Learn about OTT TV technology

Learn about OTT TV technology

OTT TV screen

The screen transfer function is one of the important functions of OTT TV. The current screen transfer technology includes DLNA, AirPlay, Miracast and some proprietary screen transfer protocols. The screen transfer function has broad application prospects in the fields of home entertainment and business office. DLNA's full name is Digital Living Network Alliance, which was founded by Sony, Intel, Microsoft, Google, etc., to solve the interconnection and interoperability of smart devices, so that digital media files can be transmitted and shared between different devices at will. AirPlay is a wireless sharing protocol developed by Apple. It can easily transfer documents wirelessly between different iOS devices through AirPlay technology. Miracast is a wireless transmission protocol initiated by the Wi-Fi Alliance. Miracast users can browse photos taken by smartphones on large-screen TVs, share notebook screens in real time through conference room projectors, or watch home OTT TVs on tablets. Live show.
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Many companies are developing the OTT TV screen function. The good screen-changing experience requires not only hardware support, but also application software support for mobile phones, OTT TVs and smart TVs. ShowKey is the founder and developer of the screen-transfer industry. A brand. ShowKey is like a magical key to turn on the smart TV function. Plug it into any big screen terminal with HDMI interface TV or projector. It is easy to connect directly to the high-definition smart TV in the home. Also like a master key that turns on the screen, you can turn the video, photo, and music playback screen on the mobile phone (whether Android or Apple IOS system) to the TV screen through WIFI or AP mode. Answering the phone to send text messages and entertainment features are not affected. It can also be remotely controlled by remote control or MINI USB mouse, so that you can enjoy "infinite control" when you watch TV at home. ShowKey also has “rich content”, and the video content resource network is open and crawling, with rich content and the fastest update, which is basically synchronized with current network or cinema information.

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Technical implementation

Currently, there are two main implementations of OTT TV: HTTP Progressive Download (HPD) and HTTP Adaptive Streaming (HAS). Traditional OTT TVs generally use HPD technology. The HPD-based client only needs to wait a short period of time to download and buffer the first part of the media file before starting playback, and then play it while downloading. HPD OTT TV has many limitations, such as: it is not suitable for the transmission of live programs with high real-time requirements; the waiting delay for initial playback is generally longer; when the network bandwidth is unstable, the card screen phenomenon is more likely to occur; The video file will continue to be downloaded, and when the user gives up the program to watch, it will cause a waste of downloaded files (consuming bandwidth).

In order to overcome the limitations of HPD OTT TV technology, HAS-based OTT TV technology has been widely adopted and promoted in the industry in recent years. HAS OTT TV uses video segmentation and adaptive bit rate (ABR) technology. In the HAS system, the media stream splitter splits the video stream output by the encoder into a series of consecutive, equal-length small slice files and stores them in a web content distribution server. The HAS client device automatically requests the web server for the appropriate video quality (ie different resolution and bit rate) fragmentation files based on the available bandwidth, giving the user the best visual experience. In order to facilitate the HAS client to achieve fast, real-time switching between different code rate slices, HAS video generally uses a shorter slice length (for example, 10 seconds). HAS is considered by the industry to be the core technology for multi-screen interactive video that is ubiquitous in the future, because the HAS system can provide video fragment files suitable for resolution to terminals of different screen sizes and achieve smooth video playback under different network bandwidth conditions. .

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