Play live streams registered with Google Cloud Video Stitcher API

This guide demonstrates how to use the IMA DAI SDK for Roku to request and play a live stream for an event registered with the Google Cloud Video Stitcher API, and how to insert an ad break during playback.

This guide expands on the basic example from the Get started guide for IMA DAI.

For information on integrating with other platforms or on using the IMA client-side SDKs, see Interactive Media Ads SDKs.

Set up a Google Cloud project

Set up a Google Cloud project and configure service accounts to access the project.

Register a live stream event using your own content live stream or a test live stream. This guide expects an HLS stream.

Enter the following variables for use in the IMA SDK:

The Google Cloud region where your live config was created: LOCATION
Project number
The Google Cloud project number using the Video Stitcher API: PROJECT_NUMBER
OAuth token

A service account's short lived OAuth token with the Video Stitcher user role:


Read more about creating short-lived credentials for service accounts. The OAuth token can be reused across multiple requests as long as it has not expired.

Network code

The Ad Manager network code for requesting ads: NETWORK-CODE

Live config ID
The live config ID you specified when creating your live stream event: LIVE_CONFIG_ID
Custom asset key
The Ad Manager custom asset key generated during the process of registering a live stream event with the Video Stitcher API: ASSET_KEY

Download the basic example

Download and run the IMA Roku DAI Basic Example. Click the play button on the video player to start the short film "Tears of Steel", which contains ad breaks every 30 seconds.

Request a live stream

To replace the sample stream with your Cloud Video Stitcher live stream, you will need to use the sdk.createVideoStitcherLiveStreamRequest() function. Once your DAI session is live, you can use the Google Ad Manager UI to locate the generated DAI sessions for monitoring and debugging purposes.

In the existing sample, there are conditional statements to determine whether to construct a VOD StreamRequest or a live StreamRequest. To make it work with the Google Cloud Video Stitcher API, you will need to add a new path to construct a Cloud Video Stitcher live StreamRequest using the values generated previously.



<?xml version="1.0" encoding="utf-8" ?>
<component name="MainScene" extends="Scene" initialFocus = "myVideo">
<script type="text/brightscript">
  function init() ="myVideo") = 1
    m.testLiveStream = {
      title: "Live Stream",
      assetKey: "c-rArva4ShKVIAkNfy6HUQ",
      apiKey: "",
      type: "live"
    m.testVodStream = {
      title: "VOD stream"
      contentSourceId: "2548831",
      videoId: "tears-of-steel",
      apiKey: "",
      type: "vod"
    m.testVideoStitcherLiveStream = {
      title: "Video Stitcher Live stream",
      customAssetKey: "ASSET_KEY",
      networkCode: "NETWORK_CODE",
      liveConfigId: "LIVE_CONFIG_ID",
      region: "LOCATION",
      projectNumber: "PROJECT_NUMBER",
      oAuthToken: "OAUTH-TOKEN",
      apiKey: "",
      type: "stitcherLive"
  end function

  function loadImaSdk() as void
    m.sdkTask = createObject("roSGNode", "imasdk")
    m.sdkTask.observeField("sdkLoaded", "onSdkLoaded")
    m.sdkTask.observeField("errors", "onSdkLoadedError")

    ' Set this to the stream data you would like to play.
    selectedStream = m.testVideoStitcherLiveStream
    m.videoTitle = selectedStream.title
    m.sdkTask.streamData = selectedStream

    m.sdkTask.observeField("urlData", "urlLoadRequested") =
    ' Setting control to run starts the task thread.
    m.sdkTask.control = "RUN"
  end function


  Sub loadStream()
    sdk = m.sdk

    request = {}
    streamData =
    if streamData.type = "live"
      request = sdk.CreateLiveStreamRequest(streamData.assetKey, streamData.apiKey)
    else if streamData.type = "vod"
      request = sdk.CreateVodStreamRequest(streamData.contentSourceId, streamData.videoId, streamData.apiKey)
    else if streamData.type = "stitcherLive"
      request = sdk.CreateVideoStitcherLiveStreamRequest(
      request = sdk.CreateStreamRequest()
    end if

    request.player = m.player
    request.adUiNode =

    requestResult = sdk.requestStream(request)
    If requestResult <> Invalid
      print "Error requesting stream ";requestResult
      m.streamManager = Invalid
      While m.streamManager = Invalid
        m.streamManager = sdk.getStreamManager()
      End While
      If m.streamManager = Invalid or m.streamManager["type"] <> Invalid or m.streamManager["type"] = "error"
        errors = CreateObject("roArray", 1, True)
        print "error ";m.streamManager["info"]
        errors.push(m.streamManager["info"]) = errors
      Else = True
      End If
    End If
  End Sub


Once you've added these changes, reload the app to request and play your custom live stream.

Insert an ad break

While playing your custom live stream, try inserting an ad break channel event using the Google Cloud Live Stream API. The ad break should be inserted and played immediately.

Clean up

Now that you have successfully hosted a live stream using the Google Cloud Video Stitcher API and requested it using the IMA DAI SDK for Roku, it's important to clean up any serving resources.

Follow the Unregister live stream events guide to end your live stream event.