What is TTA? True Audio Lossless Format Explained
An open, real-time lossless audio codec for compact, bit-perfect archival.
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What is TTA?
TTA, short for True Audio, is a free, open-source lossless audio codec created by Aleksander Djuric. It compresses PCM audio with no loss of quality, producing files that decode back to a bit-perfect copy of the original while typically reducing size to roughly 30 to 70 percent of the source.
TTA achieves compression using adaptive predictive filtering followed by entropy coding, an approach broadly comparable to FLAC and Monkey's Audio. It is designed for real-time encoding and decoding, supports 8-, 16-, and 24-bit multichannel audio, and can store metadata in ID3 or APEv2 tags. The codec also offers optional password protection and encryption, and can be carried inside containers such as Matroska.
How TTA Works
True Audio compresses PCM with adaptive predictive filtering followed by entropy coding, an approach broadly comparable to FLAC and Monkey's Audio that reconstructs a bit-perfect copy of the original.[1] It is engineered for fast, real-time encoding and decoding and supports 8-, 16-, and 24-bit multichannel audio.[1]
History and Standardization
TTA is a free, open-source lossless codec created by Aleksander Djuric, listed among the established lossless audio coding formats.[3] It can store metadata in ID3 or APEv2 tags and be carried inside containers such as Matroska, broadening its compatibility with media players.[2]
TTA vs Other Lossless Codecs
Compression typically reduces files to roughly 30 to 70 percent of the source, similar in range to peers like FLAC.[1] A distinguishing feature is optional password protection and encryption, which most lossless codecs omit, though TTA sees narrower hardware and software support than FLAC.[2]
MKV Technical Specifications
TTA vs Other Audio Formats
| Feature | TTA | FLAC | WAV |
|---|---|---|---|
| Compression | Lossless[1] | Lossless | Uncompressed |
| Quality | Bit-perfect[3] | Bit-perfect | Bit-perfect |
| License | Open[2] | Open | Open |
| File size | Smaller than WAV[1] | Smaller than WAV | Largest |
| Device support | Limited | Wide | Wide |
| Best for | Lossless archiving | Lossless archiving | Editing |
TTA delivers lossless compression similar to FLAC but enjoys far less player and hardware support.
Advantages & Disadvantages
Advantages
TTA reconstructs the original PCM audio exactly while cutting file size substantially, making it well suited to archival.
The codec and its reference library are released under GPL/LGPL open-source licenses with freely available source code.
Its lightweight design allows real-time encoding and decoding, even on modest hardware and portable players.
TTA optionally supports password protection and encryption, a feature many other lossless codecs lack.
Disadvantages
TTA is less widely supported than FLAC, so some players and devices may need plugins or conversion to handle it.
Its compression ratios are similar to FLAC rather than clearly better, giving little incentive to switch for many users.
The reference encoder targets up to six channels, so very-high-channel-count workflows may need other tools.
Common Use Cases
TTA is used where bit-perfect storage and open tooling matter, especially for music.
Lossless music archives | FileFormer
TTA stores CD rips and master recordings losslessly at reduced size for long-term collections.
Live and concert recordings | FileFormer
Its real-time encoding and optional encryption suit capturing and protecting long live performance recordings.
Portable lossless playback | FileFormer
Lightweight decoding lets TTA play back on resource-constrained players and embedded devices.
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Try Audio Converter FreeFrequently Asked Questions
What does TTA stand for?
TTA stands for True Audio, the name of both the lossless codec and its file format created by Aleksander Djuric.
Is TTA really lossless?
Yes. TTA uses lossless adaptive prediction and entropy coding, so decoding always reproduces the original audio samples exactly.
How does TTA compare to FLAC?
TTA offers similar lossless compression ratios and speed to FLAC, but adds optional encryption while having a smaller support ecosystem.
Is TTA free to use?
Yes. The TTA encoder, decoder, and library are open source under GPL/LGPL licenses, and the format is free to use.
Does TTA support metadata tags?
Yes. TTA files can carry metadata using ID3v1, ID3v2, or APEv2 tags for artist, title, album, and similar information.