Advanced Video Codec.

High Definition.

High (bandwidth) Digital Content Protection.

Hard Disk Drive.

High-Level Data Link Control.

High Definition Multimedia Interface.

High Dynamic Range.

Highly Elliptical Orbit.

High Efficiency Streaming Protocol - an adaptive HTTP based streaming protocol which offers a lower cost tot he media company, and a relatively low lend to end atency of around 400ms.

High Efficiency Video Coding.

Hybrid Log Gamma.

HTTP Live Streaming (protocol) - developed by Apple Inc.

Hierarchical Storage Management.

Hyper Text Markup Language.

Head Related Transfer Function.