Demonstration of Viewport-Aware Hybrid Broadcast-Unicast Streaming for Volumetric Video

Real-time streaming of volumetric video requires low latency and high bandwidth, making it hard to scale efficiently with unicast delivery alone. This work presents a multi-path transport framework that combines broadcast and unicast to enable scalable, bandwidth-efficient delivery of interactive volumetric content. A base layer is transmitted via broadcast using File Delivery over Unidirectional Transport, while enhancement layers are fetched on demand via Dynamic Adaptive Streaming over HTTP based on the viewer’s viewport. The approach reduces redundant transmissions and enables fine-grained adaptation without compromising interactivity. An end-to-end implementation is demonstrated with real-time viewport tracking, dynamic quality switching, and live monitoring under varying bandwidth constraints, improving reliability, achieving sub-40 ms latency and reducing per-client unicast load by $18 \mathrm{Mbps}(15 \%)$ per object at the highest quality.