MPTS转多路SPTS的IP输出实现

介绍了一种接收解码器,它是一种广泛应用于三网融合的信源接收设备,它可以将接收到的MPTS多节目传输流转换为多个SPTS单节目传输流,并且通过TS OVER IP的形式将各个节目分别输出到不同的IP主机或端口.详细介绍了整个系统各个模块的功能和实现过程.     

MPEG-2传输流多路复用的软件设计与实现

对13818-1系统部分码流结构进行分析,对节目特殊信息(PSI)获取、重构、PID重映射、节目参考时钟(PCR)修正等关键技术进行了研究.结合交织调度算法,加入空包补偿,用软件方法设计并实现了基于MPEG-2传输流的多路复用器.通过测试,该复用器可将6路单节目传输流(SFIS)复用为1路多节目传输流(MPTS),并且解复用后,视频、音频具有很好的同步效果.     

MPEG-2传输流多路复用的软件实现方法

提出了一种MPEG-2单节目传输流多路复用的软件实现方案。该方法在不改变原有单路传输流(TS)的节目参考时钟(PCR)的情况下,通过修改参加复用的传输流的节目特殊信息(PSI)以及将公共包识别符(PID)进行重新映射,并利用传输速率和PCR之间的关系,仅采用控制空包插入个数以及各传输流中TS包插入位置的方法,将参加复用的各路单节目传输流复用为一路多节目传输流。     

MPEG-2复用器PSI信息分析部分的FPGA实现

从实用的角度出发,针对MPEG-2复用器输入传输流的节目特殊信息表可能有一个或多个分段,以及一个分段可能有一个或多个传输流包的情况进行详细的探讨,并提出节目特殊信息分析提取的FPGA实现方案。最后通过实际码流的测试,证明该方案的可行性。     

CBTV卫星直播平台中的CA应用（上）

CBTV平台是由中广影视卫星公司运营的卫星电视直播平台，它于1999年1月1日开播．目前包括“村村通”境内节目和境外平台节目两部分，共5个传输流51套节目，平台的传输系统采用DVB-S标准，因而平台选用的条件接收(Conditional Access，CA)系统也必须满足DVB-S所定义的CA规范。     

MPEG-2解码器级联问题及解决方法

随着广播电视数字技术的发展和应用,现在广播电视系统的发射台、网络中心机房和播控机房等都使用数字广播电视信号,其格式为经MPEG-2编码压缩后的ASI传输流。在一个ASI传输流上可传输多套广播电视节目,要从多节目ASI传输流里获取多套节目,就存在着如何从一个ASI流通过多台解码器解多套节目的问题。     

数字电视节目切换方法的研究及应用系统设计

数字电视节目的切换是数字电视的重要业务之一.提出了一种数字电视节目切换方法,可以将一路数字电视传输流中的一套或多套节目替换为另一数字电视传输流中的一套或多套节目,并使替换后的数字电视传输流保持有相同的各种标识符.利用该方法可以实现数字电视节目的无缝切换,且电路具有结构简单、硬件设备少、成本低、速度快等优点.     

基于PC实现的HDTV传输流解复用

根据实际应用需要,将数字卫星接收机接收到的HDTV多节目传输流(MPTS)解成单节目传输流(SPTS)用于编辑站编辑处理,并实现解复用后的单节目传输流的任意恒定码率变换.其中的关键技术是PSI/SI信息的重置和码率变换时产生的PCR抖动校正.该方法基于PC实现,在实际应用中具有良好的效果.     

TANDBERG TT7116 IP传输流处理器

TANDBERG TT7116传输流处理器是构筑未来宽带IP广播头端建设的基石。TT7116可将多节目传输流转换成单节目传输流,并将处理后的单节目传输流映射到各自的IP多点传送组中。TT7116传输流处理器有效地将MPEG—2/DVB与IP宽带网络结合在一起,构造新的视频信号传输解决方案。     

CBTV境外平台介绍

一 CBTV境外平台简介 CBTV境外平台是由中广影视卫星公司运营的卫星直播平台．平台目前有3个传输流、共31套境外节目(实际按4个传输流配置)，分别上行至鑫诺1号卫星4A、5A和1A三个Ku波段的转发器，每个转发器的节目如表1所示。     

Virtual Internet broadcasting

This article describes the design and first implementation of a virtual broadcast system whereby a multimedia content program can be edited, produced, and streamed from different locations. Data are stored and distributed decentrally, allowing multiple combinations of program objects to new programs. The virtual broadcast station is the network. This concept additionally offers the clients the opportunity to obtain an individual (personalized) program, still using bandwidth-economic multicast technologies. This is achieved by dividing multimedia streams into temporal chunks (chunk streams), streamed over different multicast host groups (distributed multicasting), using existing Internet session control protocols (SDP) and Internet transport protocols (RTP). A client application assembles the transmitted chunks to form an individual program. This technique can also be used to insert personal/local advertisements into broadcast-like services     

