Adobe 65021048 User Guide - Page 431

Audio options for encoding, SurCode for Dolby Digital 5.1

Page 431 highlights

ADOBE PREMIERE PRO CS3 425 User Guide Encoding Passes Specifies the number of times the encoder will analyze the clip before encoding. Multiple passes increase the time it takes to encode the file, but generally result in more efficient compression and higher image quality. (Adobe After Effects doesn't support multiple encoding passes.) Target Bitrate Specifies the number of megabits per second of playback for the encoded file. Maximum Bitrate Specifies the maximum number of megabits per second of playback you want the encoder to allow. Minimum Bitrate Specifies the minimum number of megabits per second of playback you want the encoder to allow. The minimum bitrate differs according to the format. For MPEG-2-DVD, the minimum bitrate must be at least 1.5 Mbps. 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. 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. Audio options for encoding In the Export Settings dialog box, the options available in the Audio tab depend on the format you've specified. Some common audio options include the following: Codec Specifies the codec used to encode the audio: • AAC (Advanced Audio Coding) A high-quality encoding format supported by many mobile devices. This codec is the default for the H.264 format. • SurCode for Dolby Digital 5.1 A high-quality encoding format developed for multichannel digital sound and the most common encoder for DVD-video. (This codec is available only in Adobe Premiere Pro.) • MainConcept MPEG Audio A high-quality encoder developed by MainConcept media technologies, and included with Adobe Premiere Pro, After Effects, and Soundbooth. • PCM (pulse-code modulation) Audio A lossless audio format. Files of this format tend to be larger than files of the other formats. Audio Format Determines the audio type. Bit Rate Specifies the output bit rate of the audio. Generally, higher bit rates increase both quality and file size. This option is available for Dolby® Digital, MainConcept MPEG, and some Windows Media audio codecs. Note: Options not documented here are specific to the selected format. For detailed information, consult the specifications for the selected format. April 1, 2008

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ADOBE PREMIERE PRO CS3
User Guide
425
Encoding Passes
Specifies the number of times the encoder will analyze the clip before encoding. Multiple passes
increase the time it takes to encode the file, but generally result in more efficient compression and higher image
quality. (Adobe After Effects doesn’t support multiple encoding passes.)
Target Bitrate
Specifies the number of megabits per second of playback for the encoded file.
Maximum Bitrate
Specifies the maximum number of megabits per second of playback you want the encoder to
allow.
Minimum Bitrate
Specifies the minimum number of megabits per second of playback you want the encoder to
allow. The minimum bitrate differs according to the format. For MPEG-2-DVD, the minimum bitrate must be at
least 1.5
Mbps.
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.
Closed G
O
P 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 G
O
P 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.
Audio options for encoding
In the Export Settings dialog box, the options available in the Audio tab depend on the format you’ve specified.
Some common audio options include the following:
Codec
Specifies the codec used to encode the audio:
AAC (Advanced Audio Coding)
A high-quality encoding format supported by many mobile devices. This codec is
the default for the H.264 format.
SurCode for Dolby Digital 5.1
A high-quality encoding format developed for multichannel digital sound and the
most common encoder for DVD-video. (This codec is available only in Adobe Premiere Pro.)
MainConcept MPEG Audio
A high-quality encoder developed by MainConcept media technologies, and included
with Adobe Premiere Pro, After Effects, and Soundbooth.
PCM (pulse-code modulation) Audio
A lossless audio format. Files of this format tend to be larger than files of the
other formats.
Audio Format
Determines the audio type.
Bit Rate
Specifies the output bit rate of the audio. Generally, higher bit rates increase both quality and file size. This
option is available for Dolby® Digital, MainConcept MPEG, and some Windows Media audio codecs.
Note:
Options not documented here are specific to the selected format. For detailed information, consult the specifica-
tions for the selected format.
April 1, 2008