dBpoweramp: mp3 (Lame)

Lame has been continuously developed over the years and is the highest quality mp3 encoder available today.

Illustrate are an official patent licensor for the MPEG technologies (held by Technicolor). Illustrate are also one of the few companies who have made a sizable donation to the Lame development project.

Supported by this Codec

  • Encoding: Yes   [.mp3]
  • Multi-processor Encoding: Yes   (with dBpoweramp reference)
  • Decoding: Yes   [.m2a, .mp1, .mp2, .mp3, .mpa, .mpg, .mpga, .mpx]
  • ID Tag Reading: Yes   [ID3v2, ID3v1, APEv2]
  • ID Tag Writing: Yes   [ID3v2 (default), ID3v1, APEv2]
  • Unicode Tagging: Yes (id3v2)
  • Supports Album Art: Yes (id3v2)
  • Gapless Encoding & Decoding: Yes
  • Unicode Filenames: Yes



Compression Options

Lame offers 4 types of encoding:

  • Quality (VBR) Variable Bitrate files are made up from 100's of small audio chunks, called frames. Whilst encoding VBR, the encoder decides which bit rate to use for each frame. Bit rates can drop down to lower values when it is warranted (if there is not much sound complexity) and switch up to a higher bit rate when required. VBR files are the preferred method of mp3 encoding,
  • Bit Rate (ABR)Average Bit Rate (ABR) is like VBR except constraints are placed on Bit Rate so that over time it averages out to the desired value,
  • Bit Rate (CBR) A constant bit rate is used throughout the encoding process.
  • Free Format extends the constant bit rate to much higher values (such as 640 kbps), has limited player support.

Encoding specifies how much effort goes into compression, this mode is applicable to all types of encoding.



Codec Background

LAME is open source developed under the LGPL, the name is an acronym for Lame Ain't an Mp3 Encoder in terms of quality, LAME is the top mp3 encoder.

Further details: [http://lame.sourceforge.net]



ID Tag Details

mp3 files can store 3 different ID Tag types: ID3v2, APEv2 and ID3v1 (old standard):

ID3v2 able to store fields of any name and any length, Unicode compatible, can store album art & ratings, recommended as the tagging format.

APEv2 able to store fields of any name and any length, fully Unicode compatible. APEv2 Tags can store album art. Limited player support.

ID3v1 limited to fixed fields of around 30 characters each: Artist, Album, Title, Comment and special numerical fields: Track Number, Genre, Year. ID3v1 tags are not Unicode compatible.



Advanced Options

dBpoweramp Configuration offers advanced options for this codec (dBpoweramp Configuration >> Codecs >> Advanced Options):

mp3 ID Tagging

Tag Creation determines which ID tag is used for newly created files.

ID3v1 Version if v1 tags are being written, this option switches between the 1.1 standard (with track number) and 1.0

ID3v2 Text Encoding if your player supports Unicode then UTF-16 can be used to save international tags

mp3 Decoder

Output 16 bit to 32 bit float gives the option to select the output from the decoder, 32 bit float is automatically selected when an encoder can use the higher resolution. mp3 stores internally encodings as floating point, but generally speaking encoding a 16 bit audio CD to mp3 then back to 32 bit floating point wave will not yield extra bit depth.

CRC Errors gives the option to ignore errors in the decoded stream, report as information or report as errors.



Terminology

Encoding:  compress and write audio track,
Decoding:  uncompress and read the track,
ID Tags:  meta data such as artist & album are embedded inside the audio file,
Lossless:  compression without audio quality loss,
Lossy:  audio quality is sacrificed (how much depends on bitrate and codec used) to achieve smaller files,
Gapless:  allows the decoder to decode audio stream without gaps (silence),
Multi-processor Encoding:  for multi core processors multiple files can be compressed at once fully using all cores.

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