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| [[category:Encoder/Decoder]] | | #REDIRECT [[Nero AAC]] |
| {{Software Infobox
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| | name = Nero AAC Codec
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| | logo =
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| | screenshot =
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| | caption =
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| | maintainer = Nero AG
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| | stable_release = 1.5.4.0 (Feb 18. 2010)
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| | preview_release = n/a
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| | operating_system = Windows, Linux
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| | use = Encoder/Decoder
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| | license = see site for license
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| | website = [http://www.nero.com/enu/technologies-aac-codec.html Nero AAC Codec]
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| }}
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| The Nero AAC codec has been made freely available by Nero AG for personal non-commercial and/or technology-evaluation purposes. It is a set of three command-line tools that are used to encode, decode and apply tags to MP4 files. The download contains binaries for both Windows and Linux. It is the same codec that is used in Nero's other, commercial products.
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| The three command-line tools are:
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| * NeroAacEnc
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| * NeroAacDec
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| * NeroAacTag
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| <span style="color:red">'''This article is still a work in progress'''</span>
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| == NeroAacEnc ==
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| This is the encoder command-line tool. It is currently at version 1.5.4.0 and was last updated Feb 18th, 2010.
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| === Usage ===
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| Windows
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| <pre>neroAacEnc.exe [options] -if <input-file> -of <output-file></pre>
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| Linux:
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| <pre>./neroAacEnc [options] -if <input-file> -of <output-file></pre>
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| <small>Note: Make sure the binary is executable</small>
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| Where:
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| ; <input-file>
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| :Path to source file to encode.<br>The file must be in Microsoft WAV format and contain PCM data.<br>Specify - to encode from stdin.<br>Note that multiple input files can be specified, they will be encoded together into a single output file with chapter marks indicating source file divisions.
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| ; <output-file>
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| : Path to output file to encode to, in MP4 format.
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| ==== Options: ====
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| ===== Quality/bitrate control =====
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| ; <tt>-q <number></tt>
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| : Enables "target quality" mode.<br><tt><number></tt> is a floating-point number in 0...1 range. I.e. 0.5 or 0.75, etc. with 1 being the highest quality and thus also having the largest output file size.
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| ; <tt>-br <number></tt>
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| : Specifies "target bitrate" mode.<br><tt><number></tt> is target bitrate in bits per second.
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| ; <tt>-cbr <number></tt>
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| : Specifies "target bitrate (streaming)" mode.<br><tt><number></tt> is target bitrate in bits per second.
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| When neither of above quality/bitrate options is used, the encoder defaults to equivalent of <tt>-q 0.5</tt>
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| The following VBR quality settings result in the following average bitrates:
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| {| cellpadding=3 cellspacing=0 border=1
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| ! Quality
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| ! Bitrate (kbit/s)
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| |-
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| | 0.05
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| | 16
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| |-
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| | 0.15
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| | 33
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| |-
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| | 0.25
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| | 66
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| |-
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| | 0.35
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| | 100
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| |-
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| | 0.45
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| | 146
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| |-
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| | 0.55
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| | 192
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| |-
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| | 0.65
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| | 238
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| |-
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| | 0.75
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| | 285
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| |-
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| | 0.85
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| | 332
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| |-
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| | 0.95
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| | 381
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| |}
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| ===== Multipass encoding =====
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| ; <tt>-2pass</tt>
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| : Enables two-pass encoding mode.<br>Note that two-pass mode requires a physical file as input, rather than stdin.
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| ; <tt>-2passperiod <number></tt>
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| : Overrides two-pass encoding bitrate averaging period, in milliseconds.<br>Specify zero to use least restrictive value possible (default).
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| ===== Advanced features / troubleshooting =====
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| ; <tt>-lc</tt>
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| : Forces use of LC AAC profile (HE features disabled).
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| ; <tt>-he</tt>
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| : Forces use of HE AAC profile (HEv2 features disabled).
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| ; <tt>-hev2</tt>
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| : Forces use of HEv2 AAC profile
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| ''Note that the above switches (-lc, -he, -hev2) should not be used''. The optimal AAC profile is automatically determined from quality/bitrate settings when no override is specified.
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| ; <tt>-ignorelength</tt>
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| : Ignores length signaled by WAV headers of input file. Useful for certain frontends using stdin.
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| == NeroAacDec ==
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| NeroAacDec is the command-line decoder. It is currently at version 1.5.1.0 and was last updated Dec 17th, 2009.
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| === Usage ===
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| Windows:
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| <pre>neroAacDec.exe -if <input file> -of <output file> [-chapter <number>]</pre>
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| ==== Options ====
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| ; <tt>-chapter <number></tt>
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| : Specify the chapter number
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