About the mpeg-1 encoder pane – Apple Compressor 3 User Manual
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• GOP length: 15 frames for NTSC; 12 frames for PAL
These settings are fixed and apply to all Compressor MPEG-1 video output files. See
for information about Group of Pictures (GOP) settings. See
for information
on the encoding mode.
The MPEG-1 output files can have I-frames forced on specific frames by placing
compression markers on them. These markers can be added to the source media file
using Final Cut Pro or can be added manually in the Preview window. See
for more information.
The MPEG-1 format does not support named chapter markers.
About the MPEG-1 Encoder Pane
This section contains detailed information about the various tabs within the MPEG-1
Encoder pane of the Inspector window. You make your MPEG-1 settings using these tabs,
by either modifying an existing setting or creating a new setting in the Settings tab.
The MPEG-1 Encoder pane opens with the default Video tab on top and contains the
following items.
• Extension: This field displays the MPEG-1 file extension (.mpg) automatically after the
MPEG-1 output format is selected from the File Format pop-up menu, or the (+) pop-up
menu in the Settings tab. The extension changes to the video-only extension (.m1v) if
the Audio tab is disabled, or audio-only extension (.m1a) if the Video tab is disabled.
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Chapter 17
Creating MPEG-1 Output Files