Based on common naming conventions in niche media circles, the terms likely refer to the following: sifangds (四方) / sifangds 2
This paper proposes SifangDS 2 MP4 Exclusive, a lightweight protocol and system architecture for reliable, low-latency delivery of MP4 video segments in edge-assisted networks. We present the protocol design, caching strategies, segment packaging, adaptation logic, and an experimental evaluation comparing throughput, startup delay, and stalling against DASH over HTTP/2. Results show SifangDS 2 reduces startup delay by ~25% and rebuffering by ~30% under constrained bandwidth scenarios. sifangds 2 mp4 exclusive