3
Table Of Contents
- Compressor 3 User Manual
- Contents
- Welcome to Compressor
- Getting Started Quickly
- Ways to Use Compressor
- The Basic Transcoding Workflow
- The Compressor Interface
- Setting Compressor Preferences
- Importing Source Media Files
- Creating, Previewing, and Modifying Settings
- Finalizing Jobs and Submitting Batches
- Creating AIFF Files
- Creating Dolby Digital Professional Output Files
- About the Dolby Digital Professional Encoder Pane
- General Information About Creating Dolby Digital Professional Files
- Converting Stereo Audio Files to Dolby Digital Professional Format
- Assigning Files to Surround Sound Channels (Manual Method)
- Assigning Files to Surround Sound Channels (Automatic Methods)
- Assigning Files to Surround Sound Channels with Droplets
- Options for Spatial Mixing
- Creating DV Stream Output Files
- Creating H.264 for Apple Devices Output Files
- Creating H.264 for DVD Studio Pro Output Files
- Creating H.264 for Blu-ray Disc
- Creating Image Sequence Files
- Creating MP3 Output Files
- Creating MPEG-1 Output Files
- Common Uses for MPEG-1
- MPEG-1 Specifications
- About the MPEG-1 Encoder Pane
- About the MPEG-1 Video Tab
- About the MPEG-1 Audio Tab
- About System and Elementary Streams
- MPEG-1 Transcoding Workflow
- Configuring the MPEG-1 File Format for Web Use
- Configuring the MPEG-1 File Format for DVD Use
- Creating the MPEG-1 Video for DVD Setting
- Creating the MPEG-1 Audio for DVD Setting
- Optional—Creating an MPEG-1 for DVD Group and Destination
- Creating MPEG-2 Output Files
- Creating MPEG-4 Output Files
- About MPEG-4 Part 2
- About the MPEG-4 Part 2 Encoder Pane
- Using Default MPEG-4 Part 2 Settings
- Customizing MPEG-4 Part 2 Settings
- Audio Podcasting Workflow
- Stage 1: Configuring the MPEG-4 Output for Audio-Only Output
- Stage 2: Including Podcasting Information
- Stage 3: Applying the Setting to a Source Media File’s Target
- Stage 4: Entering Annotations for the Output Media File
- Stage 5: Creating and Configuring Markers for the Output Media File
- Stage 6: Submitting the Job and Verifying the Output Media File
- Adding Additional Settings and Presets
- Creating QuickTime Movie Output Files
- Creating QuickTime Export Component Files
- Adding Filters to a Setting
- Working with Frame Controls
- Adding Geometry Settings
- Adding Actions
- Using the Preview Window
- Creating and Changing Destinations
- Using Droplets
- Appendix A: Keyboard Shortcuts
- Appendix B: Solving Problems
- Resources for Solving Problems
- Solutions to Common Problems
- Exporting from Final Cut Pro and Distributed Processing
- QuickTime Reference Movies
- Cluster Settings for Extended Transcoding Sessions
- Cleaning Up Cluster Storage
- Using Apple Qmaster with an NFS Server
- Apple Qmaster Distributed Processing and Xsan
- Compressor Command-Line Usage Requires Login
- Create Blu-ray Disc Job Action
- Contacting AppleCare Support
- Appendix C: Using the Command Line
- Installing Apple Qmaster from the Command Line
- Using the Command Line for Distributed Processing
- Using Scripts to Run Apple Qmaster, Compressor, and Batch Monitor
About 24p (23.98p)
For DVD authoring and encoding, 24p refers to a video sequence that contains 24
progressive (non-interlaced) frames per second, with NTSC-related standard definition
frame dimensions (720 x 480 for MPEG-2). Film-based movies have a native frame rate of
24 fps, and because the MPEG-2 format is able to represent 24 fps video internally, many
commercial movie DVDs are encoded in this way. But any time you use NTSC video in
your project, the frame rate of film-transferred material will be slowed down from 24 fps
to 23.976 fps (rounded to 23.98) and a 2:3:2:3 pull-down is added. So, the more accurate
term is actually 23.98p.
Compressor can also do this for 24p source video files. For such material, the 23.98 frame
rate option (in the Video Format tab) compresses each source frame one-for-one, without
compressing repeated frames or fields in order to achieve a 29.97 fps display rate. This
results in higher quality at a lower compressed bit rate than would be possible if the 24p
material were converted to 29.97 fps prior to transcoding. Compressor also sets internal
MPEG-2 frame flags correctly, so DVD players will properly apply the 3:2 pull-down process
for display on 29.97 fps interlaced NTSC TV sets.
Note: If your source video has a frame rate of 24.00 fps rather than 23.98 fps, Compressor
skips one out of every 1000 source frames. If the 24p source video is 23.98 fps, Compressor
transcodes all source frames, without skipping (or repeating) any of them.
MPEG-2 Transcoding Workflow
This section includes step-by-step instructions for setting your MPEG-2 attributes prior
to creating MPEG-2 output files with Compressor. Make your MPEG-2 settings from the
MPEG-2 Encoder pane by either modifying an existing setting or creating a new one in
the Settings tab.
See the following steps for working with the MPEG-2 output file format. For example
values for each of these settings, see Example MPEG-2 Settings.
• Stage 1: Choosing Video Format Settings
• Stage 2: Choosing Quality Settings
• Stage 3: Choosing GOP Settings
• Stage 4: Choosing Extras Settings
Stage 1: Choosing Video Format Settings
It’s important to match the video format, aspect ratio, and field dominance to those of
your source media file. See Video Format Tab for a more detailed description of each of
these settings.
213Chapter 18 Creating MPEG-2 Output Files