TABLE OF CONTENTS Users who deploy video transport systems often need to select equipment for compressing video and audio signals. Because of the wide variety of applications, it would be very difficult to describe one product that can fit all (or even most) needs. Plus, video compression technology is constantly evolving, and comparisons made at any one point in time can quickly go out of date. Instead of attempting to make comparisons of the various technologies, in the following sections we will discuss how the comparisons can be made and which aspects of compression are important to various applications.
For many users, video quality is the most important criterion for selecting a video compression system. The level of quality required for a system to support medical diagnoses is far different from that needed for simple chats between co-workers in a videoconference. However, some guidelines listed in Table 4-10 can be used when making these comparisons.
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