  Neural Radiance Fields (NeRFs) excel in photorealistically rendering static
scenes. However, rendering dynamic, long-duration radiance fields on ubiquitous
devices remains challenging, due to data storage and computational constraints.
In this paper, we introduce VideoRF, the first approach to enable real-time
streaming and rendering of dynamic radiance fields on mobile platforms. At the
core is a serialized 2D feature image stream representing the 4D radiance field
all in one. We introduce a tailored training scheme directly applied to this 2D
domain to impose the temporal and spatial redundancy of the feature image
stream. By leveraging the redundancy, we show that the feature image stream can
be efficiently compressed by 2D video codecs, which allows us to exploit video
hardware accelerators to achieve real-time decoding. On the other hand, based
on the feature image stream, we propose a novel rendering pipeline for VideoRF,
which has specialized space mappings to query radiance properties efficiently.
Paired with a deferred shading model, VideoRF has the capability of real-time
rendering on mobile devices thanks to its efficiency. We have developed a
real-time interactive player that enables online streaming and rendering of
dynamic scenes, offering a seamless and immersive free-viewpoint experience
across a range of devices, from desktops to mobile phones.
