A multimedia contents are distributed to peers and a contents peer which holds contents can provide other peers with the contents in peer-to-peer (P2P) overlay networks. Multimedia streaming is more significant than downloading ways in multimedia applications from security and economical reasons. We discuss distributed multi-source streaming models. Here, a collection of multiple contents peers in parallel transmit packets of a multimedia content to a leaf peer to realize the reliability and scalability. Even if not only some number of peers stop by fault and are degraded in performance but also some number of packets are lost and delayed, a leaf peer can receive a content at the required rate. We discuss how to allocate packets to each contents peer. We discuss a gossip-based, DAG-based coordination protocol (DCoP) to synchronize multiple contents peers. We evaluate DCoP in terms of how long it takes and how many messages are transmitted to synchronize multiple contents peers.