This page covers the Chapter offset reporting dimension. See Chapter offset for how to collect this variable.
The Chapter offset dimension reports the offset of each chapter inside the content, measured in seconds from the start.
How this dimension is populated
Chapter offset is set by the player on every chapter start event.
a.media.chapter.offset to an eVar.evar1-evar250, post_evar1-post_evar250 (the eVar that your processing rule maps a.media.chapter.offset to)c_contextdata.a.media.chapter.offsetClassification approach
Adobe creates the Chapter offset classification structure automatically when Media Chapters is enabled for the report suite. You are responsible for populating and maintaining the classification using Classification sets.
This approach provides a guaranteed 1:1 relationship between each chapter ID and its offset. Classification updates apply retroactively across all historical data for that ID.
Processing rule approach
Create a Processing rule that maps a.media.chapter.offset to an eVar. This approach captures the chapter offset as a per-hit value without requiring classification maintenance.
The trade-off is that you lose the guaranteed 1:1 relationship between the chapter offset and the parent Chapter dimension. If your implementation sends inconsistent values for the same chapter ID across events, multiple offsets can appear under the same chapter. Updating a value only applies to data moving forward.
Dimension items
Each item is the integer offset value, in seconds, reported on chapter start.