1. In a multimedia processing device, a method comprising: identifying an interval in a multimedia stream as potentially representing a chapter break in a program represented by the multimedia stream; and characterizing the interval as representing an actual chapter break responsive to at least one variance in audio data of the multimedia stream between a point at a start of the interval and a point at an end of the interval, the at least one variance comprising at least one of: a variance in average bitrate of the audio data; and a variance in average highest frequency of the audio data.