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播放闪屏的问题,DVI光纤传输没有这种现象

date:On December 12, 2017 Source:  

   DVI光纤传输的稳定性能,就是作为这种传输稳定产品的一种推出,或许偶尔看见自己的电脑连接视频的时候都会不稳定的花屏,卡屏就是这种现象导致,不得不推出DVI光纤的种类传输方案来稳定。好像闪屏问题,从根源来看,就是播放的过程中,出现了两种不同的画面来回切换,从而看起来像「闪屏」,比如,黑白两张图片交替渲染。下面我们再来看看直播场景下,什么原因会引发该现象。

DVI stable performance of optical fiber transmission, transmission is stable such as a product launch, perhaps occasionally see when your computer is connected to the video will be unstable video, card-screen phenomenon is the cause, we had to launch the kind of DVI Fiber Transmission scheme to stabilize. It seems like the splash screen problem, from the root cause, is that during the playback, two different screens appear to switch back and forth and thus look like "splash screens". For example, two black and white images are alternately rendered. Now let us look at the live broadcast scene, what causes this phenomenon.

DVI传输

   播放器缓冲机制原因-Player buffer mechanism


   网络不好的时候,播放器会频繁缓冲,曾遇到过一种案例,就是某直播App应用,在缓冲的时候,使用了一张广告图片,在某种极端弱网情况下,由于频繁缓冲,导致真实的播放画面和广告图片来回快速切换,导致闪屏现象。

When the network is not good, the player will be frequently buffered, have encountered a case, is a broadcast App applications, in the buffer when using an ad picture, in some extremely weak network circumstances, due to frequent buffer , Resulting in real-time playback of images and ads back and forth quickly switch, resulting in splash screen.


   这个情况是完全可以从播放器的缓冲策略上避免的,每次缓冲后,不要收到一帧后就立即渲染,而是适当地多缓冲一些数据,再发送缓冲结束的消息,从而可以频繁ms级别的缓冲切换产生的闪屏。

This situation can be avoided from the player's buffer strategy, each buffer, do not immediately receive a frame immediately after rendering, but the appropriate number of more buffered data, and then send the buffer end of the message, which can be frequent ms The level of the buffer switch generated splash screen.


   推流端的原因-Push the end of the reason


   推流端产生闪屏的流,往往发生在有画面合成的代码模块,比如:叠加水印、摄像头/图片切换推流、连麦合流等等。

Streams generated on the stream side of the splash screen, often occurs in the screen with the code module synthesis, such as: watermark superimposed, camera / picture switch push flow, and even the convergence of wheat and so on.


   画面的合成,一定要铭记一点,任何情况下,都要避免出现,有合成/没有合成两种画面的交替。

The composition of the screen, we must bear in mind that under any circumstances, to avoid the emergence of synthetic / no synthesis of two images of the alternating.


   然而DVI光纤在高清音视频信号的主体结构已经完善的情况下,如何让信号更加稳定的传输,业内许多厂商也花样百出。通常在工程安装中视频源、信号处理设备与显示终端之间的距离均无法直接用DVI/HDMI连接线进行连接,甚至许多设备厂商在安装工程时为追求更稳定的性能,降低后续维护成本,只要信号处理设备与显示终端超过10米的距离,他们都不再直接使用DVI/HDMI连接线直接进行连接。由此业内许多厂商推出一系列用于延长信号传输的产品。针对目前市场需求同三维推出了多种规格DVI光纤延长器,可传输500米、10千米、15千米,目前业内主要有使用双绞线进行传输的DVI/HDMI长线传输器(放大器),DVI/HDMI光端机以及DVI光纤延长模块(DVI信号光纤传输器)。

However, DVI optical fiber in the main structure of high-definition audio and video signals have been perfect, how to make the signal more stable transmission, many companies in the industry are also full of tricks. Typically the video source, the display signal processing device in the installation distance between the terminal are not directly connected with DVI / HDMI cable, even when many installation of equipment manufacturers to pursue a more stable performance, reduced ongoing maintenance costs, As long as the signal processing equipment and display terminals more than 10 meters away, they are no longer directly use the DVI / HDMI cable to connect directly. As a result, many manufacturers in the industry have introduced a series of products for extending signal transmission. According to the current market demand with the introduction of a variety of three-dimensional DVI optical fiber extender, can transmit 500 meters, 10 kilometers, 15 kilometers, the industry currently has a twisted pair to transmit DVI / HDMI long-haul transmitters (amplifiers) DVI / HDMI Optical and DVI Optical Extension Module (DVI Signal Optical Transmitter).


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