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Design and Implementation of High-Resolution
and High-Quality Video Transport System
Interview video about this project
 Name of Researcher:
Jun MURAI
Professor, the Faculty of Environmental Information,
and the Graduate School of Media & Governance, Keio University (Group Leader), Ph.D
Osamu NAKAMURA
Associated Professor, the Faculty of Environmental Information, Ph.D
Hiroyuki KUSUMOTO
Associated Professor, the Faculty of Environmental Information, Ph.D
Noriyuki SHIGECHIKA
Lecturer, the Faculty of Environmental Information, Ph.D
Masaki MINAMI
Lecturer, the Faculty of Environmental Information, Ph.D
Kazunori SUGIURA
Visiting Researcher, the Graduate School of Media & Governance, Ph.D
Outline of Research:
This research focuses on a contribution to high quality video and audio transport system using network infrastructure. Our objective is to enhance the realization of higher communication environment using easy high quality transport application. Basic structure of DVTS (Digital Video Transport System) is based on transporting DV (Digital Video) through the Internet. DVTS realizes cost effective solution using DV, to perform high quality audio and video communications. Our research goal of this year is to enhance usability of DVTS by implementing multiple audio transmission system, portability enhancement to DVTS, Multi point, real time editing capability, and implementation of MPEG2-TS. We established a new communication model using DVTS as a base of communication method.
Details of the Research:
We research about improvement DVTS, and new communication models using DVTS as a base of communication method.
The researches for development and improvement DVTS
- Enhancing the Quality of DV over RTP with Redundant Audio Transmission
In this research, A scheme for reducing the packet loss probability of DV/RTP audio data is introduced. We have created a DV based broadcast quality video transportation tool, DVTS. Using DVTS, high quality video transportation over the Internet can be realized with low cost. However, DVTS does not have any error correction scheme. Moreover, it does not support reliable data transportation. Thus, a single packet loss can deteriorate the audio quality. In this research, redundant transportation of DV audio data is introduced. Using this redundant scheme, the DV audio will be robust. High quality audio can be realized in networks with packet loss.
- Portable Video Conference Tool using Notebook Computers and DV camera with RMS.
In this research, we established a assimilation of devices that are used in trend computation environment to the users more effectively with collaboration of application. We designed the user oriented resource management mechanism called RMS (Resource Management Scheme). DVTS (Digital Video Transport System) and DVoD (Digital Video-on-Demand). Massive network demonstration based on this system outcomes with impressive decrease in power consumption, with effective adaptability in networks resulting packet-loss free communications. When adapting RMS to service environment, such as SoHo(Small Office Home Office) server, collaborative enhancement in devices to users economizes the resource consumption with required efficiency.
- Construction of DV Transceiver System using small removable medias.
In this research, Digital Video Transport System (following, DVTS) which is DV transmission system was started from the single floppy disk, and the mechanism which enables transmission (dvsend) of DV data and reception (dvrecv) of DV data was built. By this mechanism, Linux Kernel which included the necessary minimum function in DVTS starting, and the compressed file system were used, and these were mounted as a system which operates on one floppy disk. The root file system was developed to RAMDISK at the time of booting. Moreover, in the file system, the tool which sets up the IP address other than DVTS (dvsend and dvrecv), the tool which checks the state of a network were stored. According to this mechanism, it becomes unnecessary to have performed environmental construction by the existing hard disk, and became realizable DV transmission and reception. Moreover, it became possible by developing a file system on RAMDISK not to perform operation equivalent to the conventional UNIX environment, and to shut down a power supply.
- MPEG2-TS Transport System enhancement for DVTS
The design and implementation of transport system for video and audio stream based on MPEG2-TS (MPEG2 Transport Stream) using network as a transport layer. Implemented system can transmit and playback the video and audio data using generous PC and consumer digital AV (Audio and Visual) appliances.
In this research, we focus on MPEG2-TS which are capable of changing the quality of video and audio variably coupled with network bandwidth. User can playback the MPEG2-TS video which is transferred from the IP network with considerable bandwidth and quality according to each communication environment.
The reaches about communication based on DVTS
- The Implementation of Remote Shooting System for Digital Cinema
This research proposes a development of practical remote shooting system. This system realizes shooting scenes at multiple places in widely distributed environment, and provides the method of real time editing and high quality video/audio preview. This system enables real time editing and preview by synchronization video/audio streams sent by multiple places. We implemented remote shooting system for digital video, and evaluated it on experimental environment. Based on the results, it was proved that this system can be made fit for practical use.
- Stored DV data Transmission Mechanism for Internet VoD
We introduced a high-quality scalable Video on Demand (VoD) System with a mechanism which allows Internet hosts to transmit stored Digital Video (DV) data. This system acts by client-server model application on the Internet, and is called DVoD system (Digital Video on Demand System). DVoD client provides user interface of the VoD service for online viewers. DVoD server stores DV data which were captured from DV equipments connected via IEEE1394 bus, and transmits them to client. To achieve optimum transmission of stored DV data, we propose a unique rate control scheme for network friendliness. By applying this scheme to transmission module inside of DVoD server, we could maximize the scalability as a complex of DVoD system and improve network utilization. We discussed three evaluation results from different perspectives to examine the video quality, scalability and network friendliness of our system. We adopted DV as video format of this system, therefore users can grant satisfaction equivalent to quality of broadcast TV picture.
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