There are many benefits of adding streaming capabilities or immersive virtual experiences to your app. In a nutshell, live streaming helps to engage users, encourage them to stay in the app, and ultimately drive revenue. Sendbird’s live streaming capabilities can be used for influencer broadcasting, e-commerce, podcasts, live event streaming, gameplay broadcasting, and much more.
In this tutorial, we’ll explore:
- How to build a simple JS application to broadcast live video content to a large number of participants
To get the most out of this tutorial, we recommend:
- An IDE that can serve simple HTML web pages or alternatively serve the HTML pages via Chrome’s web server plugin
We recommend that you check out this GitHub repo for the full code.
You may also find it useful to go through the short video walkthrough of the service in use.
Let’s get started! 💻
How to build a live streaming app: Implementation (Structure)
Sendbird Live has two personas: the host and the participant. The host controls the event video and audio broadcast. The participant fetches the event and consumes the video and audio.
When an event is in the ongoing state, the host is streaming to Sendbird’s servers which then broadcast to the participants.
Actions that are communicated via the websocket when the event is set to ‘Ready’ by the host, and the participants have entered, include:
- Event status changes (Please see the docs for details.)
- Real time entering and exiting of the event both by participants and the host(s)
- Real time changes in the media options such as turning the video and audio on and off.
Below is a high-level sequence of events for creating, hosting, viewing, and exiting a live streaming event. In the following section, we’ll take a look at the code for each of these steps.
This section describes in more detail the code for the live event streaming steps outlined above.
Host → Connect to Sendbird
Host → Create a new event (state = created)
Note: Events can have only one directional state → created → ready → ongoing → ended.
Participant → Login
Participant → Fetch the event
Note that the participant cannot enter or subscribe to the event or its event handlers.
Host → Fetch event
Host → Enter event and add handlers
Host → Changes event status to ready
Note that there is no signal for this status change.
Participants → Enter and subscribe to event handlers
Consider that the participant needs to fetch the event again and again until they have the latest version which has the ready state.
Host → Changes event status to ongoing
The participant will get these events: liveEventStarted, hostStartedVideo, hostStoppedAudio.
Host → Updates their view to display the live stream
Participant → Gets status change → manually starts consuming the stream
Host and participants → Event handlers fire during the ongoing events
Please see this list of events and their handlers. The events are mostly for the participants, as the host’s method calls have callbacks. Remember that a participant cannot enter a live event and receive events until the live event’s status has been changed to Ready by the host.
Host → Changes event status to ended
Participant → Gets the event end handler
Participant → Exits the event
Host → Exits the event
Don’t forget to check out the live streaming demo. You can find the complete code on GitHub. If you have questions, check out the Sendbird Community or contact us if you’d like to talk with an expert.
Happy live streaming! 💻