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What is Video Completion Rate?

Video completion rate is the proportion of qualifying playback starts that reach the end or a defined completion threshold. Meaningful comparisons require a consistent denominator and threshold.

How Video Completion Rate works

Completion is an analytics event derived from a playback session, not a property stored in the media file. An implementation joins starts, progress signals, seeks, ends, and session identifiers, then applies rules for eligibility and terminal progress. The metric can be computed per viewer, session, impression, or play, and those denominators answer different questions. It belongs in the measurement layer after player instrumentation and before reporting or experimentation.

Key facts

  1. A player’s end event can follow a seek directly to the final seconds, so event occurrence alone does not prove that the viewer watched the intervening content.
  2. Short assets generally accumulate completions more easily than long ones; duration cohorts or watched-percentage distributions provide essential context for comparison.
  3. Retries, multiple tabs, and duplicated client beacons can inflate both starts and completions unless events carry stable session identifiers and are deduplicated server-side.

When Video Completion Rate matters

Compare completion rates only after standardizing what counts as a start and a completion. Autoplay, short videos, seeking, and repeated sessions can otherwise distort conclusions about viewer interest.

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