PTZ在NDI上的状态

The Network Device Interface (NDI) protocol released by NewTek in 2016 is one of the fastest-growing elements of the live production, 流媒体, 今天的广播世界. 它的迅速采用和发展是惊人的, and it continues to grow into other areas as more and more companies add it into their workflow. 每年, more manufacturers and software developers are integrating it into their product offerings.

NDI is enough of an industry force now that recent developments merit an in-depth look at its current state. I’ve spent the last few weeks researching companies that use NDI in their workflows, 制造商将其整合到他们的产品线中, and, 当然, NewTek对协议的持续开发. 以下是该研究的总结, 突出基于ndi的多摄像机现场制作, particularly as it involves pan-tilt-zoom (PTZ) cameras and integrated PTZ-NDI workflows.

But before we dig into the details about who’s doing what with NDI, 让我们来谈谈关于NDI创造者的最大新闻, NewTek:该公司最近被Vizrt收购.

Vizrt收购NewTek

在2019年NAB展上, Vizrt (pronounced Viz-R-T) and NewTek announced that the former was acquiring the latter. In many ways, the combining of these two companies makes tremendous sense. Both are software-focused outfits whose offerings complement each other well. Vizrt在广播图形方面名列前茅, 提供广泛的工具，如增强现实, 3 d图形, 自动化, 和虚拟集合. NewTek has for years been known primarily as the manufacturer of the wildly popular TriCaster series of live production switchers.

现在这两家公司已经联手了, the plan is to progressively combine their products over time. 在与NewTek的斯科特·卡罗尔和布莱恩·奥尔森的通话中, both men expressed NewTek’s and Vizrt’s commitment to continued development and expansion of NDI. It’s no mystery why they would continue to push the standard forward. 在短短3年的时间里，NDI的采用呈爆炸式增长. To date, the software development kit (SDK) that enables developers to implement NDI into their products has been downloaded more than 12,000 times. Combine that with dozens of manufacturers that are already using NDI in their products, 还会有更多, and you have a pretty good idea of where this 技术 is heading.

最近的变化

NewTek在2019年NAB展上发布了NDI 4版本, 该公告详细介绍了许多重大升级. The quality of NDI video was improved without increasing the bitrate. It now transmits 16 bits per pixel, which is good enough for high dynamic range (HDR) content. NDI HX (high-efficiency codec) is now integrated into the SDK rather than requiring a separate plugin. There’s also a discovery server that finds NDI sources without relying on mobile device management software (MDMS). This helps reduce network congestion when there are hundreds of sources all transmitting “I’m here” signals simultaneously and unnecessarily. Multi-Transmission Control Protocol (TCP) mode can now take advantage of hardware network accelerators. NDI native recording can be used to avoid recompressing footage.

Soon there will be a plugin for Adobe Creative Cloud to allow direct recording in apps like Premiere Pro. There’s also a plugin for Unreal Engine 4 to work with virtual reality 和虚拟集合. And if a camera loses power, the image will hold on the last good frame while recording continues. This way, 当电力恢复时, the recording picks back up and keeps that source in sync with all other sources.

在硬件方面, NewTek introduced new Spark Plus converters to use non-NDI sources with NDI systems. NewTek现在提供4K 30fps的型号，售价599美元(Figure 1)和售价499美元的1080p 60 FPS机型.

Figure 1. 新泰克的Spark SDI到NDI

最重要的是, camera and sensor powerhouse Sony introduced a lineup of PTZ cameras integrated with NDI (Figure 2). It joins a long list of manufacturers jumping onto the NDI train. 松下, Avid, 微软Skype, 史诗般的游戏, Magewell, 草谷, EVS, ChyronHego, 罗斯视频, and Atomos are all top-tier companies that have gone all in with NDI support.

Figure 2. 索尼BRC-X400 PTZ IP 4K摄像机

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