Merging VCube, User Manual

Page: 248 / 291

Appendices : MPEG Settings (MainConcept Encoder) Page 248
Video Settings
This Tab enables settings to be made for Frame rate , Aspect ratio and GOP (Group of Pictures) structure. You can
also make various adjustments to the Bitrate :
Frame rate: Shows current Frame Rate. Will be unavailable for change if inappropriate due to choice
of Format Type in the Basic Settings Tab. Otherwise, offers a list of available Frame rates.
Deinterlacing Shows current deinterlacing status. Offers a choice of Enabled or Disabled
Aspect Ratio Shows current Aspect Ratio. Click to choose from:
Square Pels (pixels)
4 : 3 Display
16 : 9 Display
2.21 : 1 Display
Pulldown Shows current Pulldown parameters.
The parameters under Pulldown convert 23.976 fps (frames per second) to 29.97 fps, or 24 fps to 30 fps,This is
should only be done to progressive frame video (like film). The movie studios slow their films from 24 fps to 23.987
and then encode using Pulldown to display at 29.97 fps. The video encoder manipulates the Top Field First (tff )
and Repeat First Field (rff ) flags to convert 4 frames (8 fields) to 5 frames (10 fields) like this:
(T = top field, B = bottom field)
frame 1: tff = 1, rff = 0 fields displayed: TB frame 2: tff = 1, rff = 1 fields displayed: TBT
frame 3: tff = 0, rff = 0 fields displayed: BT frame 4: tff = 0, rff = 1 fields displayed: BTB