---
title: interstitials
framework: tvmljs
role: symbol
role_heading: Instance Property
path: tvmljs/mediaitem/1627341-interstitials
---

# interstitials

An array of interstitial objects.

## Declaration

```data
attribute Array interstitials;
```

## Discussion

Discussion An interstitial object defines a point within a MediaItem object where you can insert another media item; for example, a short ad. Each interstitial object in the array contains two keys: starttime and duration. The starttime is the length of time from the beginning of a media item, in seconds. The duration is the length of the interstitial, in seconds. Both keys are required. A common use for these objects is to define when and where ads are to be played during a stream. Listing 1 shows a complete TVMLKit JS example for incorporating interstitials. A single interstitial is defined. In addition, an event listener is created that prevents users from fast-forwarding or rewinding during the duration of the interstitial. var baseURL;   App.onLaunch = function(options) {     baseURL = options.BASEURL;     var documentPath = "path to file on server/baseball.m3u8";     var videourl = baseURL + documentPath;       var singleVideo = new MediaItem('video', videourl);     var videoInterstitials = [];     videoInterstitials.push({         starttime: 30,         duration: 20     });     singleVideo.interstitials = videoInterstitials;     var videoList = new Playlist();     videoList.push(singleVideo);     var myPlayer = new Player();     myPlayer.playlist = videoList;     myPlayer.addEventListener("requestSeekToTime", function(event) {         if (event.currentTime > 30 && event.currentTime <50) {return false;} else {return true;}         });     myPlayer.play(); }   App.onExit = function() {     console.log("exited"); }

## See Also

### Setting Timing Options

- [highlightGroups](tvmljs/mediaitem/1627413-highlightgroups.md)
- [resumeTime](tvmljs/mediaitem/1627400-resumetime.md)