Cisco D9054 Installation And Operation Manual page 99

Setting Up the H.264 Video Encoder,
9. Type the Number of B-Pictures.
The number of B pictures must be 0, 1, 2, 3, 7 or 15.
For I-Frames only (i.e., IIII..) set GOP Length = 1 and Number of B-pictures = 0.
For IPIP..., set GOP Length = 2, Number of B-Pictures = 0.
For IPPIPP..., set GOP Length = 3, Number of B-Pictures = 0.
For typical MPEG-like GOP (i.e., IBBP...) set GOP Length = 15, Number of B-
Pictures = 2.
10. Set the 3:2 Pulldown Inversion (abbreviated 3:2 PDI) to On if you are going to
encode 1080i/29.97 Hz material.
This improves the picture quality when encoding 1080i/29.97 Hz material that
originates from film.
Turn off the 3:2 PDI in the following instances:
Situation
Your decoders are not fully MPEG-
2 compliant.
You need to encode all frames
The 3:2 PDI feature is only applicable for the 1080i/29.97 Hz format.
Note: Enabling 3:2 PDI increases the delay by 1 frame.
Important: Do not enable or disable 3:2 PDI during live operation. The D9054
HD Encoder restarts if you enable or disable 3:2 PDI.
11. Click Apply.
4038938 Rev A D9054 HDTV Encoder Intstallation and Operation Guide
Continued
Reason
The decoders may not accept information
on picture repetition and cannot
regenerate a correct video sequence.
3:2 PDI removes some of the frames and
this means that you cannot provide full
picture-to-picture transparency from the
video input to the Transport Stream.
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