Getting Started​ with the IVS Web Broadcast SDK | Real-Time Streaming

This document takes you through the steps involved in getting started with the IVS real-time streaming Web broadcast SDK.

Imports

The building blocks for real-time are located in a different namespace than the root broadcasting modules.

Using a Script Tag

Using the same script imports, the classes and enums defined in the examples below can be found on the global object IVSBroadcastClient:

const { Stage, SubscribeType } = IVSBroadcastClient;

Using npm

The classes, enums, and types also can be imported from the package module:

import { Stage, SubscribeType, LocalStageStream } from 'amazon-ivs-web-broadcast'

Server-Side Rendering Support

The Web Broadcast SDK Stages library cannot be loaded in a server-side context, as it references browser primitives necessary to the functioning of the library when loaded. To work around this, load the library dynamically, as demonstrated in the Web Broadcast Demo using Next and React.

Request Permissions

Your app must request permission to access the user’s camera and microphone, and it must be served using HTTPS. (This is not specific to Amazon IVS; it is required for any website that needs access to cameras and microphones.)

Here's an example function showing how you can request and capture permissions for both audio and video devices:

async function handlePermissions() {
   let permissions = {
       audio: false,
       video: false,
   };
   try {
       const stream = await navigator.mediaDevices.getUserMedia({ video: true, audio: true });
       for (const track of stream.getTracks()) {
           track.stop();
       }
       permissions = { video: true, audio: true };
   } catch (err) {
       permissions = { video: false, audio: false };
       console.error(err.message);
   }
   // If we still don't have permissions after requesting them display the error message
   if (!permissions.video) {
       console.error('Failed to get video permissions.');
   } else if (!permissions.audio) {
       console.error('Failed to get audio permissions.');
   }
}

For additional information, see the Permissions API and MediaDevices.getUserMedia().

List Available Devices

To see what devices are available to capture, query the browser's MediaDevices.enumerateDevices() method:

const devices = await navigator.mediaDevices.enumerateDevices();
window.videoDevices = devices.filter((d) => d.kind === 'videoinput');
window.audioDevices = devices.filter((d) => d.kind === 'audioinput');

Retrieve a MediaStream from a Device

After acquiring the list of available devices, you can retrieve a stream from any number of devices. For example, you can use the getUserMedia() method to retrieve a stream from a camera.

If you'd like to specify which device to capture the stream from, you can explicitly set the deviceId in the audio or video section of the media constraints. Alternately, you can omit the deviceId and have users select their devices from the browser prompt.

You also can specify an ideal camera resolution using the width and height constraints. (Read more about these constraints here.) The SDK automatically applies width and height constraints that correspond to your maximum broadcast resolution; however, it's a good idea to also apply these yourself to ensure that the source aspect ratio is not changed after you add the source to the SDK.

For real-time streaming, ensure that media is constrained to 720p resolution. Specifically, your getUserMedia and getDisplayMedia constraint values for width and height must not exceed 921600 (1280*720) when multiplied together.

const videoConfiguration = {
  maxWidth: 1280,
  maxHeight: 720,
  maxFramerate: 30,
}

window.cameraStream = await navigator.mediaDevices.getUserMedia({
   video: {
       deviceId: window.videoDevices[0].deviceId,
       width: {
           ideal: videoConfiguration.maxWidth,
       },
       height: {
           ideal:videoConfiguration.maxHeight,
       },
   },
});
window.microphoneStream = await navigator.mediaDevices.getUserMedia({
   audio: { deviceId: window.audioDevices[0].deviceId },
});