视频简单地说就是活动的图像。保存和描述数字视频的简单方法就是记录和描述连续的一帧帧的静止图像。保存静止图像的最简单格式是BMP格式,就是位图。BMP是未经压缩的原始图像保存格式,采用RGB描述。数字视频流则采用YUV描述。所以播放视频时,要将YUV格式的数据转换成RGB格式显示。至于YUV与RGB如何相互装换,这里不详细介绍,网上有一大堆资料。 一、视频压缩 mpeg视频压缩编码后包括三种元素:I帧(I-frames)、P帧(P-frames)...
layer 2 / layer3 Switch Software Architect/Lead 1. good embedded software development experience with Linux applications, GCC, C/C++, real time programming, Linux Kernel, Linux driver, MySql, SNMP. 2. excellent working experience on layer 2 Ethernet Switch and data communications protocols such as 802.1, 802.3, MEF (Carrier Ethernet ), Ethernet Ring Protection (ERPS , G.8032), VALN, Q-in-Q V-...
Fix is simple, just modify getlhs.c and return ETHHDR_SIZE Like this: ... } else if ( strstr(ifname, "eth") ) { linkhdr_size = ETHHDR_SIZE; return 0; } else if ( strstr(ifname, "br") ) { // 本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u/5591/showart_2149488.html
安装了FC10系统后,直接启动应用程序-->影音-->音乐播放器或者视频播放器进行播放音乐文件时,提示解码器需要安装,用它自己的搜索功能,又说搜索不到,找了好半天都没有见到这些解码器下载,谁找到请共享一下,谢谢。
[root@ben ~]# su -c 'rpm -Uvh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm' Retrieving http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm Retrieving http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm...
mpeg的全称是运动图像专家组(Moving Picture Experts Group),是专门制定多媒体领域内的国际标准的一个组织。该组织成立于1988年,由全世界大约300名多媒体技术专家组成。包括mpeg视频、mpeg音频和mpeg系统(视音频同步)三个部分。 mpeg压缩标准是针对运动图像而设计的、基本方法是——在单位时间内采集并保存第一帧信息,然后就只存储其余帧相对第一帧发生变化的部分,以达到压缩的目的。 mpeg压缩标准可实现帧之间的压...
The ISDN Network layer is also specified by the ITU Q-series documents Q.930 through Q.939. layer 3 is used for the establishment, maintenance, and termination of logical network connections between two devices. SPIDs Service Profile IDs (SPIDs) are used to identify what services and features the telco switch provides to the attached ISDN device. SPIDs are optional; when they are used, they are ...
The ISDN Physical layer is specified by the ITU I-series and G-series documents . The U interface provided by the telco for BRI is a 2-wire, 160 kb/s digital connection. Echo cancellation is used to reduce noise, and data encoding schemes (2B1Q in North America, 4B3T in Europe) permit this relatively high data rate over ordinary single-pair local loops. 2B1Q 2B1Q (2 Binary 1 Quaternary) is the...
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