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- The --alt-preset switches are designed to provide the highest possible quality.
-
- They have for the most part been subject to and tuned via rigorous double blind
- listening tests to verify and achieve this objective.
-
- These are continually updated to coincide with the latest developments that
- occur and as a result should provide you with nearly the best quality
- currently possible from LAME.
-
- Abreviations:
- VBR = variable bitrate
- ABR = average bitrate
- CBR = constant bitrate
-
- To activate these presets:
-
- For VBR modes (generally highest quality):
-
- "--alt-preset standard" This preset should generally be transparent
- to most people on most music and is already
- quite high in quality.
-
- "--alt-preset extreme" If you have extremely good hearing and similar
- equipment, this preset will generally provide
- slightly higher quality than the "standard"
- mode.
-
- For CBR 320kbps (highest quality possible from the --alt-preset switches):
-
- "--alt-preset insane" This preset will usually be overkill for most
- people and most situations, but if you must
- have the absolute highest quality with no
- regard to filesize, this is the way to go.
-
- For ABR modes (high quality per given bitrate but not as high as VBR):
-
- "--alt-preset <kbps>" Using this preset will usually give you good
- quality at a specified bitrate. Depending on the
- bitrate entered, this preset will determine the
- optimal settings for that particular situation.
- While this approach works, it is not nearly as
- flexible as VBR, and usually will not attain the
- same level of quality as VBR at higher bitrates.
-
- The following options are also available for the corresponding profiles:
-
- <fast> standard
- <fast> extreme
- insane
- <cbr> (ABR Mode) - The ABR Mode is implied. To use it,
- simply specify a bitrate. For example:
- "--alt-preset 185" activates this
- preset and uses 185 as an average kbps.
-
- "fast" - Enables the new fast VBR for a particular profile. The
- disadvantage to the speed switch is that often times the
- bitrate will be slightly higher than with the normal mode
- and quality may be slightly lower also.
-
- "cbr" - If you use the ABR mode (read above) with a significant
- bitrate such as 80, 96, 112, 128, 160, 192, 224, 256, 320,
- you can use the "cbr" option to force CBR mode encoding
- instead of the standard abr mode. ABR does provide higher
- quality but CBR may be useful in situations such as when
- streaming an mp3 over the internet may be important.
-
- For example:
-
- or "lame --alt-preset fast standard <input file> <output file>"
- or "lame --alt-preset cbr 192 <input file> <output file>"
- or "lame --alt-preset 172 <input file> <output file>"
- or "lame --alt-preset extreme <input file> <output file>"