Use of in-band data to correct schedule drift

A computing system comprising:

• at least one processor;
• at least one non-transitory data storage;
• and
• program instructions stored in the at least one non-transitory data storage and executable by the at least one processor to carry out operations including:
• determining a time offset based at least on a difference between (i) a time of occurrence of a content event in a media stream as indicated by data carried in-band with the media stream and (ii) a time of occurrence of the content event in the media stream as indicated by schedule data that is not carried in-band with the media stream,
• applying the determined time offset as a basis to adjust a scheduled time of an advertisement in the media stream, so as to establish an adjusted scheduled time of the advertisement in the media stream, and
• using the adjusted scheduled time of the advertisement in the media stream as a basis to control when to monitor for presence of a replacement advertisement in the media stream.

At least one non-transitory computer-readable medium embodying program instructions executable by at least one processor to carry out operations comprising:

• determining a time offset based at least on a difference between (i) a time of occurrence of a content event in a media stream as indicated by data carried in-band with the media stream and (ii) a time of occurrence of the content event in the media stream as indicated by schedule data that is not carried in-band with the media stream;
• applying the determined time offset as a basis to adjust a scheduled time of an advertisement in the media stream, so as to establish an adjusted scheduled time of the advertisement in the media stream;
• and
• using the adjusted scheduled time of the advertisement in the media stream as a basis to control when to monitor for presence of a replacement advertisement in the media stream.