• Title/Summary/Keyword: Video-on-Demand

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Rate Adaptation for HTTP Video Streaming to Improve the QoE in Multi-client Environments

  • Yun, Dooyeol;Chung, Kwangsue
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.11
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    • pp.4519-4533
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    • 2015
  • Hypertext Transfer Protocol (HTTP) adaptive streaming has become a new trend in video delivery. An HTTP adaptive streaming client needs to effectively estimate resource availability and demand. However, due to the bitrate of the video encoded in variable bitrate (VBR) mode, a bitrate mismatch problem occurs. With the rising demand for mobile devices, the likelihood of cases where two or more HTTP adaptive streaming clients share the same network bottleneck and competing for available bandwidth will increase. These mismatch and competition issues lead to network congestion, which adversely affects the Quality of Experience (QoE). To solve these problem, we propose a video rate adaptation scheme for the HTTP video streaming to guarantee and optimize the QoE. The proposed scheme estimates the available bandwidth according to the bitrate of each segment and also schedules the segment request time to expedite the response to the bandwidth variation. We used a multi-client simulation to prove that our scheme can effectively cope with drastic changes in the connection throughput and video bitrate.

Design and Implementation of a Low-level Storage Manager for Efficient Storage and Retrieval of Multimedia Data in NOD Services (NoD서비스용 멀티미디어 데이터의 효율적인 저장 및 검색을 위한 하부저장 관리자의 설계 및 구현)

  • Jin, Ki-Sung;Jung, Jae-Wuk;Chang, Jae-Woo
    • The Transactions of the Korea Information Processing Society
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    • v.7 no.4
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    • pp.1033-1043
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    • 2000
  • Recently as the user request on NoD (News-on-Demand) is largely increasing, there are a lot of researches to fulfill it. However, because of short life-cycle of new video data and periodical change of video data depending on anchor, it is difficult to apply the conventional video storage techniques to NOD applications directly. For this, we design and implement low-level storage manager for efficient storage and retrieval of multimedia data in NOD Services. Our low-level storage manager not only efficiently sotres video stream dat of new video itself, but also handles its index information. It provides an inverted file method for efficient text-based retrieval and an X-tree index structure for high-dimensional feature vectors. In addition, our low-level storage manager provides some application program interfaces (APIs) for storing video objects itself and index information extracted from hierarchial new video and some APIs for retrieving video objects easily by using cursors. Finally, we implement our low-level storage manager based on SHORE (Scalable Heterogeneous Object REpository) storage system by sunig a standard C++ language under UNIX operating system.

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Understanding the User Preferences in the Types of Video Censorship

  • Park, Sohyeon;Kim, Kyulee;Oh, Uran
    • International Journal of Internet, Broadcasting and Communication
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    • v.14 no.2
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    • pp.147-161
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    • 2022
  • Video on demand (VOD) platforms provide immersive, inspiring, and commercial-free binge watching experiences. Recently, the number of these platform users increased dramatically as users can enjoy various contents without physical and time constraints during COVID-19. However, such platforms do not provide sufficient video censorship services while there is a strong need. In this study, we investigated the users' desire for video censorship when choosing and watching movies on VOD platforms, and how video censorship can be applied to different types of scenes to increase the censoring effect without diminishing the enjoyment. We first conducted an online survey with 98 respondents to identify the types of discomfort while watching sexual, violent, or drug-related scenes. We then conducted an in-depth online interview with 18 participants to identify the effective video filtering types and regions for each of the three scenes. Based on the findings, we suggest implications for designing a censor application for videos that contain uncomfortable scenes.

Nonlinear Moving Picture Editor for Multiple Watermarking (다중 워터마킹을 지원하는 비선형 동영상 편집기)

  • 윤석민;한경섭;정순기
    • Journal of the Korea Society of Computer and Information
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    • v.7 no.2
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    • pp.124-129
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    • 2002
  • Currently, image processing are used widely and have various types of characteristics with the applications of VOD(Video on demand), the web casting services, the video conference systems and virtual realities. Using the scene change, at every time of video image transitions, an editor can classify the video context and also require a function of in(Boxing insertion. Digital watermarking provides a solution to illegal copying of digital contents and has many other useful applications, including web broadcast monitoring, transaction tracking, authentication, copy control and device control. The Purpose of this thesis is to implement of nonlinear moving picture editor for the multiple watermarking. For the effective watermarking performance, this thesis considers the protection of image quality reduction and robustness for hiding information concurrently.

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Bandwidth Efficient Harmonic Staggered Broadcasting Method for Multimedia on-Demand Services (주문형 멀티미디어 서비스를 위한 대역폭 효율적인 하모닉 스태거드 전송 기술)

  • Kim, Hong-Ik;Park, Sung-Kwon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.12B
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    • pp.1076-1086
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    • 2006
  • In providing video-on-demand (VoD) services to a number of clients through networks, the bandwidth requirements of video transmission restrict VoD services. For this reason, many significant broadcasting-based VoD schemes have been proposed to efficiently support services. However, the broadcasting-based VoD schemes approach needs frequency channel hopping, using many channels at the same time and managing many segments of a video. These make it difficult to implement. In this paper, we propose a Harmonic Staggered broadcasting scheme which has a simple structure and substantially improved VoD efficiency. The numerical results demonstrate that the viewer's waiting time of the Harmonic Staggered broadcasting scheme is close to the harmonic broadcasting scheme and the maximum buffer requirements of this can be adapted for demanding rate by adjusting the short front part of a video sizes.

