An example of an instream pre-roll ad using Prebid.js and Kaltura.
Important: This example uses a test version of Prebid.js hosted on our CDN that is not recommended for production use. It includes all available adapters. Production implementations should build from source or customize the build using the Download page to make sure only the necessary bidder adapters are included.
Warning: Do not forget to exchange the placementId in the code examples with your own placementId!
<script>
var pbjs = pbjs || {};
pbjs.que = pbjs.que || [];
/* PRE-DEFINE `invokeVideoPlayer`
Because we have no way of knowing when all the bids will be
returned from Prebid we can't be sure that the browser will
reach the point where `invokeVideoPlayer` is defined before
`bidsBackHandler` fires and tries to call it.
To prevent an "`invokeVideoPlayer` not defined" error, we
pre-define it before we make the call to Prebid, and redefine
it later on with the code to create the player and play the
ad.
In this first version it simply stores the winning VAST to use
later. */
var tempTag = false;
var invokeVideoPlayer = function(url) {
tempTag = url;
}
var videoAdUnit = {
code: 'video1',
mediaTypes: {
video: {
context: 'instream',
playerSize: [640, 480],
mimes: ['video/mp4'],
protocols: [1, 2, 3, 4, 5, 6, 7, 8],
playbackmethod: [2],
skip: 1
}
},
bids: [{
bidder: 'appnexus',
params: {
placementId: 13232361 // Add your own placement ID here
}
}]
};
pbjs.que.push(function() {
pbjs.addAdUnits(videoAdUnit); // add your ad units to the bid request
pbjs.setConfig({
debug: true,
cache: {
url: 'https://prebid.adnxs.com/pbc/v1/cache'
}
});
pbjs.requestBids({
bidsBackHandler: function(bids) {
var videoUrl = pbjs.adServers.dfp.buildVideoUrl({
adUnit: videoAdUnit,
params: {
iu: '/19968336/prebid_cache_video_adunit',
cust_params: {
section: 'blog',
anotherKey: 'anotherValue'
},
output: 'vast'
}
});
invokeVideoPlayer(videoUrl);
}
});
});
</script>
<div id="myPlayer" style="width:640px; height:480px;"></div>
<!-- INCLUDE KALTURA PLAYER SCRIPT
Add the script for your Kaltura player. This will be part of
the code you will copy-paste from Kaltura. -->
<script src="https://cdnapi.kaltura.com/p/2222001/sp/222200100/embedIframeJs/uiconf_id/37440401/partner_id/2222001"></script>
<script>
invokeVideoPlayer = function(url) {
/* EMBED KALTURA PLAYER
Call `kWidget.embed()` and pass in a JSON object of your
player settings. Most of this JSON object will be part of
the code you will copy paste from Kaltura.
Documentation for kWidget available here:
https://player.kaltura.com/docs/kwidget */
kWidget.embed({
"targetId": "myPlayer",
"wid": "_2222001",
"uiconf_id": 37440401,
/* ADD VAST SETTINGS TO THE PLAYER SETTINGS
Inside `flashVars`, add another key called `"vast"` and
pass in a JSON object with:
- the position where you want your ad to play
- the URL of the ad (which in this case will be the `url`
we got back from Prebid) */
"flashvars": {
"streamerType": "auto",
"vast": {
"plugin": true,
"prerollUrl": url,
}
},
"entry_id": "1_k4eka7er",
/* ADD A READY CALLBACK AND GET A REFERENCE TO THE PLAYER
Add a ready callback to the player settings. This allows
us to get a reference to the player (stored in the
variable `kdp`) in order to interact with it later. */
readyCallback: function(playerId) {
console.log("Kaltura player " + playerId + " is ready.");
}
});
}
/* ACCOUNT FOR PAGE SPEED
If Prebid returned bids before the browser reached the end of
the page, the first version of `invokeVideoPlayer` will have
been called from `bidsBackHandler` so the winning VAST tag
will be stored in the `tempTag` variable.
If that's the case, we want to call the 'real' version of
`invokeVideoPlayer` with the stored URL to create the player
and play the ad.
If `tempTag` is not defined, that means the browser reached
the end of the page before the bids came back from Prebid,
meaning the 'real' version of `invokeVideoPlayer` was already
called. */
if (tempTag) {
invokeVideoPlayer(tempTag);
tempTag = false;
}
</script>