public void setSurroundExMode(String surroundExMode) {
        this.surroundExMode = surroundExMode;
    }
When encoding 3/2 audio, sets whether an extra center back surround channel is matrix encoded into the left and
right surround channels.

@param surroundExMode
       When encoding 3/2 audio, sets whether an extra center back surround channel is matrix encoded into the
       left and right surround channels.
@see Eac3SurroundExMode
aws-java-sdk-medialive/src/main/java/com/amazonaws/services/medialive/model/Eac3Settings.java