This paper describes a no-reference temporal quality metric to model the impact of frame freezing impairments on perceived video quality. The proposed metric shows a high correlation with subjective data and is equally applicable to any type of objective video quality assessment model: full-reference, reduced-reference or no-reference. This temporal metric is a parameter of the video quality assessment algorithm in ITU-T Recommendation J.247 Annex C for the objective perceptual quality measurement of multimedia video.