Difference between revisions of "EAC Compression Options"

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m (Waveform: removed what I had added about renaming mp3-in-a-wav files, since decoded mp3s (e.g. with lame --decode) sometimes have the same style of filename. WAV spec already in external links)
(Correcting 1.0b2 command-line parameter; a few small edits that I hope improve clarity; adding some useful links.)
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In the '''compression options dialog''' in [[EAC]] (shortcut: F11) all options can be found regarding the compression of music files. Here EAC's behavior when clicking on the ''MP3'' Button in the main window or items in the ''Action'' menu (and then starting a ''compressed'' action) are specified.
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In [[Exact Audio Copy]]’s '''compression options''' dialog (keyboard shortcut: F11) are found all options regarding the creating of [http://en.wikipedia.org/wiki/Audio_compression_(data) compressed audio files]. Here the user specifies how EAC is to behave when they press the ''MP3'' Button in the main window or select ''compressed'' items under the ''Action'' menu.
 
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Note that many options are dependent on the codec or external compressor (encoder). So often no clear recommendation can be given. It is just important that you understand what these settings do and how they possibly change the behavior of EAC and/or the codec/external compressor.
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<small>''Used EAC version: 1.0 beta 2''</small>
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Note: many options are dependent on the codec or external compressor (encoder). So, often no clear recommendation can be given. It is important that the user has a general understanding of what these settings do and how they possibly change the behavior of EAC and/or the [[codec]]/external compressor.
  
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This article was recently updated to reflect changes introduced in EAC v1.0b2; however, the instructions for prior versions were retained for reference.
  
 
=Waveform=
 
=Waveform=
 
[[Image:EAC_Compression_options_Waveform.png|thumb|right|Example settings '''compression options''', '''Waveform''' tab]]
 
[[Image:EAC_Compression_options_Waveform.png|thumb|right|Example settings '''compression options''', '''Waveform''' tab]]
This tab allows you to select and choose the options for an internal codec. After audio data is read from the CD, EAC will pass it to the codec, and will write the codec's output to a file. Generally speaking, EAC's internal codec support is for writing unusual WAV files, although the options do allow for writing other formats.
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This tab allows you to select and choose the options for an internal [[codec]]. After audio data is read from the CD, EAC will pass it to the codec, and will write the codec's output to a file. Generally speaking, EAC’s internal codec support is for writing unusual [[WAV]] files (e.g. containing audio in the [[Adaptive Differential Pulse Code Modulation|ADPCM]] format or as a rare way of storing [[MP3]] data), although the options do allow for writing other formats.
  
All options are greyed out here if ''Use external program for compression'' in the ''External Compression'' tab is ticked. When you're using an external compressor, you can't use an internal codec.
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An internal codec is a [[Constant Bitrate|CBR]] (constant bit rate) audio converter library managed through the Windows Audio Compression Manager (ACM) legacy interface, and it typically has a filename ending in <code>.acm</code>. Windows comes with a few such codecs installed already. These aren’t programs you run directly; they’re just converters invoked from within another program, e.g. EAC.
  
An internal codec is a [[Constant Bitrate|CBR]] (constant bit rate) audio converter library managed through the Windows Audio Compression Manager (ACM) legacy interface, and it typically has a filename ending in <code>.acm</code>. Windows comes a few such codecs installed already. These aren't programs you run directly; they're just converters invoked from within another program, like EAC.
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All options are greyed out here if ''Use external program for compression'' in the ''External Compression'' tab is ticked. When using an external compressor, you of course cannot use an internal codec.
  
Today, most people ripping music CDs don't use internal codecs; they use an external compressor, which is configured in the ''External Compression'' tab. An external compressor is a separate program that can be run directly from a command shell with various arguments telling it what file to compress, what tags to add, the output filename, etc.
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Today, most people ripping music CDs don't use internal codecs; they use an external compressor, which is configured in the ''External Compression'' tab. An external compressor is a separate program that can be run directly from a command shell with various arguments telling it which file to compress, what tags to add, the output filename, etc.
  
  
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With this option, different combinations of parameters for the compression and output format can be chosen, such as sample rate, resolution, mono/stereo. Which options are available here depends on the codec selected at the ''Wave format'' option (e.g. some codecs only support 4 bit resolution).
 
With this option, different combinations of parameters for the compression and output format can be chosen, such as sample rate, resolution, mono/stereo. Which options are available here depends on the codec selected at the ''Wave format'' option (e.g. some codecs only support 4 bit resolution).
  
If you were to choose ''Microsoft PCM Converter'' as the codec, and ''44,100 Hz, 16 Bit, Stereo'' as the output format, it would be the same as doing an uncompressed rip.
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If you were to choose ''Microsoft PCM Converter'' as the codec, and ''44,100 Hz, 16 Bit, Stereo'' as the output format, it would be the same as doing an [http://en.wikipedia.org/wiki/Red_Book_(CD_standard) uncompressed CD rip].
  
  
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Some formats (e.g. [[MP3]]) support [[ID3|ID3 tags]]. When this option is enabled, EAC will add these tags to the compressed files (only if the file format supports ID3 tags).
 
Some formats (e.g. [[MP3]]) support [[ID3|ID3 tags]]. When this option is enabled, EAC will add these tags to the compressed files (only if the file format supports ID3 tags).
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: '''Do not write WAV header to file'''
 
: '''Do not write WAV header to file'''
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The codec only converts the audio data. EAC writes it to a file. This parameter determines whether to include a WAV header in the file.
 
The codec only converts the audio data. EAC writes it to a file. This parameter determines whether to include a WAV header in the file.
  
Although it has become a ''de facto'' standard that WAV files contain 16-bit, 44.1 kHz stereo PCM audio data (just like what's on a CD), what actually makes an audio file a WAV is not the format of the audio data itself, but the presence of a WAV header at the beginning of the file. The header says what data chunks are in the file (normally there's just a single chunk consisting of all the audio), info about what format it's in, and possibly some other rudimentary metadata. When such a header is present, EAC will ensure the output filename ends with <code>.wav</code>.
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Although it has become a ''de facto'' standard that WAV files contain 16 bit, 44.1 kHz stereo PCM audio data (as on audio CDs), what actually makes an audio file a WAV file is not the format of the audio data itself but the presence of a WAV header at its beginning. The header specifies which data chunk(s) are in the file (normally there's just a single chunk consisting of all the audio), info about what format it’s in, and possibly some other rudimentary metadata. When such a header is present, EAC will ensure the output filename ends with <code>.wav</code>.
  
