Cisco D9054 Installation And Operation Manual page 101

3:2 Pulldown and 3:2 Pulldown Inversion,
Encoder Behavior
The 3:2 pulldown detector of the D9054 HD Encoder detects if there is a distinctive
pattern of the 3:2 pulldown cadence, and controls the encoder actions, time
stamping, etc. The D9054 HD Encoder tracks the input material and goes
automatically and seamlessly in and out of 3:2 pulldown inversion, if the 3:2 PDI
feature has been enabled. No user intervention is therefore required for channels
with mixed film/video originated content.
Especially for low bit rates the 3:2 PDI feature provides a significant improvement
of the picture quality when encoding 1080i/29.97 Hz material that originates from
film. The improvement varies with the encoding rate, and the nature of the
material. Evidently, the overall benefit to your service depends on how often 3:2
pulldown material actually appears. In normal 1080i/29.97 Hz distribution
applications, it is recommended that you enable 3:2 PDI.
4038938 Rev A D9054 HDTV Encoder Intstallation and Operation Guide
Continued
5-17