VBR video: Tradeoffs and potentials

In this paper we examine the transport and storage of video compressed with a variable bit rate (VBR). We focus primarily on networked video, although we also briefly consider other applications of VER video, including satellite transmission (channel sharing), playback of stored video, and wireless transport. Packet video research requires careful integration between the network and the video systems; however, a major stumbling block has resulted because commonly used terms are often interpreted differently by the video and networking communities. This paper, then, has two main goals: i) to clarify the definitions of terms that are often used with different meaning by networking and video-coding researchers and ii) to explore the tradeoffs entailed by each of the various modalities of VER transmission (unconstrained shaped constrained, and feedback). In particular, we evaluate the tradeoff among the advantages (better video quality, less delay and more calls) that were identified by early proponents of VBR video transmission. An underlying theme of this paper is that increased interaction between the video and network design has potential for improving overall decoded video quality without changing the network capacity.