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MP3 - MPEG Layer-3, File Format Information and Conversion

MP3 - MPEG Layer-3

MP3 is a digital audio compression algorithm that acheives a compression factor of about twelve while preserving sound quality. It does this by optimising the compression according to the range of sound that people can actually hear. MP3 is currently (July 1999) the most powerful algorithm in a series of audio encoding standards developed under the sponsorship of the Moving Picture Experts Group (MPEG) and formalised by the International Organization for Standardization (ISO).

MP3 is very different from Layer 2, using an additional MDCT layer to increase frequency resolution. Its scale factor groups are more optimised for the human ear, and it uses nonlinear sample quantisation and Huffman coding. MP3 files (filename extension ".mp3") can be downloaded from many World-Wide Web sites and can be played using software available for most operating systems (also downloadable), e.g. Winamp for PC, MacAmp for Macintosh, and mpeg123 for Unix. MP3 files are usually downloaded completely before playing but streaming MP3 is also possible. A program called a "ripper" can be used to copy a selection from a music CD onto your hard disk and another program called an encoder can convert it to an MP3 file.

Windows ships with limited MP3 encoding support. The output sample rate is limited to 24khz and the bitrate is limited 56kbps. However, many add-on packages from open source community make it possible to encode at higher sample rate and bitrate.

A commonly used open source codec is LAME. LAME comes in different forms, including a ACM (Audio compression manager) codec and a DLL (lame_enc.dll). Caution: LAME ACM does not work well on many computers, regardless which software is loading it. It is best to avoid installing LAME ACM and use lame_enc.dll instead.

MPEG.ORG is an excellent source for additional information on MPEG format and usage. 

Convert from MP3(MPEG Layer-3)

To extract audio from MP3(MPEG Layer-3), you will need Audio Converter.

Please see the following tutorials.

AIF(AIFF/AIFC Apple Audio)Tutorial: MP3 to AIF
M4A(MPEG-4 Audio)Tutorial: MP3 to M4A
MP3(MPEG Layer-3)Tutorial: MP3 to MP3
MPA(MPEG Audio)Tutorial: MP3 to MPA
OGG(OGG Vorbis Audio)Tutorial: MP3 to OGG
RA(RealAudio)Tutorial: MP3 to RA
WAV(Waveform)Tutorial: MP3 to WAV
WMA(Windows Media Audio)Tutorial: MP3 to WMA

Convert to MP3(MPEG Layer-3)

To convert to MP3(MPEG Layer-3), you will need Audio Converter. Please see the following tutorials.

3G2(3GPP2 Mobile Video)Tutorial: 3G2 to MP3
3GP(3GP Mobile Video)Tutorial: 3GP to MP3
AAC(Advanced Audio Coding)Tutorial: AAC to MP3
AC3(Dolby Digital AC-3 Audio)Tutorial: AC3 to MP3
AIF(AIFF/AIFC Apple Audio)Tutorial: AIF to MP3
ALAC(Apple Lossless)Tutorial: ALAC to MP3
AMR(Adaptive Multi-Rate)Tutorial: AMR to MP3
APE(Monkey Audio)Tutorial: APE to MP3
ASF(Advanced Streaming Format)Tutorial: ASF to MP3
AU(UNIX Audio)Tutorial: AU to MP3
AVI(Audio Video Interleaved)Tutorial: AVI to MP3
CDA(Audio CD Track)Tutorial: CDA to MP3
DIVX(DivX Video)Tutorial: DIVX to MP3
DTS(Digital Theater System)Tutorial: DTS to MP3
DV(Digital Video Cassette)Tutorial: DV to MP3
DVD(Digital Versatile Disk)Tutorial: DVD to MP3
DVR-MS(Microsoft Digital Video Recordin)Tutorial: DVR-MS to MP3
EVOB(HD-DVD and BlueRay Enhanced VOB)Tutorial: EVOB to MP3
FLAC(Free Lossless Audio Codec)Tutorial: FLAC to MP3
FLV(Flash Video)Tutorial: FLV to MP3
HDTV(High Definition Video)Tutorial: HDTV to MP3
M4A(MPEG-4 Audio)Tutorial: M4A to MP3
MKV(Matroska Video)Tutorial: MKV to MP3
MOV(QuickTime Movie)Tutorial: MOV to MP3
MP3(MPEG Layer-3)Tutorial: MP3 to MP3
MP4/M4V(MPEG-4 Video)Tutorial: MP4/M4V to MP3
MPA(MPEG Audio)Tutorial: MPA to MP3
MPC(Musepack)Tutorial: MPC to MP3
MPEG-1(MPEG-1 Video)Tutorial: MPEG-1 to MP3
MPEG-2(MPEG-2 Video)Tutorial: MPEG-2 to MP3
NUV(MythTV)Tutorial: NUV to MP3
OFR(OptimFROG Audio)Tutorial: OFR to MP3
OGG(OGG Vorbis Audio)Tutorial: OGG to MP3
OGM(OGG Media)Tutorial: OGM to MP3
PVA(Hauppauge Video Recording)Tutorial: PVA to MP3
RA(RealAudio)Tutorial: RA to MP3
RM(RealMedia)Tutorial: RM to MP3
SD2(Sound Designer 2)Tutorial: SD2 to MP3
SHN(Shorten Audio)Tutorial: SHN to MP3
SND(Unix Sound)Tutorial: SND to MP3
SVCD(Super VCD)Tutorial: SVCD to MP3
TTA(The True Audio codec)Tutorial: TTA to MP3
VCD(VideoCD 2.0)Tutorial: VCD to MP3
VOB(DVD Media File)Tutorial: VOB to MP3
VRO(DVD-Recording)Tutorial: VRO to MP3
WAV(Waveform)Tutorial: WAV to MP3
WMA(Windows Media Audio)Tutorial: WMA to MP3
WMV(Windows Media Video)Tutorial: WMV to MP3
WV(WavPack)Tutorial: WV to MP3
XVID(XVID Video)Tutorial: XVID to MP3

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