-alt-preset extreme: -V0, lowpass 19.5khz, min.-alt-preset standard: ditto but slower (more reliable) algorithm.īasically indistinguishable from original.96kbps, lowpass 19khz (target bitrate 190kbps) -alt-preset fast standard: -V2 -vbr_new, min.-r3mix: -V3 -vbr_new, lowpass 18khz (target bitrate: 175kbps).-preset medium: -V4 lowpass 18khz (target bitrate: 165kbps).What do the VBR presets in LAME correspond to? Harman-Kardon, say no more) - let alone on a quality stereo system. You WILL hear the difference on Apple Pro Speakers (actually made by Not hear the difference on el cheapo "multimedia speakers". Or with the old N2MP3 encoder (which is maybe slightly better at 128kbps). I have a large backlog of 128kbps and 160kbps CBR files, all done with LAME Try to come up with a file that has the average bitrate you specify. Predictable file lengths and the player can handle variable bit rates, thenĪBR (average bitrate encoding) is the best option, where the encoder will Portable MP3 player (or MP3 discman) that cannot handle VBR. Nowadays, the only good reason to stick with FBR would be if you have an older In quality, because it can encode very complex sounds at exceedingly highīitrates (up to 320kbps) that would be wasteful to use for the whole VBR is on the one hand more economical in disk space than high-bitrate CBR, and on the other hand more homogenous deviation from originalīelow a set threshold) has been reached. Higher bitrates until a certain quality criterion (e.g. What bitrates to use? What about variable bitrates?Ĭonstant bitrate encoding (CBR) uses the same bitrate throughout a track variableīitrate encoding (VBR) takes a "frame" and tries to encode it with progressively There are a number, but my only experience under OS X is with iTunes. but an excellent GUI version integrated with iTunes is available: People notĪfraid of Unix command lines can download and compile the source themselves Gives its commercial counterparts a run for their money. The answer for everybody else is LAME (Lame Ain't an MP3 Encoder, in the Songs bought at the iTunes online music store areĮncoded in AAC - at 128kbps, this encoder cannot be beaten. Than MP3, and if files with somewhat aggressive "digital rights managements"ĭon't totally turn you off, iTunes' AAC (Advance Audio Coding) encoder If you are willing to consider formats other The built-in encloder in iTunes 4 will probably do if "Oooh baby do me one more time" is your idea of a musical experience. Use is perfectly legal, but selling MP3 files encoded from commercial CDs,Īre there any good encoders for Mac OS X? That is, encoding one's own CDs for personal Much higher for images) than lossy algorithms. Is that they generally achieve much lower compression ratios (in the 2:1 range for audio, Representation, but do preserve all the details of the original. in the original file to arrive at a compressed Well as such popular file compression formats as ZIP on PCs, gzip on Unix In contrast to so-called "lossless" algorithms, like GIF for pictures (or Shorten for sound), as MP3 is a so-called "lossy compression" algorithm, which (like JPEGįor pictures) takes advantage of the limitations of human perception toĪchieve very high compression ratios. Of uncompressed music, can hold something like 8-14 hours worth of MP3 That is to say, a regular CD, which holds up to 80 minutes It is an audio compression format that on average yields (claimed) near-CD qualityĪt 1:11, and de facto CD quality at 1:6 to 1:8, the size of the original. The short answer: MP3 stands for MPEG (Motion Picture Experts Group) Layerģ. Nota bene: I have migrated to Mac OS X ages ago. MP3 on Mac OS X Disclaimer: any opinions expressed in this article are those of itsĪuthor ( and do not purport to represent Weizmann Institute of Science policy.
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