NPR

How are downloads measured in the new Audio Downloads report?

Download measurement occurs by retrieving the access logs left by users who access an audio file on your CDN. The access logs are parsed into a database. NPR then uses the audio file itself to determine the minimum amount of each file required to be counted as a download. This minimum download threshold is computed as the equivalent of 1 minute of audio plus the size of the ID3 tag.

Then we sum up all the bytes transmitted across one or multiple requests for that file from the same user (as identified through the unique combination of user agent and IP address). If the total bytes transmitted for that user’s request exceeds the minimum download threshold, then we count that as a real download.  

We also filter out bots and known scrapers from the requests in order to measure real users. What’s left over is only qualified downloads according to IAB’s measurement standards.

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