Automatic gain control (AGC) is a technique found in many electronic devices. The average or peak output signal level is used to adjust the gain to a suitable level, enabling the circuit to work satisfactorily with a greater range of input signal levels. For example, without AGC the sound emitted from an AM radio receiver would vary to an extreme extent from a weak to a strong signal; the AGC effectively reduces the volume if the signal is strong and raises it when it is weaker.
Why the AGC filter is needed for Flash+Wowza application?
Flash Player does not support AGC feature natively.
WZ-AGC is a server-side AGC filter for Wowza Media Server.
You can install WZ-AGC and add AGC filter to your Wowza application.