4.2

Best: The slowest processing setting. Use for the most
complex motion and for interlaced source files. In general,
use the Best mode to maximize quality when using Single
Pass VBR (Best) or Two Pass VBR (Best).
GOP structure: This property is available only when the
“Frame rate” property is set manually (does not use
Automatic).
Compressor provides three methods of grouping frames, or
“pictures,” in encoded video: as I-frames (intra-frames), P-
frames (predictive frames), and B-frames (bidirectional
predictive frames). These are collectively called a Group of
Pictures (GOP). The “GOP structure” pop-up menu includes
several methods of arranging frames:
IP: Use IP only if your media contains fast motion that isn’t
encoded with sufficient quality using an IBBP or IBP
structure.
IBP: Use IBP only if your media contains fast motion that
isn’t encoded with sufficient quality using an IBBP
structure.
IBBP: Recommended for the majority of MPEG-2 encoding
situations.
Note: For most MPEG-2 encoding situations intended for use
on a DVD, choose IBBP as the GOP structure setting, and a
GOP size of 15 for NTSC, or 12 for PAL.
GOP size: This property is available when the “Frame rate”
property is set manually (does not use Automatic).
This slider specifies how many frames are contained within a
. The values available in the slider areGOP (group of pictures)