Converting
These tools help you to convert from one audio format to another.
dBpoweramp Music Converter $36 
- Huge range of audio codecs supported: mp3, mp4, m4a (AAC, iTunes & iPod), Windows Media Audio (wma), Ogg Vorbis and FLAC
- Preservation of ID Tags and Album Artwork, correct mapping of ID Tags between tag types (where possible),
- Multi-CPU encoding support,
- Easy folder & drive selection with Batch Converter,
- Sample rate conversion,
- DSP effect support (ReplayGain, Volume Normalize, including DirectX and VST effects),
- Pro-orientated codecs: BWF Wave, Dalet, mp2
- Windows Explorer integration: audio info tips & columns
Converting to a different bit depth and sample rate
fre:ac
fre:ac is a free audio converter and CD ripper with support for various popular formats and encoders. It converts freely between MP3, M4A/AAC, FLAC, WMA, Opus, Ogg Vorbis, Speex, Monkey's Audio (APE), WavPack, WAV and other formats.
With fre:ac you easily rip your audio CDs to MP3 or M4A files for use with your hardware player or convert files that do not play with other audio software.
You can even convert whole music libraries retaining the folder and filename structure.
The integrated CD ripper supports the CDDB/GNUdb online CD database.
Available for all major operating systems.
Multilingual user interface available in 43 languages.
Completely free and open source without a catch.
Switch Audio File Conversion Software €20
Switch audio file conversion software is a sound file format converter for Windows or Mac. Convert audio files from many different file formats into mp3, wav or wma files such as wav to mp3, mp3 to wav, wma to mp3 and much more. This audio file converter is easy to use. Just add the files you want to convert, select the output format, and then click convert.
Switch is not a simply mp3 converter, it is the most comprehensive and stable audio file converter around. With Switch you can convert your sound files into the formats you need to compress for storage, create ringtones, add to a presentation, listen on your portable device and much more. In fact, the possibilities are endless using this powerful audio converter.
Converts a variety of audio file formats to mp3 or wav such as:
- wav, mp3, wma, mp2,
- m4a, ogg, avi, mid
- flac, aac, mpga, dct,
- au, aiff, ogg, raw,
- msv, dvf, vox, cda,
- atrac, gsm, dss, sri
- shn, dss, msv, wmv
- wav, mp3, au
- aif/aiff, gsm, vox
- raw, ogg, flac
- aac, mp2, m4a,
- .mov, .amr
- and many more formats.
Trader's Little Helper
Trader's Little Helper has been designed to easily handle repetitive tasks traders of lossless audio files have to deal with, for example decoding, encoding, verifying and creating checksums, fixing sector boundary errors, or creating torrent files.
- Encoding of wav files to ape, flac, shn and mp3 format
- Re-encoding of flac files
- Decoding of ape, flac, mkw, shn, mp2 and mp3 files to wav format
- Direct conversion of ape, flac, mkw and shn files to flac or mp3 format
- Test of audio files encoded in ape, flac, shn and mkw format
- Verification of cfp, ffp, md5, sfv and st5 checksum files
- Creation of cfp, ffp, md5, sfv and st5 checksum files
- Display of audio file properties (ape, flac, shn, mkw and wav files)
- Fixing of sector boundary errors that come with ape, flac, shn, mkw, wav and mp3 files
- Removal of extra RIFF chunks in audio files
- Rewriting of WAVE headers to canonical format
- Creation of skt files for non-seekable shn files
- Test of wav files for mp3 source
- Creation of torrent files
- Display of the information encoded in torrent files
- Hashing of torrent files against local filesets or files
- Drag & Drop functionality for all supported file types
- Integration into Windows Explorer
- Check for update function
To achieve this functionality Trader’s Little Helper mostly acts as a frontend for the following lossless audio console applications (which are packaged with this installer):
- aucdtect v0.8.2
- flac v1.2.1
- lame v3.97
- mac v3.99
- mkwcon v1.0.2 (with mkwm4.drv)
- shntool v3.0.4
- shorten v3.6.1
Xrecode is freeware
xrecode II is converter and audio-grabber which allows you to convert from mp3, mp2, wma, aiff, amr, ogg, flac, ape, cue, ac3, wv, mpc, mid, cue ,tta, tak, wav, wav(rf64), dts, m4a, m4b, mp4, ra, rm, aac, avi, mpg, vob, mkv, mka, flv, swf, mov, ofr, wmv, divx, m4v, spx, 3gp, 3g2, m2v, m4v, ts, m2ts, adts, shn, tak, xm, mod, s3m, it, mtm, umx, mlp to m4a, alac, ape, flac, mp3, mp4 (using NeroAAC), ogg, raw, wav, wav(rf64), wma, WavPack, mpc, mp2, Speex, ofr, ac3, aiff, tak and Shorten formats. Command Line parameters are supported.
SoX
SoX is a cross-platform (Windows, Linux, MacOS X, etc.) command line utility that can convert various formats of computer audio files in to other formats. It can also apply various effects to these sound files, and, as an added bonus, SoX can play and record audio files on most platforms.
Sox is often used for on the fly sample rate conversion.
Freeware.
A guide
LAME
LAME is a high quality MPEG Audio Layer III (MP3) encoder licensed under the LGPL.
LAME is considered the best MP3 encoder at mid-high bitrates and at VBR.
- MPEG1,2 and 2.5 layer III encoding.
- CBR (constant bitrate) and two types of variable bitrate, VBR and ABR.
- Encoding engine can be compiled as a shared library (Linux/UNIX), DLL , Directshow filter or ACM codec (Windows).
- Free format encoding and decoding.
- GPSYCHO: a GPL'd psycho acoustic and noise shaping model.
- Powerful and easy to use presets.
- Quality better than all other encoders at most bitrates.
- Fast! Encodes faster than real time on a PII 266 at highest quality mode.
- MP3x: a GTK/X-Window MP3 frame analyzer for both .mp3 and unencoded audio files.
TAudioConverter
TAudioConverter is a audio converter and extractor. It can convert almost any audio format to aac, ac3, mp3, flac, wav, ogg, opus or mpc. SoX is used to apply effects such as normalization, volume change etc. It can also extract audio streams from video files and encode them. Video files with more than one audio stream is supported.
It is possible to run up to 8 simultaneous processes to shorten encoding time.
TAudioConverter uses:
-FFMpeg to extract and decode audio streams.
-FAAC
-QAAC
-Lame
-OggEnc
-FLAC
-FHGAACEnc
-Opus
-MPCEnc
A tread on Hydrogenaudio.