Metrics
CPV (cost per view)
CPV is the cost paid per counted video view. Its meaning depends entirely on the platform's view definition - two seconds, six seconds, thirty seconds or completion - so CPV comparisons across platforms without normalising the definition are comparisons of different things.
In practice
For video campaigns, decide which view standard matters for the objective (often completed or 15-second-plus views for storytelling) and plan against that consistently.
Completion rate alongside CPV shows whether cheap views are cheap because the audience is engaged or because the count triggers early.