  This paper provides an overview of the Omnidirectional Media Format (OMAF)
standard, second edition, which has been recently finalized. OMAF specifies the
media format for coding, storage, delivery, and rendering of omnidirectional
media, including video, audio, images, and timed text. Additionally, OMAF
supports multiple viewpoints corresponding to omnidirectional cameras and
overlay images or video rendered over the omnidirectional background image or
video. Many examples of usage scenarios for multiple viewpoints and overlays
are described in the paper. OMAF provides a toolbox of features, which can be
selectively used in virtual reality services. Consequently, the paper presents
the interoperability points specified in the OMAF standard, which enable
signaling which OMAF features are in use or required to be supported in
implementations. Finally, the paper summarizes which OMAF interoperability
points have been taken into use in virtual reality service specifications by
the 3rd Generation Partnership Project (3GPP) and the Virtual Reality Industry
Forum (VRIF).
