Abstract: In order to achieve peer-to-peer architectures for low cost video stream transmission and
real-time playback requirements, this paper proposes a distributed P2P video on demand scheduling
algorithm based on request drop neighborhood overlay. Firstly, this paper constructs technical index
of P2P VOD (video on demand) based on the superposition technique, considers the three parameters
optimization index of the input neighborhood nodes, the output neighborhood nodes and the media
server load, and then constructs the overlay structure and distributed algorithm flow. Secondly, this
paper uses the request descent strategy to improve the selection of the sending nodes and service
nodes, which can solve the problem of broadband low utilization ratio and invalid video playback.
Finally, experimental results based on the BitTorrent VOD system verify the effectiveness of the
proposed algorithm.

Key words: request drop, overlay selection, distributed, P2P video, on demand