lossyWAV is a free, lossy pre-processor for PCM audio contained in the WAV file format. Proposed by David Robinson, it reduces bit depth of the input signal, which, when used in conjunction with certain lossless codecs, reduces the bitrate of the encoded file significantly compared to unpreprocessed compression. lossyWAV’s primary goal is to maintain transparency with a high degree of confidence when processing any audio data. ~ wiki.hydrogenaud.io/index.php?title=LossyWAV
lossyWAV is a near lossless audio processor which dynamically reduces the bit depth of the signal on a block-by-block basis. Bit Depth reduction adds noise to the processed output. The added noise is adaptively shaped by default and can alternatively be fixed noise shaped or white noise depending on command line parameters. When lossyWAV processed output is compressed with certain lossless codecs (FLAC, Wavpack, Tak, LPAC, MPEG-4 ALS and WMA-Lossless) the bitrate of the output file is significantly[1] reduced compared to the lossless original.
[1]: on average, depending on content.
hydrogenaud.io/index.php/topic,112649
wiki.hydrogenaud.io/index.php?title=LossyWAV#lossyWAV_and_foobar2000
github.com/corrideat/lossywav
github.com/MoSal/lossywav-for-posix
Tag Archives: Lossy
FAAC ~ Freeware AAC Encoder
FAAC is an Advanced Audio Coder (MPEG2-AAC, MPEG4-AAC). The goal of FAAC is to explore the possibilities of AAC and exceed the quality of the currently best MP3 encoders.
Features:
- High quality audio
- High-speed encoding
- Portable
- LC, Main, LTP support
- DRM support through DreaM
faac.sourceforge.net
sourceforge.net/projects/faac
en.wikipedia.org/wiki/FAAC
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WavPack ~ Hybrid Lossless Audio Compression
WavPack is a completely open audio compression format providing lossless, high-quality lossy, and a unique hybrid compression mode. For version 5.0.0, several new file formats and lossless DSD audio compression were added, making WavPack a universal audio archiving solution.
In the default lossless mode WavPack acts just like a WinZip compressor for audio files. However, unlike MP3 or WMA encoding which can affect the sound quality, not a single bit of the original information is lost, so there’s no chance of degradation. This makes lossless mode ideal for archiving audio material or any other situation where quality is paramount. The compression ratio depends on the source material, but generally is between 30% and 70%.
The hybrid mode provides all the advantages of lossless compression with an additional bonus. Instead of creating a single file, this mode creates both a relatively small, high-quality lossy file that can be used all by itself, and a “correction” file that (when combined with the lossy file) provides full lossless restoration. For some users this means never having to choose between lossless and lossy compression!
WavPack employs only well known, public domain techniques (i.e., linear prediction with LMS adaptation, Elias and Golomb codes) in its implementation. Methods and algorithms that have ever been patented (e.g., arithmetic coding, LZW compression) are specifically avoided. This ensures that WavPack encoders and decoders will remain open and royalty-free.
www.wavpack.com
github.com/dbry/WavPack
en.wikipedia.org/wiki/WavPack
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Opus ~ Interactive Audio Codec
Opus is a lossy audio coding format developed by the Xiph.Org Foundation and standardized by the Internet Engineering Task Force, designed to efficiently code speech and general audio in a single format, while remaining low-latency enough for real-time interactive communication and low-complexity enough for low-end embedded processors. Opus replaces both Vorbis and Speex for new applications, and several blind listening tests have ranked it higher-quality than any other standard audio format at any given bitrate until transparency is reached, including MP3, AAC and HE-AAC.
en.wikipedia.org/wiki/Opus_(audio_format)
opus-codec.org
opus-codec.org/downloads
github.com/xiph/opus/releases
Opus Tools ~ hydrogenaud.io/index.php/topic,124025
Opus Gapless ~ hydrogenaud.io/index.php?topic=116605.msg984924#msg984924
Opusrug ~ Based on opus 1.3.1-64 Good Opus encoder for Windows.(command line, you can use it with a GUI like Foobar2000 copying it in the encoders folder). You can also compile it for Linux, with the modified celtencoder.c.
github.com/fabiorug/Opusrug
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Ogg Vorbis ~ Free & Open Audio CODEC
Vorbis is a free and open-source software project headed by the Xiph.Org Foundation. The project produces an audio coding format and software reference encoder/decoder (codec) for lossy audio compression. Vorbis is most commonly used in conjunction with the Ogg container format and it is therefore often referred to as Ogg Vorbis. ~ en.wikipedia.org/wiki/Vorbis
Ogg Vorbis is a completely open, patent-free, professional audio encoding and streaming technology with all the benefits of Open Source.
www.vorbis.com
www.xiph.org/downloads
github.com/enzo1982/vorbis-aotuv-lancer
www.rarewares.org/ogg
www.rarewares.org/ogg-tools
nouturn.com/oggdrop
Ogg Forums At Hydrogen Audio
VorbisGain is a utility that uses a psychoacoustic method to correct the volume of an Ogg Vorbis file to a predefined standardized loudness.
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BatchEncoder ~ Audio Conversion GUI
BatchEncoder is audio file conversion software. It supports most of popular audio file formats including both lossy and lossless compression. The program is very simple to use. BatchEncoder is basically a GUI front-end for command-line tools. All it does is create background processes and pass arguments to it with options set in the presets / format menu and additionally adds input and output file paths.
Features:
- Open-source, fast and simple.
- Front-end for command-line tools.
- Supports popular audio formats.
- File transcoding between audio formats.
- Multi-threaded conversion.
- Full UNICODE support.
- Multi-language user interface.
- Out of the box configuration for new users.
- Advanced options for experienced users.
wieslawsoltes.github.io/BatchEncoder
github.com/wieslawsoltes/BatchEncoder
hydrogenaud.io/index.php/topic,50822.0
The Audio File 