Add support for MPD Chaining

[wilaw]

ISO/IEC 23009-1:2014/ Amdendent 4 added definition for MPD Chaining. Chaining adds a new supplemental property to a manifest, instructing the player to load a new manifest once playback is complete. It is designed to allow simplified ad insertion capabilities, especially placing static ads as pre-rolls to live streams, which are otherwise complicated to achieve with multi-period manifests. It also allows for simplified player development, as manifests only ever contain a single period.

The DASH IF has created two test vectors which can be used for development

http://testassets.dashif.org/#feature/details/588a48c27459f8cb201b881b

[wilaw]

Deprioitizing this feature request pending additions to DASH IF IOP and MPEG DASH specs to improve useability for mid-roll ads.

[stale]

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[stale]

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