Chroma key compositing is the process that professional broadcasters use to incorporate two separate videos or media files into one final stream. Typically, this is used with a green screen or something similar. It can be useful for all kinds of broadcasts, including when you want to stream live video on your website directly via an online video platform.

In this post, we are going to discuss what chroma keying is before we dive into the 5 best live chroma key software on the market. We will take a look at the features, pros and cons, and pricing of each software and provide a quick tutorial for using chroma key compositing with each.


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Broadcasters can use live streaming software to access chroma key support. Five popular RTMP software encoders that support chroma keying include Wirecast, vMix, VidBlaster, Open Broadcaster Software (OBS) Studio, and Xsplit. All of these have controls and options that let you use the chroma key, and all of them are very easy to use.

Wirecast is a live broadcasting software from Telestream that enables live streaming to any RTMP destination. In addition to chroma keying with green screens, this software includes live switching, picture-in-picture composition, titles, audio delay, and other similar features.

Wirecast software is compatible with a wide range of capture cards, devices, and camera inputs. If you need to use pre-recorded video within your live broadcast, Wirecast makes this aspect easy, as well.

The latest version of Wirecast is 14.2. It is the newest full version and was released on April 28, 2021. It features several enhancements and fixes, including FBLive polling, re-written WebStream plugin, and Virtual Camera improvements.

vMix supports chroma keying with a green or blue screen. In addition to chroma key support, this platform includes native support for multi-bitrate streaming which is very useful for professional broadcasters who want to stream high-quality content.

vMix is available in four different versions, ranging from Basic HD to Pro, and the software comes with a free 60-day trial. Each version supports a different number of inputs, your purchase never expires, and includes the following versions:

vMix also offers a 60-day free trial and has all the features of vMix Pro including the ability to use resolutions greater than HD such as 4K, particularly to ensure vMix supports your computer hardware works with it before purchasing.

OBS Studio is a free chroma key software for live streaming. This software option is an open-source live stream broadcasting software package. In addition to chroma-keying, OBS Studio supports RTMP broadcasting, switching between multiple sources, and more.

Check out our post on the best OBS Studio settings for plugins to learn how to use NDI, a feature formerly only found on high-end encoders. Another interesting thing about OBS Studio is that it supports a plugin for pulling Tweets into your streams in real-time.

Xsplit was originally designed with video game streaming in mind, so its chroma key elements are well suited to placing an image into game footage. However, this software is also adaptable for other uses of chroma key.

When it comes to choosing the color of your screen, typically people choose Green. This is because it is a color that people rarely wear. Also, unlike red and blue, it is far less likely for Chroma Key to see these colors in your skin or hair. We recommend checking out our guide to finding the right green screen for more on this.

Finally, light is very important when using Chroma Key. If your screen has shadows on it, it will be much harder for your chroma key software encoder to recognize the color it is supposed to be removing.

We encourage you to take advantage of free trials of the different software to see which one works best for your streaming setup. It is important to make sure that the chroma key software works seamlessly with your professional video hosting platform.

ATEM Constellation switchers feature a compact rack mount design with a built in control panel. This allows operation of the switcher, critical during setup or for emergency use. Also included is a large LCD so you can see program output and change switcher settings via on screen menus. The compact design is perfect for portable live production, with the rear of the switcher including connections for 3G-SDI or 12G-SDI inputs, aux outputs, balanced audio and Ethernet for control. The top 4 M/E models even include RS-422 for serial control and MADI digital audio connections. Even with all this power, ATEM Constellation is extremely quiet with its innovative high efficiency thermal system.

For live streaming, the USB-C connection on ATEM Constellation operates as a webcam source. That means you can plug into a computer and get working with any video software! The software is tricked into thinking the ATEM Constellation is a common webcam, but it's really a live production switcher! That guarantees full compatibility with any video software in full resolution 1080HD quality. Choose any software you like, such as Zoom, Microsoft Teams or Skype for a new way to do presentations with a professional multi camera broadcast quality style! The ATEM Constellation webcam output also works with streaming software such as Open Broadcaster, XSplit Broadcaster and more!

