• Title, Summary, Keyword: Video4Linux

Search Result 10, Processing Time 0.07 seconds

An Experimental Analysis of Linux TCP Variants for Video Streaming in LTE-based Mobile DaaS Environments (LTE 기반 모바일 DaaS 환경에서 비디오 스트리밍을 위한 Linux TCP 구현물의 실험적 성능 분석)

  • Seong, Chaemin;Hong, Seongjun;Lim, Kyungshik;Kim, Dae Won;Kim, Seongwoon
    • IEMEK Journal of Embedded Systems and Applications
    • /
    • v.10 no.4
    • /
    • pp.241-255
    • /
    • 2015
  • Recent network environment has been rapidly evolved to cloud computing environment based on the development of the Internet technologies. Furthermore there is an increasing demand on mobile cloud computing due to explosive growth of smart devices and wide deployment of LTE-based cellular networks. Thus mobile Desktop-as-a-Service(DaaS) could be a pervasive service for nomadic users. In addition, video streaming traffic is currently more than two-thirds of mobile traffic and ever increasing. All such trends enable that video streaming in mobile DaaS could be an important concern for mobile cloud computing. It should be noted that the performance of the Transmission Control Protocol(TCP) on cloud host servers greatly affects Quality of Service(QoS) of video streams for mobile users. With widely deployed Linux server platforms for cloud computing, in this paper, we conduct an experimental analysis of the twelve Linux TCP variants in mobile DaaS environments. The results of our experiments show that the TCP Illinois outperforms the other TCP variants in terms of wide range of packet loss rate and propagation delay over LTE-based wireless links between cloud servers and mobile devices, even though TCP CUBIC is usually used in default in the current Linux systems.

Implementation of 4-channel Embedded DVR Based on Linux (리눅스 기반 4채널 임베디드 DVR 구현)

  • 이흥규;정갑천;최종현;박성모
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.2677-2680
    • /
    • 2003
  • This paper describes the implementation of a 4 channel embedded DVR system. It receives analog video from CCD cameras and converts to 640${\times}$480 CCIR-656 digital video by 30 frames/sec. These digital images are compressed to the wevelet transformed image using hardware codec which is capable of 350:1 real-time compression and decompression. The DVR is working on linux and it implemented on an embedded system which is based on StrongARM processor. For the interface between processor system module and image processing module, GPIO and memory control module are used, device drivers are developed. Linux kernel source is customized. This paper provides techniques of embedded system development and embedded linux porting.

  • PDF

A Study of Real-Time Video Streaming Data Service on the Linux Server (리눅스 서버를 이용한 동영상 데이터 실시간 스트리밍 서비스 연구)

  • Jang, Seung-Ju;Heo, Won-Yeong;Yoo, Hyun-Min;Lee, Chang-Hoon;Shin, Woo-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.17 no.4
    • /
    • pp.893-901
    • /
    • 2013
  • This paper suggests a method of developing live media streaming service through Linux server system on android system environment. The android application constructed in the experiment is able to record media while sending it to Linux server. Generated real time media data is send to linux server through Multipart Request class of Apache Tomcat server constructed on Linux system. Also in this research, by utilizing Android video player and media player class, development of android application structures was accomplished, which has methods of; playing live media stream data on video server, or playing live media stream data while saving stream data in cache. The structure and function of suggested system and application is confirmed by series of experiments.

Implementation of an USB Camera Interface Based on Embedded Linux System (임베디드 LINUX 시스템 기반 USB 카메라 인터페이스 구현)

  • Song Sung-Hee;Kim Jeong-Hyeon;Kim Tae-Hyo
    • Journal of the Institute of Convergence Signal Processing
    • /
    • v.6 no.4
    • /
    • pp.169-175
    • /
    • 2005
  • In recent, implementation of the embedded system is gradually in the spotlight of world-wide by information technology(IT) engineers. By this time, an implementation of real time system is limited on image acquisition and processing system in practical. In this paper, the USB camera interface system based on the embedded linux OS is implemented using USB 2.0 camera with low cost. This system can obtain image signals into the memory via X-hyper255B processor from USB camera. It is need to initialize USB camera by the Video4Linux for the kernel device driver. From the system image capturing and image processing can be performed. It is confirmed that the image data can be transformed to packet of Network File System(NFS) and connected to the internetwork, then the data can be monitored from the client computer connected to the internetwork.

  • PDF

The Study on the Development of the Realtime HD(High Definition) Level Video Streaming Transmitter Supporting the Multi-platform (다중 플랫폼 지원 실시간 HD급 영상 전송기 개발에 관한 연구)

  • Lee, JaeHee;Seo, ChangJin
    • The Transactions of the Korean Institute of Electrical Engineers P
    • /
    • v.65 no.4
    • /
    • pp.326-334
    • /
    • 2016
  • In this paper for developing and implementing the realtime HD level video streaming transmitter which is operated on the multi-platform in all network and client environment compared to the exist video live streaming transmitter. We design the realtime HD level video streaming transmitter supporting the multi-platform using the TMS320DM386 video processor of T.I company and then porting the Linux kernel 2.6.29 and implementing the RTSP(Real Time Streaming Protocol)/RTP(Real Time Transport Protocol), HLS(Http Live Streaming), RTMP(Real Time Messaging Protocol) that can support the multi-platform of video stream protocol of the received equipments (smart phone, tablet PC, notebook etc.). For proving the performance of developed video streaming transmitter, we make the testing environment for testing the performance of streaming transmitter using the notebook, iPad, android Phone, and then analysis the received video in the client displayer. In this paper, we suggest the developed the Realtime HD(High Definition) level Video Streaming transmitter performance data values higher than the exist products.

