On end-to-end architecture for transporting MPEG-4 video over the Internet

Abstract

Abstract| With the success of the Internet and exibility of MPEG-4, transporting MPEG-4 video over the Internet is expected to be an important component of many m ultimedia applications in the near future. Video applications typically have delay and loss requirements, which cannot be adequately supported by the current I n ternet. Thus, it is a challenging problem to design an e cient MPEG-4 video delivery system that can maximize the perceptual quality while achieving high resource utilization. This paper addresses this problem by presenting an end-to-end architecture for transporting MPEG-4 video over the Internet. We present a framework for transporting MPEG-4 video, which includes source rate adaptation, packetization, feedback control, and error control. The main contributions of this paper are: 1 a feedback control algorithm based on Real Time Protocol and Real Time Control Protocol RTP RTCP, 2 an adaptive source encoding algorithm for MPEG-4 video which is able to adjust the output rate of MPEG-4 video to the desired rate, and 3 an e cient and robust packetization algorithm for MPEG video bit-streams at the sync layer for Internet transport. Simulation results show that our end-to-end transport architecture achieves good perceptual picture quality for MPEG-4 video under low bit-rate and varying network conditions and e ciently utilizes network resources.

An Overview of Digital Video Compression for Mobile Health Systems

“…In interactive error control mechanisms, the decoder can inform the encoder about the channel error rate or even the location of lost blocks or macroblocks. If the channel error rate can be estimated, then the encoder target bitrate can either be increased or reduced to match the estimated error (Dapeng et al, 2000). Furthermore, if the decoder communicates the location of lost blocks and/or macroblocks to the encoder, the encoder may then keep track of which parts of the video are damaged.…”