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Accessing custom data in HLS Interstitials Asset List #2950
Description
Hello,
I am trying out HLS Interstitial ads using AWS MediaTailor.
(Reference: https://aws.amazon.com/ko/blogs/media/support-for-hls-interstitials-in-aws-elemental-mediatailor/)
When requesting the X-ASSET-LIST, the response from MediaTailor includes a custom JSON object called TRACKING that contains client-side ad tracking information, alongside the standard ASSETS array.
Example JSON Response:
{
"ASSETS": [
{
"DURATION": 14,
"URI": "https://segments.sample.mediatailor.aws.a2z.com/tm/.../asset.m3u8"
},
{
"DURATION": 14,
"URI": "https://segments.sample.mediatailor.aws.a2z.com/tm/.../asset.m3u8"
}
],
"TRACKING": {
"avails": [
{
"adBreakTrackingEvents": [],
"adMarkerDuration": null,
"ads": [
{
"adId": "4649886",
...
}
]
}
]
...
}
}I noticed that the current implementation ignores extra JSON objects outside the standard specification. I am looking for a way to process this custom data (like the TRACKING object) for client-side ad beaconing.
Could you let me know if there are any plans to support accessing such custom data in the future? Or is there any recommended approach to handle this?
Thank you.
Activity
marcbaechinger commentedon Dec 17, 2025
Thanks for your report.
Yeah, I was expecting the community to start using this. I'm not a fan of this approach of leveraging the JSON file as an extra transport channel for arbitrary data as this JSON file may be very much on the critical path for a good user experience. However, I'm not relevant.
Can you let me know how you access this data with AVPlayer? I think we should provide interoperability with the operating system of the spec owners, so if you can do that with AVPlayer we should deliver this as well.
If you can provide a pointer to what you can do on other platforms, we will provide parity.
hsahn-dev commentedon Dec 19, 2025
@marcbaechinger
Thank you for considering this request.
AVPlayerprovides access to the full Asset List response, including custom top-level objects likeTRACKING.The AVPlayerInterstitialEventMonitor is used to track interstitial events. Through this monitor, we can access the AVPlayerInterstitialEvent object, which exposes the raw JSON response via the assetListResponse property.
Since assetListResponse is returned as a Dictionary, it allows access to all fields, including custom data.
Thanks again.
Make raw JSON of asset list accessible
marcbaechinger commentedon Dec 30, 2025
The commit above adds the raw JSON response to the
Listener-API. Apps can receive the entire JSON response that way and use it for their purpose.I'm closing this issue. Please create a new issue if we can help any further in this regard.
Make raw JSON of asset list accessible
Make raw JSON of asset list accessible
Make raw JSON of asset list accessible
Make raw JSON of asset list accessible