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从DVI光纤的传说稳定性看各种不同的花屏现象

date:On December 12, 2017 Source:  

   DVI光纤延长模块包含DVI光纤接收器和发送器两部分与传统使用双绞线进行传输的DVI/HDMI长线传输器(放大器)相比。

DVI Fiber Optic Extension Module Includes DVI Fiber Optic Receiver and Transmitter Two-Part Versus DVI / HDMI Long-Line Transmitter (Amplifier) Traditionally Used for Twisted Pair Transmission。

信号传输方案

   (1)衰减小、抗干扰性强、稳定性高、尤其不受外界环境的变化而损伤信号。

(1) small attenuation, strong anti-interference, high stability, especially from the external environment changes and damage the signal.


   我们经常在地铁站、路边广告屏、公交车上可看到花屏、断屏、闪屏等现象均为信号传输不稳定、损伤造成。

We often in the subway station, roadside advertising screen, bus can see Huaping, broken screen, splash screen and other phenomena are unstable signal transmission, damage caused.


   (2)价格相当、安装同样简便、售后维护费用更低。

(2) the price is quite, installation is equally simple, after-sale maintenance costs lower.


   首先我们要明白,黑屏、花屏、闪屏等问题,可能是推流端的问题,也可能是播放器的问题,遇到这些现象,我们要第一时间用别的播放器(如VLC,ffplay)试试,如果都出现同样的问题,那么多半是流本身的问题了,反之,则很可能是播放器的问题。

First of all, we have to understand that black screen, Huaping, splash screen and other issues may be streaming end of the problem may also be a player problems encountered these phenomena, we want the first time with other players (such as VLC, ffplay) Try, if you have the same problem, then most of the flow itself is the problem, on the contrary, it is likely to be a player problem.


   播放画面出现图像紊乱,大面积的异常颜色的方块图,或者绿屏现象

Play screen appears image disorder, a large area of unusual color block diagram, or green screen phenomenon


   1.丢失参考帧导致的

1. Lost frame of reference


   一般H.264码流有I、B、P三种帧类型,I帧是关键帧,B帧是双向预测内插编码帧,P帧是前向预测编码帧。

General H.264 stream I, B, P three types of frames, I frame is the key frame, B-frame is bi-directional predictive interpolation coding frame, P-frame is forward predictive coding frame.


   I帧由于是帧内压缩,因此可以独立解码播放,而B帧,一旦丢失了I帧或者后面的P帧,则会解码失败,而P帧一旦丢失了前面的I/B/P帧,也会导致解码失败。

Because I frames are compressed in frames, they can be decoded and played independently. However, once I frames or later P frames are lost in B frames, decoding fails, and once the previous I / B / P frames are lost in P frames, Will result in decoding failure.


   对于丢失了参考帧而导致的解码失败,一般就会出现花屏的现象,花屏的严重程度依赖于丢失的参考帧对即将解码的帧的重要程度。

Huaneng often appears the phenomenon of the decoding failure caused by the loss of the reference frame, the severity of the Huaping depends on the importance of the missing reference frame on the frame to be decoded.


   DVI光纤延长器的组成,目前市面上主要的视频传输线有单根导线、双绞线、同轴电缆等,下面我们就简单的对长距离传输中视频线的优缺点进行下介绍。不论任何的电缆类型,它们都是作为信号传输的一种导体。这些不同类型的电缆,在传输不同信号的质量表现也有区别,除了部分特殊的应用,目前应用于音视频传输的电缆大致以单根导线、双绞线、同轴线和光纤为主. DVI延长器主要功能是长距离传输高清视频信号,随着用户对高清音视频信息的要求越来越高,为满足用户对高品质的音视频追求各个信号源、显示终端以及中间处理设备的厂商攻克一个个难题,推出一系列高端产品。

DVI fiber extender composition, the market currently has a major video transmission line with a single wire, twisted pair, coaxial cable, etc. Here we simply on the advantages and disadvantages of long-distance transmission video line under the introduction. Regardless of the type of cable, they are all used as a conductor for signal transmission. These different types of cables, in the transmission of different signal quality performance is also different, in addition to some special applications, currently used in audio and video transmission cable is generally a single wire, twisted pair, coaxial cable and optical fiber. The main function of the device is to transmit high-definition video signals over long distances. As users' requirements for high-definition audio and video information become higher and higher, manufacturers of video signal terminals, display terminals and intermediate processing equipment A problem, launched a series of high-end products.


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