Starting today, AWS Elemental MediaTailor now supports HLS Interstitials for video-on-demand (VOD) streams. This feature, which you can enable as an option, automatically conditions manifests so ad break pods are decoupled from the main content stream. By separating the ad content from the main video stream, HLS Interstitials provides more efficient ad payload delivery reducing video start-up time when compared to traditional Server-Side Ad Insertion and reduced buffering or errors during ad breaks compared to Client-Side Ad Insertion.
Source:: Amazon AWS