Exfo EXpert IPTV Test Tools (FTB-1 / 2 Pro) Instrukcja Użytkownika Pobierz pdf (Strona 45)

Appendix A

The IPTV Video Stream is subjected to multilevel analysis as shown here:

A.1 Understanding IPTV Video Perceptual Quality *

The perceptual quality of video transmitted across IPTV networks is susceptible to

degradation from a number of transmission network sources including, frame errors caused

by packet loss, discard of packets due to excessive delay/jitter, and discard of packets due to

arrival sequencing errors. Simply relying on packet loss statistics, however, is not an accurate

way to measure video quality as perceived by viewers. The same degree of packet loss may

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