 
If you have chosen a codec that outputs PCM data, then you probably ''do'' want a WAV header and filename ending in <code>.wav</code>, so this option should be enabled. But if you have chosen a codec that outputs MP3 or Ogg Vorbis data, then the WAV header is optional, and in fact is probably not what you want, unless you have a specific need to put the compressed audio into a WAV file.
 
If you have chosen a codec that outputs PCM data, then you probably ''do'' want a WAV header and filename ending in <code>.wav</code>, so this option should be enabled. But if you have chosen a codec that outputs MP3 or Ogg Vorbis data, then the WAV header is optional, and in fact is probably not what you want, unless you have a specific need to put the compressed audio into a WAV file.
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Some codecs support a quality setting to choose between a higher quality of the output files or faster encoding speed. If quality is the only matter, leave this option at the default, which is ''High quality (slow)''.
 
Some codecs support a quality setting to choose between a higher quality of the output files or faster encoding speed. If quality is the only matter, leave this option at the default, which is ''High quality (slow)''.
  
EAC offers this choice of quality settings even if the selected codec doesn't use it.
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When using a ''User defined encoder'', you can demarcate any portion of your custom command line as being for low- (delimit the chosen parameters with ''%l'') and high-quality (similar but with ''%h'') modes only and use this option to choose between the two.
  
=External Compression=
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Note: EAC offers this choice of quality settings even if the selected codec doesn't use it.
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=External compression=
 
[[Image:EAC_Compression_options_External_Compression.png|thumb|right|Recommended settings EAC '''compression options''', '''External Compression''' tab]]
 
[[Image:EAC_Compression_options_External_Compression.png|thumb|right|Recommended settings EAC '''compression options''', '''External Compression''' tab]]
In this tab, all options for external compressors can be configured. As all settings are highly dependent on the particular compressor, most settings are only described here because often no clear recommendations can be given.
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In this tab, all options for external compressors can be configured. As all settings are highly dependent on the particular compressor, most settings are only described here in general terms because often no specific recommendations can be given; but see the many [[:Category:EAC Guides|EAC guides]] (also linked below) written by Hydrogenaudio users for in-depth advice on topics including configuring various external encoders.
 
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'''''General recommendation:''''' To avoid unwanted side effects and to be able to configure the encoding process in every detail, ''User Defined Encoder'' should be used as ''Parameter passing scheme'' and all options should be specified via the ''Additional command-line options'' only.
 
'''''General recommendation:''''' To avoid unwanted side effects and to be able to configure the encoding process in every detail, ''User Defined Encoder'' should be used as ''Parameter passing scheme'' and all options should be specified via the ''Additional command-line options'' only.
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"Side effects" basically means that it is a little complex what options have which effect when another ''Parameter passing scheme'' is specified (e.g. some settings are ignored completely). These side effects are explained in the following parameters, but specifying ''User Defined Encoder'' and using the command-line options only is a lot more convenient.
 
"Side effects" basically means that it is a little complex what options have which effect when another ''Parameter passing scheme'' is specified (e.g. some settings are ignored completely). These side effects are explained in the following parameters, but specifying ''User Defined Encoder'' and using the command-line options only is a lot more convenient.
  
 
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As mentioned above, there are also a few articles with details about how to configure EAC to use particular encoders:
There are also a few articles with details about how to configure EAC to use particular encoders:
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* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_FLAC EAC and FLAC]
 
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_FLAC EAC and FLAC]
 
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_Lame EAC and LAME]
 
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_Lame EAC and LAME]
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_Monkey%27s_Audio EAC and Monkey's Audio]
 
 
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_AAC EAC and Nero AAC]  
 
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_AAC EAC and Nero AAC]  
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_Musepack EAC and Musepack]
 
 
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_Ogg_Vorbis EAC and OGG Vorbis]
 
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_Ogg_Vorbis EAC and OGG Vorbis]
 
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_WavPack EAC and WavPack]
 
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_WavPack EAC and WavPack]
* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_TAK EAC and TAK]
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* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_Monkey%27s_Audio EAC and Monkey's Audio]
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* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_Musepack EAC and Musepack]
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* [http://wiki.hydrogenaudio.org/index.php?title=EAC_and_TAK EAC and] [[TAK]]
  
  
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:: ''(Default: disabled, '''Recommended: enabled''')''
 
:: ''(Default: disabled, '''Recommended: enabled''')''
  
To use an external compressor, this setting has to be enabled. Otherwise all the options in this tab are greyed out.
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To use an external compressor, this setting has to be enabled; otherwise, all the options here are greyed out.
  
  
 
: '''Parameter passing scheme'''
 
: '''Parameter passing scheme'''
  
EAC comes with a few presets concerning external compressors and the required parameter passing scheme which can be selected with this option (e.g. the ''Bit rate'' box will show all available options after a particular compressor was chosen here). But in general, the capabilities of EAC in passing parameters to external compressors are limited. In order to overcome some of these limitations you can use the ''Additional command-line options'' for additional parameter passing. The usual approach is setting the ''Parameter passing scheme'' to ''User Defined Encoder'' and using the ''Additional command-line options'' to specify all the encoding options.
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EAC comes with a few presets concerning external compressors and the required parameter passing scheme; they can be selected with this option (e.g. the ''Bit rate'' box will show all available options after a particular compressor was chosen here). But in general, the capabilities of EAC in passing parameters to external compressors are limited. In order to overcome some of these limitations, you can and should use the ''Additional command-line options'' for to pass parameters. The usual approach is setting the ''Parameter passing scheme'' to ''User Defined Encoder'' and using the ''Additional command-line options'' to specify all the encoding options.
  
  
 
: '''Use file extension'''
 
: '''Use file extension'''
  
When chosen the entry ''User Defined Encoder'' on the setting ''Parameter passing scheme'', a file extension has to be specified here. This should be the extension of the encoded file type (e.g. ".flac" when using a [http://wiki.hydrogenaudio.org/index.php?title=Flac FLAC] encoder).
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When using a ''User Defined Encoder'' as above, a file extension must be specified here. This should be the extension of the encoded file type (e.g. ''.flac'' when using a [[FLAC]] encoder and ''mp3'' when encoding to [[MP3]]).
  
