Adobe Premiere Pro CS4 - Manual (Page 451)

445 USING ADOBE PREMIERE PRO CS4
Exporting
Last updated 11/6/2011
M Frames Specifies the number of B frames (Bi-directional frames) between consecutive I frames (Intra-frames) and
P frames (Predicted frames).
N Frames Specifies the number of frames between I frames (Intra-frames). This value must be a multiple of the M
frames value.
Optimize Stills or Expand Stills Select this option to use still images efficiently in exported video files. For example, if
a still image has a duration of 2 seconds in a project set to 30 fps, Adobe Premiere Pro creates one 2-second frame
instead of 60 frames at 1/30 of a second each. Selecting this option can save disk space for sequences and clips
containing still images. Deselect this option only if the exported video file exhibits playback problems when displaying
the still images.
Keyframe Interval [Seconds] or Key Frame Distance (Frames) Select and type the number of frames after which the
codec will create a keyframe when exporting video.
Simple Profile Available only when exporting in the FLV video format using the On2VP6 codec, selecting Simple
Profile optimizes high-resolution video content that will be played back on older computers or other devices with
limited memory and processing resources.
Undershoot [% target] Available only when exporting in the FLV video format using the On2VP6 codec, this option
lets you specify the percentage of the target data rate to shoot for so that additional data is available in the buffer to
improve difficult sections.
Quality Available only when exporting in the FLV format, this option lets you specify a balance between encoding
quality and the time it takes Adobe Premiere Pro to encode video.
• Good Strikes a balance between image quality and the amount of time it takes to encode video. This is the default
value.
• Best Creates the best possible image quality, but will take substantially longer to encode video.
• Speed Specifies that the video be encoded as fast as possible, however, the image will be of lower quality.
Recommended for video content used in testing deployments.
Closed GOP Every Specifies the frequency of each Closed Group of Pictures (Closed GOP), which cannot reference
frames outside of the closed GOP. A GOP consists of a sequence of I, B, and P frames. (This option is available if you
choose MPEG-1 or MPEG-2 as the format.)
Automatic GOP Placement When selected, sets the placement of Group of Pictures (GOP) automatically. (This option
is available if you choose MPEG-1 as the format.)
Note: MPEG-1 and MPEG-2 formats include numerous advanced options not listed here. In most cases, selecting a
format or preset designed for your target output sets the appropriate options automatically. For detailed information on
options not listed, consult the specifications for the MPEG-1 (ISO/IEC 11172) and MPEG-2 (ISO/IEC 13818) formats.
Multiplexer export settings
Multiplexer preset options control how After Effects and Adobe Premiere Pro merge MPEG video and audio data into
a single stream. The exact options available depend on the MPEG format you choose.
When you choose the MPEG-2 format, all Multiplexer options provided by the MPEG standard are available for
manual control. In most cases, it’s better to select an MPEG preset specifically targeted to your output medium (such
as MPEG-2
DVD).