AWS Elemental MediaTailor
User Guide

Alternate Audio Expected Behavior

If your content contains alternate audio, MediaTailor transcodes audio-only renditions of the ads to the alternate audio tracks for your content. This way, audio switching continues to work during ad breaks. The service always inserts the default audio from the ad and replicates it across your audio tracks during ad breaks.

The audio sample rate must be from 16 to 320 kHz for ad transcoding to succeed.