  
 
: '''Program, including path, used for compression'''
 
: '''Program, including path, used for compression'''
  
The absolute path to the program used for compression. This may be an .exe or a .dll file (e.g. "C:\Program Files\LAME\lame.exe"). By clicking on the ''Browse...'' button, this path can be chosen by a file dialog.
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The absolute path to the program used for compression. This may be an .exe or a .dll file (e.g. ''C:\Program Files\[[LAME]]\lame.exe''). By clicking on the ''Browse...'' button, this path can be chosen by a file dialog.
  
  
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|}
 
|}
  
So an exemplary EAC 1.0b2 or newer command-line could look like this ([[LAME]]):
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So, an exemplary EAC 1.0b2 or newer command-line for the [[LAME]] MP3 encoder could look like this :
<pre>-V 0 --vbr-new --ta "%artist%" --tt "%title%" --tl "%albumtitle%" --tg "%genre%" --ty "%year%" --tn "%tracknr" --tc "%comment%" %source% %dest%</pre>
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<pre>-V 0 --vbr-new --ta "%artist%" --tt "%title%" --tl "%albumtitle%" --tg "%genre%" --ty "%year%" --tn "%tracknr%" --tc "%comment%" %source% %dest%</pre>
  
As you can see, the command-line options of LAME (e.g. <code>-V 0</code>, <code>--ta</code>, <code>--tt</code>, etc.) are used in conjunction with the EAC placeholders (e.g. <code>%artist%</code>, <code>%title%</code>, etc.) to control LAME only by this command-line.
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As you can see, the command-line options of LAME (e.g. <code>-V 0</code>, <code>--ta</code>, <code>--tt</code>, etc.) are used in conjunction with the EAC placeholders (e.g. <code>%artist%</code>, <code>%title%</code>, etc.) to control LAME using this command-line.
  
 
{| class="wikitable"
 
{| class="wikitable"
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|}
 
|}
  
So an exemplary EAC 1.0b1 or earlier command-line could look like this ([[LAME]]):
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So, an exemplary EAC 1.0b1 or earlier command-line for the [[LAME]] MP3 encoder could look like this:
 
<pre>-V 0 --vbr-new --ta "%a" --tt "%t" --tl "%g" --tg "%m" --ty "%y" --tn "%n" --tc "%e" %s %d</pre>
 
<pre>-V 0 --vbr-new --ta "%a" --tt "%t" --tl "%g" --tg "%m" --ty "%y" --tn "%n" --tc "%e" %s %d</pre>
  
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What is shown in this drop-down box depends on the ''Parameter passing scheme'' selected and specifies the bit rate/quality settings of the external compressor.  This setting is also used to calculate the approximate size of the compressed tracks shown in EAC's main window.
 
What is shown in this drop-down box depends on the ''Parameter passing scheme'' selected and specifies the bit rate/quality settings of the external compressor.  This setting is also used to calculate the approximate size of the compressed tracks shown in EAC's main window.
  
In the case that ''User Defined Encoder'' is selected as the ''Parameter passing scheme'' this setting does not have an effect unless the <code>%r</code> parameter is specified in the ''Additional command-line options''.
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In the case that ''User Defined Encoder'' is selected as the ''Parameter passing scheme'', this setting does not have an effect unless the <code>%r</code> parameter is specified in the ''Additional command-line options''.
  
  
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Many encoders offer the choice between better quality or faster encoding speed. This option is designated to choose between these two settings, but the precise behavior depends on what is selected on the ''Parameter passing scheme'':
 
Many encoders offer the choice between better quality or faster encoding speed. This option is designated to choose between these two settings, but the precise behavior depends on what is selected on the ''Parameter passing scheme'':
  
If ''User Defined Encoder'' is chosen, this option does not have an effect unless the <code>%h...%h</code> and <code>%l...%l</code> parameters are used in the ''Additional command-line options'' (see below). When any other ''Parameter passing scheme'' is used, this setting is reflected on the particular encoder. When using LAME for instance, ''High quality'' corresponds to the <code>-h</code> switch, whereas ''Low quality'' uses the <code>-f</code> switch (in this case, these switches specify the "Noise shaping and psycho acoustic algorithms", means choice between quality and encoding speed).
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If ''User Defined Encoder'' is chosen, this option does not have an effect unless the <code>%h…%h</code> and <code>%l…%l</code> parameters are used in the ''Additional command-line options'' (see below).
So when you opt for the best possible quality when using another ''Parameter passing scheme'' then ''User Defined Encoder'', make sure ''High quality'' is selected.
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As already mentioned above, with this setting it is also possible to configure the ''Additional command-line option'' even further: With the placeholders <code>%h...%h</code> and <code>%l...%l</code> you can specify two different settings for the external compressor which can be controlled by this option. The following example (simplified) shows how to use this feature (again with LAME):
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When any other ''Parameter passing scheme'' is used, this setting is reflected on the particular encoder. When using LAME for instance, ''High quality'' corresponds to the <code>-h</code> switch, whereas ''Low quality'' uses the <code>-f</code> switch (in this case, these switches specify the "Noise shaping and psycho acoustic algorithms", means choice between quality and encoding speed). This is another reason that it is advisable to use a completely custom ''User defined encoder''; but if you ''do'' use another scheme, you will probably want to ensure that ''High quality'' is selected.
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As already mentioned above, with this setting it is also possible to configure the ''Additional command-line option'' even further: by delimiting chosen portions of your command line with the placeholders <code>%h</code> and <code>%l</code>, you can specify two alternate settings for the external compressor to use depending on this option. The following example (simplified) shows how to use this feature (again with LAME):
  
 
<pre>%h-V0%h%l-V5%l --vbr-new %s %d</pre>
 
<pre>%h-V0%h%l-V5%l --vbr-new %s %d</pre>
  
In this case, if the ''High quality'' option is chosen, then then LAME will encode with <code>-V 0</code>, otherwise with <code>-V 5</code> when ''Low quality'' is selected.
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In this case, if the ''High quality'' option is chosen, LAME will encode with <code>-V0</code>; whereas it will encode at <code>-V5</code> when ''Low quality'' is selected.
  
  
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: '''Add ID3 tag'''
 
: '''Add ID3 tag'''
  
When this option is enabled, EAC writes ID3 tags to the compressed files.  Make sure only to use this setting with mp3 files.  Formats such as flac, TAK, WavPack, Monkey's Audio and Ogg Vorbis were not intended to use ID3 tags and adding such tags may cause problems.
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When this option is enabled, EAC writes [[ID3]] tags to the compressed files.  Make sure only to use this setting with mp3 files.  Formats such as flac, TAK, WavPack, Monkey's Audio and Ogg Vorbis were not intended to use ID3 tags and adding such tags may cause problems.
  
