  The commercialization of Virtual Reality (VR) headsets has made immersive and
360-degree video streaming the subject of intense interest in the industry and
research communities. While the basic principles of video streaming are the
same, immersive video presents a set of specific challenges that need to be
addressed. In this survey, we present the latest developments in the relevant
literature on four of the most important ones: (i) omnidirectional video coding
and compression, (ii) subjective and objective Quality of Experience (QoE) and
the factors that can affect it, (iii) saliency measurement and Field of View
(FoV) prediction, and (iv) the adaptive streaming of immersive 360-degree
videos. The final objective of the survey is to provide an overview of the
research on all the elements of an immersive video streaming system, giving the
reader an understanding of their interplay and performance.
