This page covers the Chapter position reporting dimension. See Chapter position for how to collect this variable.
The Chapter position dimension reports the index of each chapter inside the content.
How this dimension is populated
Chapter position is set by the player on every chapter start event.
a.media.chapter.position to an eVar.evar1-evar250, post_evar1-post_evar250 (the eVar that your processing rule maps a.media.chapter.position to)c_contextdata.a.media.chapter.positionClassification approach
Adobe creates the Chapter position 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 position. Classification updates apply retroactively across all historical data for that ID.
Processing rule approach
Create a Processing rule that maps a.media.chapter.position to an eVar. This approach captures the chapter position as a per-hit value without requiring classification maintenance.
The trade-off is that you lose the guaranteed 1:1 relationship between the chapter position and the parent Chapter dimension. If your implementation sends inconsistent values for the same chapter ID across events, multiple positions can appear under the same chapter. Updating a value only applies to data moving forward.
Dimension items
Each item is the integer position value reported on chapter start.