Another possibility to include ID3 tagging is to use the external compressor itself to tag the resulting files. This would be done via the ''Additional command-line options''. But note that when this option is enabled, these tagging instructions via command-line do not have any effect, because EAC just overrides the tags written by the encoder.
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Another possibility to include ID3 tagging is to use the external compressor itself to tag the resulting files. This would be done via the ''Additional command-line options''. Indeed, it is recommended to use this where available, as seen in the above example command lines for LAME. (If this option is enabled ''and'' tagging instructions are included in the command line, the latter have no effect because EAC immediately overwrites the tags written by the encoder.
  
  
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:: ''(Default: disabled, '''Recommended: enabled''')''
 
:: ''(Default: disabled, '''Recommended: enabled''')''
  
When this setting is enabled, EAC checks the return code of an external compressor. When the external compressor returns an error code (e.g. because of a wrong command-line parameter was used), EAC shows this error message in a dialog box. So it is recommended to enable this option to notice any errors the encoder returns.
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When this setting is enabled, EAC checks the return code of an external compressor. When the external compressor returns an error code (e.g. because of a wrong command-line parameter was used), EAC shows this error message in a dialog box. So, it’s recommended to enable this option in order to diagnose any errors.
  
 
=Offset=
 
=Offset=
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This tab offers options regarding offset correction during encoding/decoding and the ID3 tag comment field.
 
This tab offers options regarding offset correction during encoding/decoding and the ID3 tag comment field.
  
Note: The offset mentioned here has nothing to do with a drive offset and therefore should not be mistaken.
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Note: The offset mentioned here has nothing to do with a [[Exact Audio Copy#Offset technology|drive offset]] and therefore should not be mistaken for the latter. In addition, most popular encoders now have their own built-in compensation for encoding offsets, and certain decoders can use this to eliminate any unwanted gaps; in such cases, these options are unnecessary.
  
  
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:: ''(Default: disabled, '''Recommended: disabled''')''
 
:: ''(Default: disabled, '''Recommended: disabled''')''
  
Some encoders will have an offset when encoding. This means that at the beginning of a track they often add some silence, whereas a few samples could be missing at the end. When decoding again, this could result in some unwanted gaps. This options offers now the opportunity to correct this encoding/decoding offset so that the original file can be reconstructed (at least concerning correct beginning/end of a track; with [[Lossy|lossy]] formats the original file can not be reconstructed completely). The point behind this option is that is possible that there is such an offset between the codec which is used for encoding (the actual codec) and the other one used for decoding (default installed codec). An example would be using LAME for MP3 encoding and the Fraunhofer codec for decoding. In this case, this option would be useful.
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Some encoders will have an offset when encoding. This means that at the beginning of a track they often add some silence, whereas a few samples could be missing at the end. When decoding again, this could result in some unwanted gaps. This options offers now the opportunity to correct this encoding/decoding offset so that the original file can be reconstructed (at least concerning correct beginning/end of a track; with [[Lossy|lossy]] formats the original file can not be reconstructed completely). The point behind this option is that is possible that there is such an offset between the codec which is used for encoding (the actual codec) and the other one used for decoding (default installed codec). An example would be using [[LAME]] for MP3 encoding and the Fraunhofer codec for decoding. In this case, this option would be useful.
  
So when you decode your encoded files and experience some unwanted gaps in the decoded files, then you should try to enable this option and configure it accordingly (see below). In all other cases, leave this option disabled (especially when you encode and decode with the same encoder anyway).
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So, if you decode your encoded files and experience some unwanted gaps in the decoded files, then you should try to enable this option and configure it accordingly (see below). In all other cases, leave this option disabled—especially when you encode and decode with the same encoder or, as noted above, programs that themselves account for encoding/decoding delay.
  
  
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:: ''(Default: disabled)''
 
:: ''(Default: disabled)''
  
This option is usually greyed out. To make it available, a LAME executable (lame.exe) has to be placed in the EAC directory. This has to be done manually.
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This option is usually greyed out. To make it available, a [[LAME]] executable (lame.exe) has to be placed in the EAC directory. This has to be done manually.
  
 
If this option is enabled then, LAME is used automatically to decode MP3 files (''Tools'' -> ''Decompress...''). This overrides EAC's behavior which uses the Fraunhofer codec for MP3 decoding by default.
 
If this option is enabled then, LAME is used automatically to decode MP3 files (''Tools'' -> ''Decompress...''). This overrides EAC's behavior which uses the Fraunhofer codec for MP3 decoding by default.
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: '''Construction of the ID3 tag comment field on extraction'''
 
: '''Construction of the ID3 tag comment field on extraction'''
  
When the option ''Add ID3 tag'' in the ''External Compression'' tab is enabled, this setting specifies what information should be stored in the comment field. When EAC is not used to tag compressed files and tagging is completely done via command-line parameters, this setting specifies the contents of the "%e" placeholder which can be used in the command-line then. The following options are available:
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When the option ''Add [[ID3]] tag'' in the ''External Compression'' tab is enabled, this setting specifies what information should be stored in the comment field. When EAC is not used to tag compressed files and tagging is completely done via command-line parameters, this setting specifies the contents of the "%e" placeholder, which can then be included in the command line of each newly encoded file. The following options are available:
 
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* '''Write "Track <tracknumber>" into ID3 tag comment field''' ''(Default: enabled)'': Tracknumbers are written into the comment fields.
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* '''Write CRC checksums into ID3 tag comment field''': CRC checksums are written into the comment fields.
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* '''Write freedb ID into ID3 tag comment field''': freedb IDs are written into the comment fields.
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* '''Write following text into ID3 tag comment field''': A user defined text is written into the comment fields.
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+
  
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* '''Write "Track <tracknumber>" into ID3 tag comment field''' ''(Default: enabled)'': track number is written into the comment field.
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* '''Write CRC checksums into ID3 tag comment field''': a [http://en.wikipedia.org/wiki/Cyclic_redundancy_check CRC checksum] is written into the comment field.
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* '''Write freedb ID into ID3 tag comment field''': a [http://en.wikipedia.org/wiki/Freedb freedb] ID is written into the comment field.
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* '''Write following text into ID3 tag comment field''': text of your own choice is written into the comment field.
  