ATEM Constellation includes a wide range of broadcast quality native transitions such as mix, dip, wipe, and more. All transitions can be customized in the system control menus with adjustments for border color, border width, position, direction and a lot more! The ATEM Constellation switcher includes a powerful digital video effects processor for DVE transitions, which can be used to squeeze the current picture off screen revealing a new video under it. The DVE can even be used to create graphic wipe transitions. To eliminate errors, ATEM Constellation features a preview transition feature so you can setup your transitions before you switch it on air!

ATEM Constellation features up to 4 independent DVEs, depending on the model, that let you reposition graphics and create picture in picture compositions. You get amazing quality and the DVE supports position, resize and scale, all in real time. The DVE lets you create professional picture in picture effects with customizable 3D borders, shadows and lighting. DVEs can also be used to create amazing DVE transitions with squeeze and swoosh effects for adding excitement to your programming. You can even combine DVE transitions with custom graphics to create your own graphic wipe transitions! Then the 2 and 4 M/E models include SuperSource processors for even more DVEs!

For news or virtual set work, ATEM Constellation is perfect as it features lots of ATEM advanced keyers for high quality chroma or luminance keying! The chroma keyer is incredibly powerful and features a color picker to sample background colors for automatic generation of the key parameters. You get precise controls for edge and flare, and there is even a foreground color corrector so you can match the "look" of the foreground layer to the background layer making seamless compositions possible. The keyer can also be used for pattern and DVE keying! You get 4 ATEM Advanced Keyers on the 1 M/E models, 8 ATEM Advanced Keyers on the 2 M/E models and 16 ATEM Advanced Keyers on the 4 M/E models.

With 4 upstream chroma keyers per M/E row, you get the perfect solution for building virtual sets! With so many ATEM advanced chroma keyers, you can use a keyer per camera to create a seamless composition of the camera over the custom background. Even the 1 M/E models have enough keyers to generate a 4 camera virtual set! You can use external image processors for virtual sets, or you can even build a fixed camera virtual set by loading pre rendered still image backgrounds from the media players and media pool. You can setup macros to change cameras and load the correct background into the media players! With so much flexibility, you can experiment to try out different studio setups!

With up to 40 multi rate SDI input connections, depending on the model, the ATEM Constellation is compatible with all types of video sources. You can connect equipment in HD or Ultra HD television standards including 720p, 1080i,1080p and 2160p formats. Only multi rate SDI allows switching between formats so you can instantly adapt to the needs of the job you are doing anywhere in the world! The SDI inputs will also handle embedded audio and mix audio from all video inputs. The program outputs include talkback, tally and camera control information. So you can connect any of the switcher SDI outputs back to the camera for program return, camera control, and talkback.

With a built in Fairlight audio mixer, the ATEM Constellation makes it possible to do extremely complex live sound mixing. The internal mixer has up to 156 input channels, for the biggest audio mixer in a live production switcher! Audio is de-embedded from all the SDI video inputs and passed to the audio mixer. Then the 4 M/E models have extra audio mixer input channels for the MADI audio inputs. Each input channel features the highest quality 6 band parametric EQ and compressor, limiter, expander and noise gate as well as full panning. All this audio power can be controlled via the ATEM Software Control or a Mackie compatible panel.

The ATEM Software Control Panel gives you total control over your switcher and is included free. The ATEM Software Control Panel features a beautifully designed interface with a visual switcher and parameter palettes for making quick adjustments. Multiple users can connect to the switcher via Ethernet and all work on different parts of the event at the same time! The ATEM Software Control also lets you access camera control, audio mixing, media, macro programming and even control of HyperDeck disk recorders. You can even save the full state of the switcher as XML files, plus all media is backed up from the media pool. Plus you can run the software on Mac or Windows! 152ee80cbc

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