Refer to our Detecting the Dominant Speaker developers guide for further guidance. Twilio’s Dominant Speaker Detection API makes it possible for developers to be notified when the Dominant Speaker changes in a Group Room. by representing it larger in the central area of the UI). Many videoconferencing applications enhance the Dominant Speaker (e.g. The Dominant Speaker is the participant having the highest audio activity at a given time. The Network Bandwidth Profile API uses Track priorities to assign bandwidth to tracks. The Track Priority API allows developers to set the relative priority of Tracks in a video application. This is a critical API for creating high-quality Group Room applications. The Network Bandwidth Profile API (aka BW Profile API) is a Twilio Video API specifically designed for optimizing bandwidth utilization in Group Rooms. For further information, you may read our Managing Codecs and Working with VP8 Simulcast developer guides. VP8 Simulcast is a scalable version of the VP8 codec. VP8 and H.264 are the two main codecs used for videoconferencing. Please, read our Understanding Video Rooms guide for further guidance.Ī codec refers to a type of algorithm that encodes a video signal typically compressing it in the process. P2P and Group Rooms and the two main building blocks of Twilio Programmable Video APIs. It is typically measured in terms of bps ( bits per second) sometimes prefixed with a power of 10 prefix (e.g. The bitrate refers to the number of bits that a given video or audio stream consumes when being transported through a digital network. Hence, an video will comprise a sequence of 30 HD still images per second. It is typically expressed in terms of fps ( frames per second). The frame-rate refers to the number of still images that the video stream includes per time unit. The following resolutions are common:įullHD (Full High Definition) - aka 1080p The resolution refers to the dimensions of such a matrix expressed as width x height. Video tracks can be understood as sequences of still images each of which is encoded as a matrix of pixels. You may find useful the following concepts and definitions: Hence, before starting developing a high-quality video application, first you must wonder: what do end-users need and expect? Having a precise answer to that question will help you make the most appropriate decisions for quality optimization. For example, if you increase the video resolution then the battery consumption and the networking costs will also increase. Some of the variables affecting quality inversely impact one another. However, the quality of experience may also be impacted by other aspects such as battery consumption, availability of computing and networking resources, etc. high resolution, high frame-rate, etc) and low latency (i.e. They allow end-users to communicate “as they do face-to-face.” Hence, end-users expectations are high fidelity (i.e. Videoconferencing is the most typical use-case of real-time video applications. With Twilio Programmable Video, quality is a synonym of Quality of Experience understood as to how well a video application solves to end-users’ needs and addresses their expectations. Quality is an elusive concept that may have different meanings in different contexts. grid, collaboration or presentation) use this section. To choose the Room type see this Section.Mobile SDK: clients using Twilio Android SDK or iOS SDK.Mobile Browser: clients using Twilio JavaScript SDK on supported mobile browsers.Desktop Browser: refers to clients using Twilio JavaScript SDK on desktop/laptop supported browsers.Use this table as a fast guide to find the recommended settings for your application. Developing Applications with presentation mode.Developing Applications with collaboration mode.Network Bandwidth Profile API: Selecting the mode.P2P or Group Rooms: Which Room Should I use?.For an optimal end-user experience, we highly recommend that you read the complete Twilio Programmable Video documentation and tailor our general recommendations provided here to your specific use-case. This guide provides advice for developing high-quality Twilio Video applications. User Identity & Access Tokens for Programmable Video Insights, Troubleshooting, and Diagnostics.Specify Audio and Video Constraints in JavaScriptĭeveloping High Quality Video ApplicationsĪdd Programmable Voice Participants to Video RoomsĬonfiguring Audio, Video Input and Output devices Understanding Video Recordings and Compositions Tutorials and More Getting Started Resources
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