 
=ID3 Tag=
 
=ID3 Tag=
 
[[Image:EAC_Compression_options_ID3_Tag.png|thumb|right|Recommended settings EAC '''compression options''', '''ID3 Tag''' tab]]
 
[[Image:EAC_Compression_options_ID3_Tag.png|thumb|right|Recommended settings EAC '''compression options''', '''ID3 Tag''' tab]]
This tab offers some options regarding the ID3 tagging capabilities of EAC. Note that the option ''Add ID3 tag'' in the ''External Compression'' tab has to be enabled for all these settings to have an effect.
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This tab offers some options regarding the [[ID3]] [[tag]]ging capabilities of EAC. Note that the option ''Add ID3 tag'' in the ''External Compression'' tab has to be enabled for all these settings to have an effect.
  
  
: '''Use ID3V1.1 tags instead of ID3V1.0 tags'''
+
: '''Use ID3v1.1 tags instead of ID3v1.0 tags'''
 
:: ''(Default: enabled, '''Recommended: enabled''')''
 
:: ''(Default: enabled, '''Recommended: enabled''')''
  
When this option is enabled, ID3v1.1 tags are used instead of ID3v1.0 tags. The only difference between ID3v1.1 and ID3v1.0 is that the former can additionally store a track number. Because most players are capable of ID3v1.1 tags, it is recommended to enable this option.
+
When this option is enabled, [[ID3v1.1]] tags are used instead of [[ID3v1|ID3v1.0]] tags. The only difference between the two is that the former can additionally store a track number. Because most players are capable of reading ID3v1.1 tags, it is recommended to enable this option.
  
  
: '''Additionally write ID3V2 tags, using a padding of X kB'''
+
: '''Additionally write ID3v2 tags, using a padding of X kB'''
 
:: ''(Default: enabled/4, '''Recommended: enabled/4''')''
 
:: ''(Default: enabled/4, '''Recommended: enabled/4''')''
  
With this option enabled, EAC writes ID3v2 (ID3v2.3) tags to the encoded files (in addition to the ID3v1 tags). Because ID3v2 tags have a lot advantages over ID3v1 tags (e.g. unicode support) and are supported by most players, it is recommended to enable this option.
+
With this option enabled, EAC writes [[ID3v2]] (ID3v2.3) tags to the encoded files, in addition to the ID3v1 tags. Because ID3v2 tags have a lot advantages over ID3v1 tags (e.g. [http://en.wikipedia.org/wiki/Unicode Unicode]] support) and are supported by most players, it is recommended to enable this option.
  
As ID3v2 tags are usually placed in front of a file, there may be a problem with altering or adding tags once the file is written. If tags are added or existing tags are becoming bigger, the ID3 chunk in a file will need some more space. In the worst case, the whole audio file has to be rewritten, which may be time consuming. This is where padding comes into play. When using padding, some additional space is added to the file while encoding to store such added or growing tags. In this case, the file does not have to be rewrittten completely, only this additional padding space is used when tags are added or altered. This makes adding/altering tags a lot more convenient and faster. The only disadvantage of padding is that the encoded files are a little bigger. EAC suggests a padding size of 4 KB. This means that every encoded file will be 4 KB bigger in size compared to a file which does not use padding. So if it is likely that you change or add some tags after the file has been created, then you should leave this option at 4 KB (or fit it your needs). If saving space (e.g. for mobile usage) is more important for you, then you can set this setting to 0 KB.
+
As ID3v2 tags are usually placed in front of a file, there may be a problem with altering or adding tags once the file is written. If tags are added or existing tags are becoming bigger, the ID3 chunk in a file will need some more space. In the worst case, the whole audio file has to be rewritten, which may be time consuming.
  
 +
This is where padding comes into play. When using padding, some additional space is added to the file while encoding to store such added or growing tags. In this case, the file does not have to be rewrittten completely, only this additional padding space is used when tags are added or altered. This makes adding/altering tags a lot more convenient and faster. The only disadvantage of padding is that the encoded files are a little bigger. EAC suggests a padding size of 4 KB. This means that every encoded file will be 4 KB bigger in size compared to a file which does not use padding. So if it is likely that you change or add some tags after the file has been created, then you should leave this option at 4 KB (or fit it your needs). If saving space (e.g. for mobile usage) is more important for you, then you can set this setting to 0 KB.
  
: '''Use ID3V2.4.0 tags instead of ID3V2.3.0 tags'''
+
 
 +
: '''Use ID3v2.4.0 tags instead of ID3v2.3.0 tags'''
 
:: ''(Default: disabled, '''Recommended: disabled''')''
 
:: ''(Default: disabled, '''Recommended: disabled''')''
  
ID3v2.4 is the latest development of this standard and has a few advantages over ID3v2.3 (e.g. allows usage of UTF-8 encoding). But there seems to be a bug in EAC that no ID3v2.4 can be written. Actually, when this option is enabled, EAC does not write any ID3v2 tags at all (not even ID3v2.3). Therefore it is recommended to leave this option disabled.
+
ID3v2.4 is the latest development of this standard and has a few advantages over ID3v2.3 (e.g. allows usage of [http://en.wikipedia.org/wiki/UTF-8 UTF-8] character encoding). However, there was a bug in EAC that no ID3v2.4 can be written: in fact, when this option is enabled, EAC does not write any ID3v2 tags at all, so it is recommended to leave this option disabled.
  
 +
<!-- Is the above still valid for newer versions? -->
  
: '''Use track format xx/xx in ID3V2 tags (e.g. 01/16)'''
+
 
 +
: '''Use track format xx/xx in ID3v2 tags (e.g. 01/16)'''
 
:: ''(Default: enabled, '''Recommended: enabled''')''
 
:: ''(Default: enabled, '''Recommended: enabled''')''
  
Line 364: Line 364:
 
:: ''(Default: %T - %A)''
 
:: ''(Default: %T - %A)''
  
This option specifies how filenames are constructed from ID3 tags when using the rename feature of EAC (''Tools'' -> ''Rename From ID3 Tags...''). You can use placeholder to build up the filename.
+
This option specifies how file names are constructed from ID3 tags when using the rename feature of EAC (''Tools'' -> ''Rename From ID3 Tags...''). You can use placeholder to build up the filename.
  
