Content-modification system with local avail correction feature

A non-transitory computer-readable storage medium, having stored thereon program instructions that, upon execution by a processor, cause performance of a set of operations comprising:

• detecting, over a particular time-period and at a periodic interval, match data indicating whether reference fingerprint data representing content transmitted by a non-local content-distribution system on a particular channel matches query fingerprint data representing content received by a content-presentation device on the particular channel;
• based on the detected match data, identifying, within the particular time-period:
• (i) a first time-period where there is threshold consistent fingerprint data matching occurring for a first threshold duration,
• (ii) a second time-period following the first time-period where (a) there is a threshold consistent lack of matching for a second threshold duration, and (b) the second time-period corresponds to a detected portion of the content received by the content-presentation device that serves as a placeholder for local content to be inserted by a local content-distribution system, and
• (iii) a third time-period following the second time-period where there is threshold consistent fingerprint data matching occurring for a third threshold duration;
• based on the identified first, second, and third time-periods, identifying that the local content-distribution system inserted local content into the content received on the particular channel in connection with the detected portion;
• and
• performing an action based on the detected insertion.

A computing system comprising:

• a processor;
• and
• a non-transitory computer-readable storage medium, having stored thereon program instructions that, upon execution by the processor, cause performance of a set of operations comprising:
• detecting, over a particular time-period and at a periodic interval, match data indicating whether reference fingerprint data representing content transmitted by a non-local content-distribution system on a particular channel matches query fingerprint data representing content received by a content-presentation device on the particular channel;
• based on the detected match data, identifying, within the particular time-period:
• (i) a first time-period where there is threshold consistent fingerprint data matching occurring for a first threshold duration,
• (ii) a second time-period following the first time-period where (a) there is a threshold consistent lack of matching for a second threshold duration, and (b) the second time-period corresponds to a detected portion of the content received by the content-presentation device that serves as a placeholder for local content to be inserted by a local content-distribution system, and
• (iii) a third time-period following the second time-period where there is threshold consistent fingerprint data matching occurring for a third threshold duration;
• based on the identified first, second, and third time-periods, detecting that the local content-distribution system inserted local content into the content received on the particular channel in connection with the detected portion;
• and
• performing an action based on the detected insertion.