Embedded SoC Design for H.264/AVC Decoder (H.264/AVC 디코더를 위한 Embedded SoC 설계)

  • Kim, Jin-Wook;Park, Tae-Geun
    • Journal of the Institute of Electronics Engineers of Korea SD
    • /
    • v.45 no.9
    • /
    • pp.71-78
    • /
    • 2008
  • In this paper, we implement the H.264/AVC baseline decoder by hardware-software partitioning under the embedded Linux Kernel 2.4.26 and the FPGA-based target board with ARM926EJ-S core. We design several IPs for the time-demanding blocks, such as motion compensation, deblocking filter, and YUV-to-RGB and they are communicated with the host through the AMBA bus protocol. We also try to minimize the number of memory accesses between IPs and the reference software (JM 11.0) which is ported in the embedded Linux. The proposed IPs and the system have been designed and verified in several stages. The proposed system decodes the QCIF sample video at 2 frame per second when 24MHz of system clock is running and we expect the bitter performance if the proposed system is designed with ASIC.

Design and Implementation of Fish Farm Monitoring System using Embedded System (임베디드 시스템을 이용한 양어장 모니터링 시스템의 설계 및 구현)

  • 이준택;조수현;신동헌;김영학
    • The Journal of the Korea Contents Association
    • /
    • v.3 no.1
    • /
    • pp.71-79
    • /
    • 2003
  • Up to row, researchers have observed experiment environment to study about raising procedure and an ecology of the ocean fishes with naked eye. Then they can monitor status information in only laboratory such as temperatures, image of the fish farm, etc. Such the existing way as this can't observe an ecology of the ocean fishes with scientific and systematic method and moreover it needs many of researchers. So in this paper, we design and implement a fish farm monitoring system which receives status of remote experiment environment through the internet whenever you want it and wherever you want it, and monitors and analyzes its status using embedded system of which the operating system is linux.

  • PDF

Development of Progressive Download Video Transmission EDR based RTOS on Wireless LAN (RTOS 기반 무선랜 장치가 연결된 영상기록저장장치의 Progressive Download 방식 영상전송 기술 개발)

  • Nahm, Eui-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.66 no.12
    • /
    • pp.1792-1798
    • /
    • 2017
  • Event Data Recorder(Car Black-Box) with WiFi dongle have been released, and the platform of the majority is the Linux platform. This is because the platform development is possible in little investment cost by reducing the source licensing costs by taking advantage of the open source. But utilizing Linux platform has the limitations of boot-up time and consuming processing power due to the limitation of battery capacity, to be cost-competitive to minimize the use of memory. In this paper, the real-time operating system(RTOS) is utilized to optimize these portions. MP4 encoder and Muxer are developed to be about ten seconds boot up and minimized memory. It has the advantages of operating at lower power consumption than the Linux utilizing WiFi dongle. Utilizing a WiFi dongle is to provide a progressive download feature on smart phones to lower product prices. But RTOS has the weakness in WiFi. Porting TCP /IP, Web and DHCP server and combination with the USB OTG Host interface by implementing the protocol stack are developed for WiFi. And also SPI NOR flash memory is utilized for faster boot time and cost reductions, low processing power to be consume. As the results, the developed proved the 10 seconds booting time, 24 frame rate/sec. and 10% lower power consumption.

A Study for the MPEG-4 Library to operate in real-time on the DSP (DSP상에서 실시간 처리 가능한 MPEG-4 Library에 관한 연구)

  • Hong, Sung-Hwa;Jung, Suk-Yong
    • Journal of the Korea Convergence Society
    • /
    • v.2 no.1
    • /
    • pp.7-13
    • /
    • 2011
  • Informations of multimedia centering in the images, are combined acoustic and letter, etc. Although the network advances and the capacity of the storage media extends, these huge informations will not be able to accommodate. From meaning which is like this, International standards for the compression and a multiplexing of image, acoustic and voice H261 where admits standard, JPEG, JBIG, MPEG-l, MPEG-2, MPEG-4 and H263, G series etc, are core techniques of multimedia. At initial step of the base technique which creates the base of like this multimedia service time, we developed the real-time MPEG-4 transmission systems to provides real-time MPEG-4 multimedia services. This system means becomes the base technique which hereafter is developed and is applied various system. This system Will be able to apply from a videoconference, a building protection system and a VOD video system to use the Internet. And, They, the image sensing, embedded linux, and MPEG4 software, will become sourceful technique to develop the different system.

Design And Implementation of Linux Based Parallel Media Stream Server System (리눅스 기반의 고성능 병렬 미디어 스트림 서버 설계 및 구현)

  • 김서균;김경훈;류재상;남지승
    • The KIPS Transactions:PartA
    • /
    • v.8A no.4
    • /
    • pp.287-292
    • /
    • 2001
  • Multimedia service systems should have efficient capacity to serve the growing clients and new data. In the general streaming services, users can endure the small amount of time delay at the beginning of service. But they want to have good quality of service. A streaming server tries to transfer video files to clients from a repository of files in real time. The server must guarantee concurrent and uninterrupted delivery of each video stream requested from clients. To achieve its purpose, many stream servers adopt multi-processors, sufficient memory, and RAID or SAN in their systems. In this paper, we propose a Linux-based parallel media streaming server. It is superior to the other systems in the storing structure, fault-tolerance, and service capacity. Since this system supports the web interlace, users can operate easily through the www. This system uses unique striping policy to distribute multimedia files into the parallel storage nodes. If a service request occurs, each storage node transmits striped files concurrently to the client. Its performance is better than the single media streaming service because of the parallel architecture.

  • PDF