 +
=External links=
  
 
+
* [http://www.exactaudiocopy.de/en/index.php/support/faq/ EAC FAQ (placeholders for command-line options)]
=External links=
+
* [http://en.wikipedia.org/wiki/Cyclic_redundancy_check Wikipedia:
 
* [http://www.sonicspot.com/guide/wavefiles.html The Sonic Spot: Wave File Format]
 
* [http://www.sonicspot.com/guide/wavefiles.html The Sonic Spot: Wave File Format]
* [http://en.wikipedia.org/wiki/Resource_Interchange_File_Format Wikipedia: Resource Interchange File Format]
+
* [http://en.wikipedia.org/wiki/Resource_Interchange_File_Format Wikipedia: Resource Interchange File Format]Cyclic redundancy check]
* [http://www.exactaudiocopy.de/en/index.php/support/faq/ EAC FAQ (placeholders for command-line options)]
+
* [http://en.wikipedia.org/wiki/Cyclic_redundancy_check Wikipedia: Cyclic redundancy check]
+
 
* [http://en.wikipedia.org/wiki/Id3 Wikipedia: ID3]
 
* [http://en.wikipedia.org/wiki/Id3 Wikipedia: ID3]
  
  
 
[[Category:EAC Guides]]
 
[[Category:EAC Guides]]

Revision as of 12:52, 25 June 2011

In Exact Audio Copy’s compression options dialog (keyboard shortcut: F11) are found all options regarding the creating of compressed audio files. Here the user specifies how EAC is to behave when they press the MP3 Button in the main window or select compressed items under the Action menu.

Note: many options are dependent on the codec or external compressor (encoder). So, often no clear recommendation can be given. It is important that the user has a general understanding of what these settings do and how they possibly change the behavior of EAC and/or the codec/external compressor.

This article was recently updated to reflect changes introduced in EAC v1.0b2; however, the instructions for prior versions were retained for reference.

Waveform

Example settings compression options, Waveform tab

This tab allows you to select and choose the options for an internal codec. After audio data is read from the CD, EAC will pass it to the codec, and will write the codec's output to a file. Generally speaking, EAC’s internal codec support is for writing unusual WAV files (e.g. containing audio in the ADPCM format or as a rare way of storing MP3 data), although the options do allow for writing other formats.

An internal codec is a CBR (constant bit rate) audio converter library managed through the Windows Audio Compression Manager (ACM) legacy interface, and it typically has a filename ending in .acm. Windows comes with a few such codecs installed already. These aren’t programs you run directly; they’re just converters invoked from within another program, e.g. EAC.

All options are greyed out here if Use external program for compression in the External Compression tab is ticked. When using an external compressor, you of course cannot use an internal codec.

Today, most people ripping music CDs don't use internal codecs; they use an external compressor, which is configured in the External Compression tab. An external compressor is a separate program that can be run directly from a command shell with various arguments telling it which file to compress, what tags to add, the output filename, etc.


Wave format

In this drop down box, all codecs installed on your system are listed. When new codecs are installed, they should show up in this list. The codec to choose depends on what should be achieved with the compression (sample format, compression ratio, etc.).


Sample format

With this option, different combinations of parameters for the compression and output format can be chosen, such as sample rate, resolution, mono/stereo. Which options are available here depends on the codec selected at the Wave format option (e.g. some codecs only support 4 bit resolution).

If you were to choose Microsoft PCM Converter as the codec, and 44,100 Hz, 16 Bit, Stereo as the output format, it would be the same as doing an uncompressed CD rip.


Add ID3 tag
(Default: disabled, Recommended: enabled)

Some formats (e.g. MP3) support ID3 tags. When this option is enabled, EAC will add these tags to the compressed files (only if the file format supports ID3 tags).


Do not write WAV header to file
(Default: disabled)

The codec only converts the audio data. EAC writes it to a file. This parameter determines whether to include a WAV header in the file.

Although it has become a de facto standard that WAV files contain 16 bit, 44.1 kHz stereo PCM audio data (as on audio CDs), what actually makes an audio file a WAV file is not the format of the audio data itself but the presence of a WAV header at its beginning. The header specifies which data chunk(s) are in the file (normally there's just a single chunk consisting of all the audio), info about what format it’s in, and possibly some other rudimentary metadata. When such a header is present, EAC will ensure the output filename ends with .wav.

If you have chosen a codec that outputs PCM data, then you probably do want a WAV header and filename ending in .wav, so this option should be enabled. But if you have chosen a codec that outputs MP3 or Ogg Vorbis data, then the WAV header is optional, and in fact is probably not what you want, unless you have a specific need to put the compressed audio into a WAV file.

For example, if you choose an MP3 codec, and you have this option disabled, then you'll generate an ordinary MP3 file, and therefore you should enter .mp3 in the next box (file extension for headerless files) to make sure it has a helpful filename. But if you choose an MP3 codec and you have this option enabled, then you'll generate an MP3 file that begins with a WAV header, and the filename will end in .wav, and is likely to be confusing.


File extension for header files
(Default: .raw)

When the Do not write WAV header to file option is enabled, a filename extension for the output files can be specified here (e.g. .mp3 for MP3 files). If the above option is disabled, this setting gets greyed out automatically.


Quality setting
(Default: High quality (slow), Recommended: High quality (slow))

Some codecs support a quality setting to choose between a higher quality of the output files or faster encoding speed. If quality is the only matter, leave this option at the default, which is High quality (slow).

When using a User defined encoder, you can demarcate any portion of your custom command line as being for low- (delimit the chosen parameters with %l) and high-quality (similar but with %h) modes only and use this option to choose between the two.

Note: EAC offers this choice of quality settings even if the selected codec doesn't use it.

External compression

Recommended settings EAC compression options, External Compression tab

In this tab, all options for external compressors can be configured. As all settings are highly dependent on the particular compressor, most settings are only described here in general terms because often no specific recommendations can be given; but see the many EAC guides (also linked below) written by Hydrogenaudio users for in-depth advice on topics including configuring various external encoders.

General recommendation: To avoid unwanted side effects and to be able to configure the encoding process in every detail, User Defined Encoder should be used as Parameter passing scheme and all options should be specified via the Additional command-line options only.

"Side effects" basically means that it is a little complex what options have which effect when another Parameter passing scheme is specified (e.g. some settings are ignored completely). These side effects are explained in the following parameters, but specifying User Defined Encoder and using the command-line options only is a lot more convenient.

As mentioned above, there are also a few articles with details about how to configure EAC to use particular encoders:


Use external program for compression
(Default: disabled, Recommended: enabled)

To use an external compressor, this setting has to be enabled; otherwise, all the options here are greyed out.