Flexible and robust packet transport for digital HDTV

The packet-oriented transport approach used in the advanced digital television (ADTV) system for terrestrial HDTV broadcast is described. ADTV achieves robust HDTV delivery on terrestrial simulcast channels via MPEG video compression, prioritization of MPEG data, and `cell-relay' type packet transport in conjunction with a two-tier physical transmission scheme. General design issues relevant to the development of the proposed transport protocol are discussed. ADTV's prioritization algorithm for partitioning MPEG-encoded video into high-priority (HP) and standard-priority (SP) bit streams is outlined. The data transport format supporting these prioritized compressed video bit streams is described. The three principal sublayers of the ADTV transport protocol are discussed in terms of specific functions, impact of system performance, and hardware implementation factors. A proof-of-concept simulation model that incorporates transport encoding and decoding functionality is outlined, and performance evaluation results are given for illustrative transmission scenarios     

浅谈演播室直播的安全策略

随着电视现场直播这种手段在现代电视传媒的应用越来越广泛，保障现场直播的安全显得尤为重要，它在一定程度上体现了电视台的节目制作能力和技术水平，已成为所有电视台永恒的追求目标。结合太原电视台新闻频道用于新闻直播的演播室系统的实际应用情况，分别从系统的设计（包括视频、音频、灯光、电源、计算机等）和使用的角度阐述了有效提高演播室直播安全系数的经验和体会。     

融媒时代电视直播与新媒体技术的融合应用

基于专业生产内容(Professional Generated Content,PGC)模式的电视新媒体直播,是一种将传统电视直播优势与数字技术、网络技术及移动技术进行充分融合的新直播方式.结合实际运用经验,探讨融媒时代下电视新媒体直播技术平台系统的设计原则、系统搭建流程、具体应用指标及关键技术.     

基于软件无线电的中短波接收机设计

目前广播系统正由模拟体制向数字化体制过渡,数字版权管理（DRM,Digital Radio Mondiale）系统就是针对30 MHz以下频段的数字广播标准。作为软件无线电的核心技术之一,数字接收机技术得到了越来越普遍的应用。介绍了一种基于软件无线电的中短波接收机的硬件系统结构,这种软件无线电接收机结构可以同时解码音频和数据流,兼容目前的模拟调幅广播和数字调幅广播标准。重点讨论了电调滤波器的设计,最后使用EDA软件进行仿真,并给出了仿真结果。     

微信高清和电视标清同时直播的应用

随着移动互联网时代的快速发展,活动举办单位已不满足于传统的电视直播,活动举办方更喜欢在微信公众号上直播,只有少量大型需要集中收看的活动,才采取电视和微信同时直播。由于微信直播是高清的,如果电视播出系统是标清的,要想实现微信和电视同时直播,就需要将现场采集视音频信号进行处理转换,才能同时直播。     

Effective multi-program broadcasting of prerecorded video using VBR MPEG-2 coding

The tradeoff between picture quality and bandwidth usage is a prominent issue in the world of broadcasting. Since broadcasters are able to transmit multiple streams simultaneously in a channel, they face the challenge of guaranteeing the contracted picture quality required by each of the transmitted video streams while maximizing the number of video streams carried in each channel. We have developed an easy to implement MPEG-2 based multi-program video coding system suitable for digital TV broadcast, video on demand, and high definition TV over broadcast satellite networks with limited bandwidth. Compared to present broadcast systems and for the same level of contracted picture quality, our system greatly increases the number of video streams transmitted in each channel. As a result, either a large number of transponders can be freed to carry real-time broadcasting or the level of picture quality can be significantly increased. By switching from tape storage to video server technology, the need for numerous playback (VTR) systems at the headend is eliminated. In addition, the most of the complete MPEG-2 encoders are replaced by much less complex MPEG-2 transcoders. All this means a much more cost-effective solution for broadcast stations.     

Large-scale personalized video streaming with program insertion proxies

Increasingly intelligent Internet overlay networks promise to deliver streaming media and value-added media services in ways that cannot be achieved easily with conventional broadcast networks. Such an overlay would allow an individual viewer or groups of viewers to receive unique programming content (e.g., commercial advertisements, entertainment) that matches their previously specified preferences. Toward this end, we introduce a scalable overlay network architecture and signaling mechanism that permits dynamic program insertions in live high-quality video streams transmitted over IP networks. We describe the implementation of an application proxy that dynamically inserts prerecorded video programs into NTSC Dl quality motion-JPEG streams with no visible artifacts. We argue that on-demand program switching is merely a first step toward a new generation of media services; increases in computing power ultimately permits network-based proxies to manipulate and augment multimedia content as it flows through the network.     

网络电视直播系统的建立

结合网络电视在校园网内的应用实践,介绍网上电视直播系统的基本原理及基于Microsoft Windows Media建立网络电视直播系统的方法与配置。     

3G技术在电视民生新闻直播中的应用

鉴于民生新闻直播中亟待突破的传播瓶颈,阐述电视民生新闻直播现状及基于3G的新闻直播系统的关键技术,介绍3G技术在电视直播中的系统实现原理以及在唐山广播电视台直播50分节目中的应用实践,在3G技术和民生新闻直播之间找到一个结合点,建立3G直播资讯技术平台。