This paper presents a novel video service system DCSVS (distributed collaborative set-top-box video service), which encompasses several practical and effective solutions to both live and VoD (video-on-demand) services. DCSVS is established on an overlay DHT (distributed hash table) network, which improves Kademlia protocol to fit for real-time application. We use several types of pre-fetching to enhance continuity rate of VoD service, and we employ an effective scheduling algorithm based on transferring priorities. We design the inner-first and proxy-forward strategy to relieve transferring failure, and we use Window-based storage and hashing to achieve better system performance. Both theoretical analysis and experimental results show that strategies in DCSVS perform well in terms of efficiency and robustness, and could maintain a fine state and scalability in large-scale networking.