Parameter passing scheme

EAC comes with a few presets concerning external compressors and the required parameter passing scheme; they can be selected with this option (e.g. the Bit rate box will show all available options after a particular compressor was chosen here). But in general, the capabilities of EAC in passing parameters to external compressors are limited. In order to overcome some of these limitations, you can and should use the Additional command-line options for to pass parameters. The usual approach is setting the Parameter passing scheme to User Defined Encoder and using the Additional command-line options to specify all the encoding options.


Use file extension

When using a User Defined Encoder as above, a file extension must be specified here. This should be the extension of the encoded file type (e.g. .flac when using a FLAC encoder and mp3 when encoding to MP3).


Program, including path, used for compression

The absolute path to the program used for compression. This may be an .exe or a .dll file (e.g. C:\Program Files\LAME\lame.exe). By clicking on the Browse... button, this path can be chosen by a file dialog.


Additional command-line options

Here additional parameters for the external compressor can be specified. To configure the additional command-line options, you can use the following placeholders (taken from the EAC FAQ):

For EAC 1.0 beta 2 and newer
placeholder meaning
 %source% Source filename
 %dest% Destination filename
 %original% Original filename (without temporary renaming)
 %ishigh%…%ishigh% Text “…” only when “High quality” selected
 %islow%…%islow% Text “…” only when “Low quality” selected
 %haslyrics%…%haslyrics% Text “…” only when lyrics exist
 %hascover%…%hascover% Text “…” only when storing cd cover is enabled and cover exists
 %crcenabled%…%crcenabled% Text “…” only when “CRC checksum” selected
 %title% Track title
 %genre% MP3 music genre
 %year% Year
 %cddbid% freedb ID
 %artist% Track artist
 %lyrics% Lyrics
 %lyricsfile% Filename of lyrics text file (ANSI)
 %bitrate% Bitrate (“32″..”320″)
 %comment% Comment (as selected in EAC)
 %tracknr% Track number
 %totalcds% Total number of CDs in the given CD set
 %cdnumber% Number of the CD
 %composer% Track performer
 %trackcrc% CRC of extracted track
 %coverfile% Filename of CD cover image
 %numtracks% Number of tracks on album
 %albumtitle% CD title
 %albumartist% CD artist
 %albumcomposer% CD composer
 %albuminterpret% – CD performer
 %% The ‘%’ character

So, an exemplary EAC 1.0b2 or newer command-line for the LAME MP3 encoder could look like this :

-V 0 --vbr-new --ta "%artist%" --tt "%title%" --tl "%albumtitle%" --tg "%genre%" --ty "%year%" --tn "%tracknr%" --tc "%comment%" %source% %dest%

As you can see, the command-line options of LAME (e.g. -V 0, --ta, --tt, etc.) are used in conjunction with the EAC placeholders (e.g. %artist%, %title%, etc.) to control LAME using this command-line.

For EAC 1.0 beta 1 and older
placeholder meaning
 %s Source filename
 %d Destination filename
 %h...%h Text "..." only when High quality selected
 %l...%l Text "..." only when Low quality selected
 %c...%c Text "..." only when CRC checksum selected
 %r Bitrate ("32".."320") as chosen in the Bit rate option
 %a CD artist
 %g CD title
 %t Track title
 %y Year
 %n Track number
 %m MP3 music genre
 %o Original filename (without temporary renaming)
 %e Comment (as selected in EAC)
 %b CRC of extracted track
 %f freedb ID
 %x Number of tracks on album

So, an exemplary EAC 1.0b1 or earlier command-line for the LAME MP3 encoder could look like this:

-V 0 --vbr-new --ta "%a" --tt "%t" --tl "%g" --tg "%m" --ty "%y" --tn "%n" --tc "%e" %s %d

As you can see, the command-line options of LAME (e.g. -V 0, --ta, --tt, etc.) are used in conjunction with the EAC placeholders (e.g. %a, %t, etc.) to control LAME only by this command-line.


Bit rate

What is shown in this drop-down box depends on the Parameter passing scheme selected and specifies the bit rate/quality settings of the external compressor. This setting is also used to calculate the approximate size of the compressed tracks shown in EAC's main window.

In the case that User Defined Encoder is selected as the Parameter passing scheme, this setting does not have an effect unless the %r parameter is specified in the Additional command-line options.


Quality setting
(Default: High quality, Recommended: High quality)

Many encoders offer the choice between better quality or faster encoding speed. This option is designated to choose between these two settings, but the precise behavior depends on what is selected on the Parameter passing scheme:

If User Defined Encoder is chosen, this option does not have an effect unless the %h…%h and %l…%l parameters are used in the Additional command-line options (see below).

When any other Parameter passing scheme is used, this setting is reflected on the particular encoder. When using LAME for instance, High quality corresponds to the -h switch, whereas Low quality uses the -f switch (in this case, these switches specify the "Noise shaping and psycho acoustic algorithms", means choice between quality and encoding speed). This is another reason that it is advisable to use a completely custom User defined encoder; but if you do use another scheme, you will probably want to ensure that High quality is selected.

As already mentioned above, with this setting it is also possible to configure the Additional command-line option even further: by delimiting chosen portions of your command line with the placeholders %h and %l, you can specify two alternate settings for the external compressor to use depending on this option. The following example (simplified) shows how to use this feature (again with LAME):

%h-V0%h%l-V5%l --vbr-new %s %d

In this case, if the High quality option is chosen, LAME will encode with -V0; whereas it will encode at -V5 when Low quality is selected.


Delete WAV after compression
(Default: enabled, Recommended: enabled)

If this setting is enabled, EAC automatically deletes the extracted WAV file after compression. If you do not need these files (of course the compressed files are kept) after extraction/compression, leave this option enabled.


Use CRC check
(Default: enabled, Recommended: disabled)

Some encoders have the ability to store a CRC checksum (cyclic redundancy check) in the resulting (compressed) file. This might be used then to check the consistency of this file during playback. But enabling this CRC check has two major drawbacks: First, this will add 16 bits (the CRC value) on every frame of the encoded file and will possibly increase the file size considerably. Second, many encoders do not support this feature very well because of calculating wrong CRC checksums. So usually players will simply ignore this information. This option also has no effect at all when selected User Defined Encoder at the Parameter passing scheme. Thus having more disadvantages, it is generally recommended to disable this option regardless of the encoder used.

