Characterization of Video Traac
نویسنده
چکیده
ATM networks will carry a wide variety of data over the same packet switching network. A majority of this traac is expected to be real-time video generated by video on demand, video conferencing systems, etc. We study the characteristics of video data compressed using standard coding algorithms namely, JPEG, MPEG and also popular ones such as the video conferencing software NV. A wide range of video sources from movies to a class lecture were analyzed. Most of the traces were longer than an hour. The bit rate of the traces has been characterized using the leaky bucket model. We also show a method of choosing appropriate leaky bucket parameters. Burstiness function is used to characterize the burstiness of the video traac at diierent time scales. Our studies indicate that JPEG compressed has very little short term burstiness. MPEG and NV traac shows high burstiness over small time scales. JPEG and MPEG video exhibit burstiness over long time scales, whereas NV shows no burstiness over long time scales. It is found that for constant quality JPEG and MPEG compressed video, the leaky bucket parameters depend upon the contents of the video. For JPEG video, the service rate is mainly determined by the peak rate and for MPEG the service rate is given by the peak rate of the smoothed MPEG stream. However, the traac generated by NV can be characterized independent of the actual video. The target sending rate of the software NV determines the service rate for its traac.
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