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Design and Realization of H.264-based Embedded Real Time Video Acquisition and Transmission System

Author: HuangZhenHua
Tutor: LiuJinGao
School: East China Normal University
Course: Communication and Information System
Keywords: Embedded Linux PXA270 H.264 x264 Video4Linux Video Capture Video transmission
CLC: TN919.8
Type: Master's thesis
Year: 2008
Downloads: 863
Quote: 6
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Abstract


With the rapid development of communication and multimedia technology, high-quality video transmission has gradually become one of the major business expansion of the digital communications network to replace the traditional voice and text messages; microelectronics and embedded operating system development for digital network multimedia video communication terminal to create favorable conditions for merging embedded technology and network, communications and multimedia technologies will be the trend of the development of the field of digital video communication. Due to the limited bandwidth of the transmission of embedded digital communication system, the previous video compression coding technology is not conducive to the real-time transmission of high-quality live video. To the lowest possible bandwidth to transmit high-quality video images, promulgated by the Joint Video Experts Group (JVT) of the ITU-T Video Coding Experts Group (VCEG) and the ISO ╱ IEC Moving Picture Experts Group (MPEG) a new generation of video compression coding standard, the H.264/AVC. The H.264 standard introduces a series of advanced H.264 video compression coding key technology to effectively improve coding efficiency, but also increase the coding complexity of computing has become embedded video application constraints. Therefore, to achieve a large amount of computation efficiently on embedded devices, the high complexity of H.264 video compression coding challenging. H.264 real-time video communication system based on embedded solutions is still in the exploratory stage. This article aims to take advantage of the H.264 video coding standard embedded platform for research and development of real-time video communication system terminal. Paper based the PXA270 microprocessor Liod development platform, the embedded Linux technology and H.264 video communications technology combined program model provides embedded video server based H.264 real-time video capture and network transmission systems actual embedded video communication system design and development, has referential significance and practical value. The paper's main work and innovation is reflected in the following aspects: 1-depth study of embedded Linux development technology, established a based on Liod development board embedded Linux development platform, including the structure of the cross-compiler environment, Bootloader design, Linux 2.6 .22.6 kernel porting, device driver development and Busybox based root file system build. 2 USB camera driver based on the Video4Linux the real-time video capture technology, including the design and real-time video capture application design. Proposed application-oriented embedded real-time H.264 video compression coding scheme, and multimedia program optimization method based on the embedded processor architecture, compiler level and code-level optimization x264 open source encoder to achieve a real-time application requirements. 4 H.264 video transmission technology based on IP network designed video communication terminal Server / Client Services program, based on the VLC embedded real-time video capture and transmission system model.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Image communication, multimedia communication
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