When User Defined Encoder is chosen, this setting allows additional parameters to take effect using the %c...%c placeholder, otherwise it has no effect.


Add ID3 tag

When this option is enabled, EAC writes ID3 tags to the compressed files. Make sure only to use this setting with mp3 files. Formats such as flac, TAK, WavPack, Monkey's Audio and Ogg Vorbis were not intended to use ID3 tags and adding such tags may cause problems.

Another possibility to include ID3 tagging is to use the external compressor itself to tag the resulting files. This would be done via the Additional command-line options. Indeed, it is recommended to use this where available, as seen in the above example command lines for LAME. (If this option is enabled and tagging instructions are included in the command line, the latter have no effect because EAC immediately overwrites the tags written by the encoder.


Check for external programs return code
(Default: disabled, Recommended: enabled)

When this setting is enabled, EAC checks the return code of an external compressor. When the external compressor returns an error code (e.g. because of a wrong command-line parameter was used), EAC shows this error message in a dialog box. So, it’s recommended to enable this option in order to diagnose any errors.

Offset

Recommended settings EAC compression options, Offset tab

This tab offers options regarding offset correction during encoding/decoding and the ID3 tag comment field.

Note: The offset mentioned here has nothing to do with a drive offset and therefore should not be mistaken for the latter. In addition, most popular encoders now have their own built-in compensation for encoding offsets, and certain decoders can use this to eliminate any unwanted gaps; in such cases, these options are unnecessary.


Use Offset Correction for encoding and decoding
(Default: disabled, Recommended: disabled)

Some encoders will have an offset when encoding. This means that at the beginning of a track they often add some silence, whereas a few samples could be missing at the end. When decoding again, this could result in some unwanted gaps. This options offers now the opportunity to correct this encoding/decoding offset so that the original file can be reconstructed (at least concerning correct beginning/end of a track; with lossy formats the original file can not be reconstructed completely). The point behind this option is that is possible that there is such an offset between the codec which is used for encoding (the actual codec) and the other one used for decoding (default installed codec). An example would be using LAME for MP3 encoding and the Fraunhofer codec for decoding. In this case, this option would be useful.

So, if you decode your encoded files and experience some unwanted gaps in the decoded files, then you should try to enable this option and configure it accordingly (see below). In all other cases, leave this option disabled—especially when you encode and decode with the same encoder or, as noted above, programs that themselves account for encoding/decoding delay.


Sample offset
(Default: 0)

When enabling the option Use Offset Correction for encoding and decoding, a sample offset has to be entered here. With a click on the button Detect Offset... the correct offset can be recognized automatically.


Use LAME command-line encoder/decoder for decoding MP3 files
(Default: disabled)

This option is usually greyed out. To make it available, a LAME executable (lame.exe) has to be placed in the EAC directory. This has to be done manually.

If this option is enabled then, LAME is used automatically to decode MP3 files (Tools -> Decompress...). This overrides EAC's behavior which uses the Fraunhofer codec for MP3 decoding by default.


Construction of the ID3 tag comment field on extraction

When the option Add ID3 tag in the External Compression tab is enabled, this setting specifies what information should be stored in the comment field. When EAC is not used to tag compressed files and tagging is completely done via command-line parameters, this setting specifies the contents of the "%e" placeholder, which can then be included in the command line of each newly encoded file. The following options are available:

  • Write "Track <tracknumber>" into ID3 tag comment field (Default: enabled): track number is written into the comment field.
  • Write CRC checksums into ID3 tag comment field: a CRC checksum is written into the comment field.
  • Write freedb ID into ID3 tag comment field: a freedb ID is written into the comment field.
  • Write following text into ID3 tag comment field: text of your own choice is written into the comment field.

ID3 Tag

Recommended settings EAC compression options, ID3 Tag tab

This tab offers some options regarding the ID3 tagging capabilities of EAC. Note that the option Add ID3 tag in the External Compression tab has to be enabled for all these settings to have an effect.


Use ID3v1.1 tags instead of ID3v1.0 tags
(Default: enabled, Recommended: enabled)

When this option is enabled, ID3v1.1 tags are used instead of ID3v1.0 tags. The only difference between the two is that the former can additionally store a track number. Because most players are capable of reading ID3v1.1 tags, it is recommended to enable this option.


Additionally write ID3v2 tags, using a padding of X kB
(Default: enabled/4, Recommended: enabled/4)

With this option enabled, EAC writes ID3v2 (ID3v2.3) tags to the encoded files, in addition to the ID3v1 tags. Because ID3v2 tags have a lot advantages over ID3v1 tags (e.g. Unicode] support) and are supported by most players, it is recommended to enable this option.

As ID3v2 tags are usually placed in front of a file, there may be a problem with altering or adding tags once the file is written. If tags are added or existing tags are becoming bigger, the ID3 chunk in a file will need some more space. In the worst case, the whole audio file has to be rewritten, which may be time consuming.

This is where padding comes into play. When using padding, some additional space is added to the file while encoding to store such added or growing tags. In this case, the file does not have to be rewrittten completely, only this additional padding space is used when tags are added or altered. This makes adding/altering tags a lot more convenient and faster. The only disadvantage of padding is that the encoded files are a little bigger. EAC suggests a padding size of 4 KB. This means that every encoded file will be 4 KB bigger in size compared to a file which does not use padding. So if it is likely that you change or add some tags after the file has been created, then you should leave this option at 4 KB (or fit it your needs). If saving space (e.g. for mobile usage) is more important for you, then you can set this setting to 0 KB.


Use ID3v2.4.0 tags instead of ID3v2.3.0 tags
(Default: disabled, Recommended: disabled)

ID3v2.4 is the latest development of this standard and has a few advantages over ID3v2.3 (e.g. allows usage of UTF-8 character encoding). However, there was a bug in EAC that no ID3v2.4 can be written: in fact, when this option is enabled, EAC does not write any ID3v2 tags at all, so it is recommended to leave this option disabled.


Use track format xx/xx in ID3v2 tags (e.g. 01/16)
(Default: enabled, Recommended: enabled)

ID3v1 is only able to store the track number itself (e.g. "05"). With ID3v2 it is possible to store also the number of total tracks (e.g. "05/15"). If you wish to keep this information with your files, leave this option enabled.


Construction of filenames from ID3 tags
(Default: %T - %A)

This option specifies how file names are constructed from ID3 tags when using the rename feature of EAC (Tools -> Rename From ID3 Tags...). You can use placeholder to build up the filename.

External links