Performance evaluation of smoothing algorithms for transmitting prerecorded variable-bit-rate video

Abstract

The transfer of prerecorded, compressed variable-bit-rate video requires multimedia services to support large uctuations in bandwidth requirements on multiple time scales. Bandwidth smoothing techniques can reduce the burstiness of a variable-bit-rate stream by transmitting data at a series of xed rates, simplifying the allocation of resources in video servers and the communication network. This paper compares the transmission schedules generated by the various smoothing algorithms, based on a collection of metrics that relate directly to the server, network, and client resources necessary for the transmission, transport, and playback of prerecorded video. Using MPEG-1 and MJPEG video data and a range of client bu er sizes, we investigate the interplay between the performance metrics and the smoothing algorithms. The results highlight the unique strengths and weaknesses of each bandwidth smoothing algorithm, as well as the characteristics of a diverse set of video clips.

Smoothing transcoded MPEG-1 video streams for Internet transmission

“…Unlike the transmission of stored video [14], on-line source-based smoothing assumes no knowledge of future pictures beyond the current GOP, as is appropriate to video-casting applications, and to a greater extent for interactive applications such as teleconferencing. In [15], it is pointed out that most stored video algorithms assume a constant end-to-end delay through a packet-switched network, whereas end-to-end delay jitter is normal.…”

Transmission Optimization of Digital Compressed Video in Wireless Systems

“…Different types of smoothing algorithms have been implemented (Feng & Rexford, 1999). They are applied to stored video traffic, where all source video data are all available at server side and can be optimally scheduled "off-line".…”

<title>Proxy-Assisted Power-Friendly Streaming to Mobile Devices</title>

“…Consequently, smoothing can alleviate the problems in predicting packet arrival times of a VBR stream, since data is transmitted at a fixed rate within each piece-wise CBR segment. A number of smoothing algorithms have been proposed recently [7,11,16] and any such algorithm may be employed by the proxy. For the purpose of this paper, we assume a simple smoothing algorithm that smooths the stream data in each interval B and transmits it at a fixed rate within that interval.…”