Dynamic Adaptive Streaming over HTTP (DASH), also known as MPEG-DASH, is an adaptive bitrate live streaming video protocol that enables high quality streaming of video content.
Ad Manager supports DASH for both video on demand and live linear streams . This includes the following features that are detailed in the ISO DASH standard :
- ISO-BMFF On Demand profile and ISO-BMFF Live profile
- Support for Widevine and Playready through MPEG-DASH Common Encryption (CENC)
- Subtitle support for WebVTT and TTML (in-band and out-of-band in the Media Presentation Description for DASH (MPD)
- Closed caption support with "CEA608/708"
Digital Right Management (DRM)
DASH provides support for Digital Right Management (DRM) , which allows you to deliver premium streaming content with protections against unauthorized access or theft.
If DRM is enabled, the MPD must contain the <ContentProtection>
element and follow the syntax defined in the DASH spec. Optimally, the PSSH (parallel-SSH) box content should be present in the manifest.
Widevine example
<ContentProtection
schemeIdUri="urn:uuid:EDEF8BA9-79D6-4ACE-A3C8-27DCD51D21ED">
<cenc:pssh>BASE64_PSSH</cenc:pssh>
</ContentProtection>
