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After [adding ads](🔗) to your content, you can define ad rules that control how often a viewer sees ads while watching your video content.

• If you are publishing playlists that consist of short-duration videos, like tutorials or product reviews, you can define `startOn` (the first playlist item allowing ad playback) and `frequency` (the regularity of ads within a playlist).

• If you are publishing long-form content, like webinars or interviews, you can define `startOnSeek` (which determines if a returning visitor is served a pre-roll before resuming content playback) and `timeBetweenAds` (which sets the minimum time that must elapse between ads playback).

• If you want to prevent ads from playing when the player is on an inactive tab, you can add `deferAds: {}` which prevents ad playback when the player's browser tab is inactive and plays the last deferred ad break when the player's browser tab is active again.

You can read the [Ad rules reference](🔗) to learn more about how each ad rule impacts a user's experience.

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• When using a VAST (`vast`) ad client, you can define any of the four `advertising.rules` properties.

• When using an IMA (`googima`) or a FreeWheel (`freewheel`) ad client, you can only define `startOn` and `frequency`.

• When using Google's Dynamic Ad Insertion (`dai`) ad client, **none** of the `advertising.rules` properties are applicable.

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## Implementation

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If you are using a cloud-hosted player, you can define the ad rules for an [ad schedule](🔗) in your JWP dashboard and associate the ad schedule with your cloud-hosted player. The ad schedule will play in every instance of the embedded player.

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Use the following steps and code samples to define ad rules for an [embedded player](🔗) with an [ad schedule](🔗):

1. Add a [rules](🔗) object within the `advertising` object.

2. Configure the properties of the `rules` object for your use case.

You can build upon this basic implementation by [setting up Player Bidding](🔗).

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## Examples

### Example 1: Short-form content

The following example illustrates a short-form media item with a pre-roll. The first ad plays before the first playlist item (`startOn: 1`). Then, subsequent pre-rolls appear for every third playlist item (`frequency: 3`), starting with the fourth playlist item.

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### Example 2: Long-form content

The following example illustrates a long-form media item with multiple ad breaks. The `startOnSeek` and `timeBetweenAds` (set to 300 seconds) ad rules have been defined.

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### Example 3: Long-form content with deferred ad playback

The following example illustrates a long-form media item with multiple ad breaks. The `deferAds{}` and `timeBetweenAds` (set to 300 seconds) ad rules have been defined.

For this example, assume the video is 60 minutes and a viewer takes the following actions:

• Starts this video from the beginning

• Opens a new tab when the video time is `00:10:00:000`

• Returns to the video when the video time is `00:42:10:000`

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Based on the code example, the viewer would view the following ads:

• The pre-roll (`offset: "pre"`) and first mid-roll (`offset: 300`) ads before opening a new tab

• The fourth mid-roll ad (`offset: "50%"`) when she returns to the player's browser tab at `00:42:10:000`

• The post-roll ad

The second and third mid-roll ads would not be played due to the `deferAds{}` rule. The last mid-roll would not be played due to `timeBetweenAds`.

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