Adobe 22030000 User Guide - Page 59

Preset options for audio, View a preset’s parameters, Bitrate, Encoding Passes, Target Bitrate

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ENCORE CS3 55 User Guide data rate. Variable bit rate (VBR) compresses data to fit between a fixed minimum and fixed maximum rate. VBR allows the compression to vary, which can result in better quality than CBR. Bitrate Specifies the number of Mbps you want the encoded file to have. Only appears if you select CBR as the Bitrate Encoding option. The following options appear only if you select VBR as the Bitrate Encoding option: Encoding Passes Specifies the number of times the encoder will analyze the clip before encoding. Enabled for VBR only. Target Bitrate Specifies the number of Mbps you want the encoded file to have. For VBR, the target provides an average bit rate. (See "Calculate a bit budget" on page 29.) Maximum Bitrate Used with VBR only. Specifies the maximum number of Mbps you want the encoder to allow. The maximum allowable rate is 40.0 Mbps for Blu-ray Disc assets and 9.0 Mbps for DVD assets, providing a safety margin. Minimum Bitrate Used with VBR only. Specifies the minimum number of Mbps you want the encoder to allow. The minimum bit rate must be at least 0.192 Mbps for Blu-ray Disc assets and 1.5 Mbps for DVD assets. M frames Specifies the number of B frames between consecutive I and P frames. N frames Specifies the number of frames between I frames. This value must be a multiple of the M frames value. Preset options for audio The Audio tab of the Project Transcode Presets dialog box contains the following options, depending on the codec chosen: Audio format Specifies the codec the encoder uses to compress the audio: Note: NTSC discs must contain either PCM Audio or Dolby® Digital; they cannot contain only MPEG audio. This restriction does not apply to PAL discs. • Dolby® Digital is a high-quality encoding format developed for multi-channel digital sound and the most common encoder for DVD-video. Encore encodes Dolby® Digital 2.0 (stereo) audio files. • MainConcept MPEG Audio uses MPEG-1 Layer II audio in stereo. • PCM (Pulse-Code Modulation) Audio is a lossless audio format sampled at 48 kHz in Encore. Files of this format tend to be large, occupying more disc space than the other encoder formats. Note: MPEG Audio is not available for Blu-ray MPEG-2 or H.264. Bitrate Specifies the output bit rate of the audio. This option is only available for Dolby® Digital and MainConcept MPEG Audio codecs. View a preset's parameters 1 Choose File > Edit Quality Presets. 2 In the Export Settings section, choose a preset from the Preset menu and view its properties listed under Summary. Click OK to close the dialog box. Note: The estimated file size per second is displayed at the bottom of the dialog box. If you change a preset's parameter that affects file size, such as target bit rate, the estimate updates to reflect your change.

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ENCORE CS3
User Guide
55
data rate. Variable bit rate (VBR) compresses data to fit between a fixed minimum and fixed maximum rate. VBR
allows the compression to vary, which can result in better quality than CBR.
Bitrate
Specifies the number of Mbps you want the encoded file to have. Only appears if you select CBR as the Bitrate
Encoding option.
The following options appear only if you select VBR as the Bitrate Encoding option:
Encoding Passes
Specifies the number of times the encoder will analyze the clip before encoding. Enabled for VBR
only.
Target Bitrate
Specifies the number of Mbps you want the encoded file to have. For VBR, the target provides an
average bit rate. (See “Calculate a bit budget” on page 29.)
Maximum Bitrate
Used with VBR only. Specifies the maximum number of Mbps you want the encoder to allow. The
maximum allowable rate is 40.0 Mbps for Blu-ray Disc assets and 9.0 Mbps for DVD assets, providing a safety
margin.
Minimum Bitrate
Used with VBR only. Specifies the minimum number of Mbps you want the encoder to allow. The
minimum bit rate must be at least 0.192 Mbps for Blu-ray Disc assets and 1.5 Mbps for DVD assets.
M frames
Specifies the number of B frames between consecutive I and P frames.
N
frames
Specifies the number of frames between I frames. This value must be a multiple of the M frames value.
Preset options for audio
The Audio tab of the Project Transcode Presets dialog box contains the following options, depending on the codec
chosen:
Audio format
Specifies the codec the encoder uses to compress the audio:
Note:
NTSC discs must contain either PCM Audio or Dolby® Digital; they cannot contain only MPEG audio. This
restriction does not apply to PAL discs.
•
Dolby® Digital is a high-quality encoding format developed for multi-channel digital sound and the most common
encoder for DVD-video. Encore encodes Dolby® Digital 2.0 (stereo) audio files.
•
MainConcept MPEG Audio uses MPEG-1 Layer II audio in stereo.
•
PCM (Pulse-Code Modulation) Audio is a lossless audio format sampled at 48 kHz in Encore. Files of this format
tend to be large, occupying more disc space than the other encoder formats.
Note:
MPEG Audio is not available for Blu-ray MPEG-2 or H.264.
Bitrate
Specifies the output bit rate of the audio. This option is only available for Dolby® Digital and MainConcept
MPEG Audio codecs.
View a preset’s parameters
1
Choose File > Edit Quality Presets.
2
In the Export Settings section, choose a preset from the Preset menu and view its properties listed under
Summary. Click OK to close the dialog box.
Note:
The estimated file size per second is displayed at the bottom of the dialog box. If you change a preset’s parameter
that affects file size, such as target bit rate, the estimate updates to reflect your change.