Demo App: Building with the Pre-Call API

GUEST POST: is a custom design & development agency focused on building WebRTC applications. They are part of AgilityFeat, which is one of our development partners at TokBox. Jean Lescure from their team wanted to share their experiences using our new API for detecting call quality.

DemoBack in August TokBox announced their new Pre-Call API, for testing out bandwidth conditions, and posted a repository on github with a proof of concept. At we saw a great opportunity to build upon that project and got working on creating a demo app out of it, including a server implementation in NodeJS which is compatible with Heroku.

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Webinar: How to Build Multi-Party Calling with WebRTC


WebRTC is maturing and we can see the needs in the market evolving along with this.

However, with the increased need for rich, digital experiences comes the challenge of building more advanced applications. We know that building real-time video communications can be challenging, especially when it involves more than two participants. To pull off a multi-party call using WebRTC off-the-shelf you’ll need a strong backend infrastructure and a deep understanding of media processing.  That’s why we are looking forward to exploring this topic with WebRTC expert, Tsahi Levent-Levi, founder of, in our upcoming webinar.

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Introducing the OpenTok Debugger Tool

tokbox-inc_markWhen an issue is reported with an application, an early debugging step is to reproduce the problem. Because our platform is an API, and developers use it for many different kinds of applications, TokBox employees used to have to reproduce problems by building a new application for each new use case. After doing that a couple of times, we wizened up and started using pre-built sample applications as the starting point. This still meant that any functionality that wasn’t generic needed to be added in. What we really needed was an application that used a myriad of features we offered: Enter the TokBox Live Debugger.

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Demo application: OpenTok 3D


The OpenTok.js SDK integrates beautifully into current HTML elements, providing a great variety of layouts and styles. But why should we stick to the traditional 2D design? Modern browsers offer us the power of 3D visualization with WebGL, a technology that has already opened up a new world of interaction and presentation of data within the browser domain.

With an objective to take advantage of the possibilities of 3D within the browser,  we created the  OpenTok 3D demo. The OpenTok 3D demo is a multi-party video application which shows how we can integrate the OpenTok.js API with WebGL technology using the three.js library. One of the objectives of this demo application is to inspire people building on top of the OpenTok.js SDK, showing them the beginning of endless possibilities on how we can present the video screens in a true 3D world.  Cameras, lights, textures, rendering effects, and more, can be leveraged to enrich the final experience.

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The OpenTok Platform Collaborative Editor

Screen Shot 2014-09-16 at 6.01.54 AMWe always want to share as much as possible with our community so today we’re sharing a description of how we developed the opentok-editor collaborative editor using ot.js and CodeMirror. You can see the editor in action at and you can see how to use it for yourself at the opentok-editor github page. We love to see people using our open source projects so please feel free to file issues and contribute pull-requests to this project on Github.

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