Amazon Ad Server will be sunset in Q4 2024, please visit this page (AAS offboarding information) for offboarding support resources and sunset FAQs. Details shared on that page represent the most up to date information in the Help Center, if you find disparate information in other resources please default to the information in the AAS offboarding information page accordingly.



Amazon Ad Server (AAS) supports the following file types for audio assets:

  • MP3: This is the most universally-supported audio file format across browsers, and the recommended format.

  • OGG (OGG audio)


Note: You should treat .oga files as .ogg files.

When trafficking them, in-stream audio ads will be attached to in-stream video placements.

Setting up a single ad

Setting up your ad requires that you start by uploading your audio file to the Assets library. Then, set up your ad based on the audio file that you uploaded.

Upload your ad

  1. Select Creative > Assets Library.

  2. Click New Folder to create a folder into which you will upload your audio file.

  3. Click Upload.

  4. Perform one of the following actions if the ad is a VPAID:

    • Drag your zipped Workspace in the new window.

    • Click Browse Files to locate the Workspace.

  5. Perform one of the following actions if the ad is not a VPAID:

    • Drag your audio file in the new window.

    • Click Browse Files to locate the audio file.

  6. Click Done.

Set up your ad in-stream ad

  1. Select Creative > Ads.

  2. Click New Ad > Blank Ad.

  3. Give your ad a meaningful name.

  4. In the Ad Format list, select:

    1. In-Stream Video to set up your ad as a VAST

    2. in-stream audio to set up your ad as a DAAST

  5. In the Creative Assets > Linear tab:

    1. Click Add.

    2. Select the folder and navigate to an uploaded audio file.

    3. Under Settings, confirm that the linear duration matches the specifications you received from the publisher.

  6. Click Save.

Loading modes

You can set your in-stream ad to serve in one of these loading modes:

  • Instant: The entire unit loads immediately. This is the default behavior.

  • Polite: A lightweight image loads first. The full ad loads after the publisher's page finishes loading.

For more information about polite loading, see Add Polite Load to your HTML ads.

Previewing and testing

After you finish creating your ad, make sure that you preview and test it. For more information, see Preview Your Ads and Test your ads.


Note: Not all file formats are supported on all browsers and devices. You should always build In-Stream ads with the specs required by the publisher, but in some cases some of the assets may not be previewed properly in your browser.

Adding variants

If your publisher requires multiple audio files for a single instream ad or multiple file formats (for example .mp3 and .ogg), click Add Variant and navigate to other audio files.


Note: When using variants, make sure the content of your audio is the same across files. They should also share the same duration. If you have different contents and/or durations, you should build multiple In-Stream ads, and not a single one with multiple audios.

Adding a companion


Note: With instream ads, companion ads will only work if the publisher supports this format. Companions will not show in AAS preview feature. To ensure that the ad displays properly, request a test page from your publisher.

The companion element is an optional asset that appears alongside the video player on the same page, such as a .jpg image. The ad typically starts with the linear element (in case of multiple linear elements, then with the one that starts first) and can either remain on the page throughout the entire video play, change at some point with another creative, or disappear.

There are two types of companions:

  • Static Resource Companion: This companion is also known as a static resource type. For example, a single asset, like an image (.jpg, .png, or .gif).

  • HTML/iFrame Resource Companion: This companion will be selected from available display ads that are assigned to the same campaign. This selection can be made from the In-Stream ad's settings at the placement ad level.

Working with the settings tab

Changing duration

You can voluntarily chose to adjust the linear duration. This will override the duration of your file, and the in-stream ad will stop at the duration you manually defined in this field.

Linear click-through

You can add a URL in this field to test your ad.

Delivery type

This option determines how the video is delivered:

  • Progressive: Buffers the video content prior to playing the ad. This is the default and recommended option.

  • Streaming: Plays the ad in real-time using the streaming technology.


Note: When the delivery type is Streaming, the RTMP protocol is used to serve the media file. You should confirm that the publisher's player supports streaming media through this protocol. In addition, external restrictions such as corporate firewalls and network restrictions may prevent media from playing.

Options not available for DAAST


Note: Although available in AAS, the following options should not be activated for in-stream audio.

  • Activating auto transcoding

  • Viewability and verification

  • Scale options

  • Skip button

  • Settings for VAST 4 and later


Note: If you need one of these options for your audio ad, use the VAST format, which can also deliver audio ads.

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