission time. Additionally, we find out that the selection of durations have a relation to the characteristics of the video.

SMIL Extensions for Representation and Streaming of Lecture Contents (원격강의 컨텐츠의 표현과 스트리밍을 위한 SMIL 확장에 대한 연구)

  • 최용준;정상준;권은영;구자효;김종근
    • Journal of Korea Multimedia Society
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    • v.6 no.3
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    • pp.527-538
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    • 2003
  • The contents of remote lectures are written by authoring tools or animation tools. Written contents then integrate existing medias, and are stored in a file type, which is added to the lecturing activities of lecturers. These files are stored according to the kinds of each authoring tool. So, there is no interchangeability and the efficiency of each media is not so good. Due to these structural features, it is not possible to do streaming lectures in on-line environments. In this study, a technique was suggested, which guarantees the interchangeability of remote lecturing contents using SMIL which is a synchronizing multimedia language. The suggested technique is an extended type of SMIL, and includes tags to represent the lectures of tutors which are the specific feature of remote lectures. Additionally, a model, which does streaming SMIL remote lecture contents through on-line, and which transfers control techniques are suggested. The remote lecture contents established by the proposed method can be applied to all authoring tools for remote lectures just by installing conversion modules, and can be a kind of expression model of the synchronizing model for streaming service in on-line environment.

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Real-Time Streaming Traffic Prediction Using Deep Learning Models Based on Recurrent Neural Network (순환 신경망 기반 딥러닝 모델들을 활용한 실시간 스트리밍 트래픽 예측)

  • Jinho, Kim;Donghyeok, An
    • KIPS Transactions on Computer and Communication Systems
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    • v.12 no.2
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    • pp.53-60
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    • 2023
  • Recently, the demand and traffic volume for various multimedia contents are rapidly increasing through real-time streaming platforms. In this paper, we predict real-time streaming traffic to improve the quality of service (QoS). Statistical models have been used to predict network traffic. However, since real-time streaming traffic changes dynamically, we used recurrent neural network-based deep learning models rather than a statistical model. Therefore, after the collection and preprocessing for real-time streaming data, we exploit vanilla RNN, LSTM, GRU, Bi-LSTM, and Bi-GRU models to predict real-time streaming traffic. In evaluation, the training time and accuracy of each model are measured and compared.

Development of RTSP Media Server Using IOCP &Multi-Thread (IOCP와 Multi-Thread를 이용한 RTSP Media Server 개발)

  • 김수진;김익형;권장우
    • Proceedings of the Korea Multimedia Society Conference
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    • 2002.11b
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    • pp.767-770
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    • 2002
  • 본 논문에서는 RTSP 프로토콜을 제어하기 위한 서버 시스템을 IOCP 기반의 Multi-Thread 기법을 이용하여 구현하는 방법을 소개한다. 다수의 클라이언트에 대한 응답을 Thread로 구성하는 부분에서 Multi-Threading을 이용함으로써 수행 속도를 높이고 Winsock2에서 제공하는 IOCP(T/O Completion Port)를 이용하여 견고하고 확장이 용이한 RTSP(Real Time Streaming Protocol) 스트리밍 서버를 개발하였다.

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Design and Performance Evaluation of Replication Policy For Streaming Media Cache Server (스트리밍 미디어의 캐쉬 서버를 위한 재배치 정책의 설계와 성능분석)

  • 임은지;정성인
    • Proceedings of the Korea Multimedia Society Conference
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    • 2003.11b
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    • pp.921-924
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    • 2003
  • 본 논문은 인터넷 상에서 서비스되는 스트리밍 미디어를 캐쉬 서버에서 캐슁할 때 적용할 수 있는 재배치 정책에 관한 것이다. 스트리밍 미디어의 특성에 적합한 재배치 기준을 제시하고, 그에 따라 미디어 데이터를 캐슁하고 재배치하는 방법을 제안한다. 또한, 제안한 재배치 정책과 기존의 알려진 방법들에 대한 성능 비교 분석을 수행 한다.

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A Streaming System based on Transcoding using the Prediction Period (예측주기를 이용한 트랜스코딩 기반의 스트리밍 시스템)

  • Kim, Sung-Min;Kim, Hyun-Hee;Park, Si-Yong;Chung, Ki-Dong
    • Journal of KIISE:Software and Applications
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    • v.33 no.10
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    • pp.823-835
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    • 2006
  • Multimedia is a very popular service in the Internet. But, we cannot provide multimedia service at a uniform content, because networks and devices are various. Thus, an adaptive service is needed for multimedia transmission. Video Transcoding is the good solution that can service multimedia adaptively. This paper proposes the streaming system that is composed of encoder, transcoder, decoder The encoder enhanced time complexity and PSNR in case of transcoding using PP(Prediction Period). The decoder is almost same as the traditional media player. Transcoder reduced time complexity through combination of prediction period in encoder and skipping period to control frame rate in transcoder. In simulation results, the performances of proposed scheme outperform the system with traditional transcoder in time complexity and PSNR.

Design and Implementation of Buffer Cache for EXT3NS File System (EXT3NS 파일 시스템을 위한 버퍼 캐시의 설계 및 구현)

  • Sohn, Sung-Hoon;Jung, Sung-Wook
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.12
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    • pp.2202-2211
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    • 2006
  • EXT3NS is a special-purpose file system for large scale multimedia streaming servers. It is built on top of streaming acceleration hardware device called Network-Storage card. The EXT3NS file system significantly improves streaming performance by eliminating memory-to-memory copy operations, i.e. sending video/audio from disk directly to network interface with no main memory buffering. In this paper, we design and implement a buffer cache mechanism, called PMEMCACHE, for EXT3NS file system. We also propose a buffer cache replacement method called ONS for the buffer cache mechanism. The ONS algorithm outperforms other existing buffer replacement algorithms in distributed multimedia streaming environment. In EXT3NS with PMEMCACHE, operation is 33MB/sec and random read operation is 2.4MB/sec. Also, the buffer replacement ONS algorithm shows better performance by 600KB/sec than other buffer cache replacement policies. As a result PMEMCACHE and an ONS can greatly improve the performance of multimedia steaming server which should supportmultiple client requests at the same time.