Apple Compressor 2 Manual de usuario Pagina 142
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142 Chapter 10 Creating MPEG-2 Output Files
By definition, closed GOPs cannot contain any frame that refers to a frame in the
previous GOP. In contrast, open GOPs begin with one or more B-frames that reference
the last P-frame of the previous GOP. Closed GOPs created by Compressor always begin
with an I-frame.
Open GOPs generally provide slightly better compression than do closed GOPs of the
same structure and size. The illustration above shows that a closed GOP contains one
more P-frame than does an open GOP of the same length. Since P-frames generally
require more bits than do B-frames, the open GOP achieves slightly better
compression.
There are limitations to using open GOPs for DVD-Video discs that are created using a
DVD authoring application such as DVD Studio Pro. One limitation is that only closed
GOPs are permitted within MPEG-2 streams that will be used for mixed-angle or
multi-angle DVDs.
The other limitation is that DVD chapter markers can only be set at the beginning of a
closed GOP. The best time to define chapter markers is before doing MPEG-2
transcoding. For example, if you specify your chapter markers in Final Cut Pro, you can
set Compressor to do MPEG-2 transcoding with open GOPs. Compressor will then force
a closed GOP to begin only at the specified chapter markers, and will make all other
GOPs open. You can also accomplish this by specifying “forced I-frames” in the
Compressor Preview window, and giving them a chapter name to be used by
DVD Studio Pro.
However, if you want to specify chapter markers at any GOP boundary after your video
has been transcoded in the MPEG-2 format, you should only use closed GOPs. This
freedom is limited, as it allows you to set chapter markers only at GOP boundaries,
rather than at any video frame.
- Compressor 2 1
- User Manual 1
- Contents 3
- An Introduction to Compressor 7
- 8 Preface 8
- Typical Compressor Scenarios 9
- Compressor Features 10
- Apple Websites 14
- Getting Started Quickly 17
- Edit batch name here 18
- Setting pop-up menu 18
- Batch table 18
- All source media files 20
- Submitting a Batch 24
- 25 25
- Compressor Concepts and Terms 28
- Choosing an Output Format 29
- Creating a Compressor Batch 31
- Viewing Transcoding Status 33
- Optional Compressor Shortcuts 33
- The Compressor Interface 37
- Preview window 38
- Batch window 38
- Inspector window 38
- Presets window 38
- Batch Window 39
- Presets Window 40
- Destinations Tab 41
- Inspector Window 42
- Encoder Pane 43
- Frame Controls Pane 45
- Filters Pane 46
- Geometry Pane 47
- Actions Pane 48
- History Drawer 49
- Preview Window 50
- Batch Monitor 51
- Droplet Windows 52
- Importing Source Media Files 55
- Import Surround 56
- Group button 56
- Import File button 56
- Batch Name field 58
- Creating, Previewing 61
- About the Settings Tab 62
- Setting group with 64
- New “Untitled” setting 64
- About the Inspector 65
- Creating a Setting 68
- Modifying a Setting 70
- Previewing a Setting 72
- Make adjustments while 73
- The Preview window 73
- Creating Groups of Settings 75
- Creating Jobs 77
- Setting pop-up icon with 78
- Batch Name field with 78
- Click the disclosure 80
- Submit button 80
- Destination 81
- Select the settings to 81
- About the History Drawer 84
- Resubmitting a Batch 85
- Unique file identifiers are 90
- Creating Dolby Digital 93
- Professional 93
- Audio Tab Settings 95
- Bitstream Tab Settings 97
- Preprocessing Tab Settings 98
- Surround Channels 99
- Professional Format 100
- Creating Surround Files 101
- (Automatic Methods) 104
- Options for Spatial Mixing 106
- Accommodating Stereo Playback 107
- 109 109
- About the H.264 Encoder Pane 110
- Job Segmenting and Multi-pass 112
- H.264 Workflows for DVD 113
- Creating MPEG-1 Output Files 115
- MPEG-1 Specifications 116
- About the MPEG-1 Encoder Pane 117
- Video Tab 118
- Audio Tab 119
- System Streams 120
- Elementary Streams 120
- MPEG-1 Transcoding Workflow 121
- Deselect to disable the 125
- Video tab 125
- The file extension changes 125
- Creating MPEG-2 Output Files 127
- HD on DVD 128
- About the MPEG-2 Encoder Pane 129
- Video Format Tab 130
- About 24p (23.98p) 133
- Quality Tab 134
- Extras Tab 143
- MPEG-2 Transcoding Workflow 145
- Mode pop-up menu 147
- Motion Estimation 147
- Bit rate calculator 147
- GOP Structure 149
- Closed button 149
- GOP Size 149
- Working With MPEG-2 I-Frames 150
- Creating MPEG-4 Output Files 153
- About the MPEG-4 Encoder Pane 154
- Video Pane 155
- Audio Pane 156
- Streaming Pane 157
- Either enter a number in the 160
- Creating QuickTime Movie 163
- Output Files 163
- Summary table 164
- File Extension field 164
- Options button (dimmed) 164
- Streaming 164
- Compression type 167
- Options button 167
- Frames per second field 167
- Keyframe 168
- Delta frames 168
- Rate field and 169
- Choosing an Audio Codec 170
- Choose a video codec 172
- Choose an audio codec from 173
- Understanding Codecs 174
- QuickTime Video Codecs 174
- QuickTime Audio Codecs 175
- Sound Sampling Rates 176
- Sound Sampling Size 176
- Creating QuickTime Export 177
- File Format 178
- Options 178
- Configure settings for 179
- Creating AIFF Output Files 180
- Format pop-up 181
- Configuring AIFF Settings 182
- Creating TIFF Output Files 183
- Configuring TIFF Settings 184
- Adding Filters to a Setting 185
- Deinterlacing 186
- Removing Video Noise 187
- Color Spaces 187
- About the Filters Pane 188
- Working With Frame Controls 195
- About the Frame Controls Pane 196
- About the Geometry Pane 201
- About the Actions Pane 205
- Adding Actions 206
- Using the Preview Window 209
- About the Preview Window 210
- Playhead timecode 213
- Playhead 213
- In point 213
- Out point 213
- Previewing a Clip 215
- Adding Markers to a Clip 220
- A blue marker appears 221
- Enter a chapter 222
- Creating and Changing 223
- Destinations 223
- About the Destinations Tab 224
- Creating a Destination 226
- Filename Template 227
- Host Name is required 228
- File Path is required 228
- Warning Triangles 230
- Remove button 231
- Duplicate button 231
- Template field 233
- Using Droplets 235
- About the Droplet Window 236
- Creating a Droplet 238
- Show at Launch 239
- Customer Support 243
- Calling AppleCare Support 244
- Command-Line Usage 245
- Command options 249
- 251 251
- 252 Index 252
- Index 253 253
- 254 Index 254
- Index 255 255
- 256 Index 256
- Index 257 257
- 258 Index 258
- Index 259 259
- 260 Index 260
- Index 261 261
- 262 Index 262
- Index 263 263
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