Design of Interactive Operations using Prefetching in VoD System (VoD 시스템에서 선반입 기법을 이용한 대화식 동작의 설계)

  • Kim, Soon-Cheol
    • Journal of Korea Society of Industrial Information Systems
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    • v.15 no.2
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    • pp.31-39
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    • 2010
  • VoD(Video-on-Demand) servers have to provide timely processing guarantees for continuous media and reduce the storage and bandwidth requirements for continuous media. The compression techniques make the bit rates of compressed video data significantly variable from frame to frame. A VoD system should be able to provide the client with interactive operations such as fast forward and fast rewind in addition to normal playback of movie. However, interactive operations require additional resources such as storage space, disk bandwidth, memory and network bandwidth. In a stored video application such as VoD system, it is possible that a priori disk access patterns can be used to reserve the system resources in advance. In addition, clients of VoD server spend most of their time in playback mode and the period of time spent in interactive mode is relatively small. In this paper, I present the new buffer management scheme that provides efficient support for interactive operations in a VoD server using variable bit rate continuous media. Simulation results show that our strategy achieves 34% increase of the number of accepted clients over the LRU strategy.

Traffic analysis and storage allocation in a hierarchical two level network for VOD service (2계층 VOD 서비스망에서의 트래픽 분석과 저장용량 결정)

  • 김여근;김재윤;박승현;강성수
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 1996.04a
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    • pp.89-92
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    • 1996
  • It is generally recognized that Video On Demand (VOD) service will become a promising interactive service in B-ISDN. We consider a hierarchical two level network architecture for VOD service. The first level consists of connected Local Video Servers(LVSs) in which a limited number of high vision programs are stored. The second level has one Central Video Server(CVS) containing all the programs served in the network. The purpose of this paper is to analyze the network traffic and to propose the storage policy for LVSs. For this purpose, we present an analysis of program storage amount in each LVS, transmission traffic volume between LVSs, and link traffic volume between CVS and LVSs, according to changing the related factors such as demand, the number of LVSs is also presented on the basis of the tradeoffs among program storage cost, link traffic cost, and transmission cost.

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MPEG-based Transcoding for Scalable Video-on-Demand System

  • Naoki-Kobayashi;Satoshi-Ishibashi;Susumu-Ichinose
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 1999.06a
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    • pp.63.1-68
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    • 1999
  • MPEG-2 transcoding scheme is proposed as scalable transmission system for a video-on-demand system is described. In this system video contents encoded by MPEG-2 are transmitted to receiver terminals via communication lines that have different bit rate. A transcoding technique that directly converts a bit stream encoded by MPEG-2 into a lower coding rate stream without decoding is proposed. The transcoder called Trampeg includes size reduction and frame drop approach. The experimental results show that an MPEG-2 stream of 0 Mbps is able to be transcoded into a stream of 1.5 Mbps-300 Kbps.

Design and Evaluation of a Dynamic Disk Striping and a Group-Alternation Round-Robin Data Placement Method for Video-on-Demand Serves (주무형 비디오 서버를 위한 동적 디스크 스트라이핑과 그룹교대 라운드로빈 데이터 배치 방법의 설계 및 평가)

  • 배인한;이재경
    • Journal of Korea Multimedia Society
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    • v.2 no.1
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    • pp.22-29
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    • 1999
  • In video-on-demand systems, movies are striped across the disks of the array in a video server to support multiple access. The blocks of the movies have to be placed carefully on the disks of the array in a video server in order to avoid load imbalance across these disks as well as to achieve maximum utilization of both space and bandwidth of these disks. This paper proposes a movie placement method called the GARR (group-alternation round-robin) that is based on the dynamic disk striping method considering the popularity of movie. The GARR uses group-alternation as movie selection policy and round-robin as data placement policy, where group-alternation allocates popular movie and unpopular movie groups to disks alternately. The performance of the GARR is evaluated by simulations.

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Fast Staggered Data Broadcasting and Receiving Scheme for Simple and Efficient Video on Demand Services (주문형 비디오 서비스의 복잡성와 대역폭 효율을 개선한 Fast Staggered 방식)

  • Kim Hong-Ik;Park Sung-Kwon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.7B
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    • pp.668-678
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    • 2006
  • In designing a video-on-demand (VoD) system, one of the major challenges is how to reduce the viewer's waiting time maintaining a given bandwidth allocation and how to reduce the client's buffer requirements. To solve these problems, many VoD schemes were proposed. However, most VoD schemes require managing many segments of a video, frequency channel hopping, and using many channels at the same time. Therefore, to the complexity is a barrier to implementation. In this paper, we propose a fast staggered broadcasting scheme which has a simple structure and substantially improved VoD efficiency. The numerical results demonstrate that the viewer's waiting time of the fast staggered broadcasting scheme is close to the fast broadcasting scheme and the buffer requirements of this can be adapt for demanding rate by adjusting the short front part of a video sizes.