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The IMA SDK must be able to tell when ads are visible to users so that it can
send the correct signals back to the ad server. IMA uses
Active View reporting
to measure the viewability of ads. This guide explains how Active View
reporting works with IMA, as well as how to verify that the SDK is able to
correctly capture viewability signals.
The publisher passes the IMAAdDisplayContainer to the
IMAAdsRequest
constructor.
Active View receives measurements on the view.
Verifying that the SDK can measure ad viewability
To check whether that the SDK is able to capture viewability signals, look for
network requests sent to https://pagead2.googlesyndication.com/pcs/activeview
and check for the mtos parameter. For more information, see
Monitor Active View measurement.
The following sample stream is available for viewability testing:
CMS ID: "2556080", video ID: "tears-of-steel-omid"
To test using this stream, first check the network logs for
ima-test-verification.js to be downloaded and then a ping fired to
https://pagead2.googlesyndication.com/pagead/gen_204 at the start of ad
playback.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-20 UTC."],[[["\u003cp\u003eThe IMA SDK leverages Active View reporting to determine ad visibility and send corresponding signals to the ad server, ensuring accurate measurement of ad impressions.\u003c/p\u003e\n"],["\u003cp\u003ePublishers need to initialize the \u003ccode\u003eIMAAdDisplayContainer\u003c/code\u003e with a view and include it in the \u003ccode\u003eIMAAdsRequest\u003c/code\u003e for Active View to receive viewability measurements.\u003c/p\u003e\n"],["\u003cp\u003eAd viewability measurement can be verified by monitoring HTTP requests for \u003ccode\u003eactive_view_vide_measurable_impression\u003c/code\u003e and the \u003ccode\u003emtos\u003c/code\u003e parameter, or using the provided sample stream for testing purposes.\u003c/p\u003e\n"],["\u003cp\u003ePublishers using custom video displays should ensure their layouts allow for correct viewability metrics and can refer to the IMA support forum for assistance if needed.\u003c/p\u003e\n"]]],[],null,[]]
