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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. Audacity has very robust crash recovery and in many cases can recover most or all of your work in the event of a power failure, computer crash or crash of Audacity itself. However it is a wise precaution to backup the project periodically to a separately named AUP3 file in case Audacity is unable to recover correctly. Audacity-devel Opus format WAS Re: Reported libavcodec vulnerabilities in FFmpeg pre 1.0 Audacity-devel Opus format WAS Re: Reported libavcodec vulnerabilities in FFmpeg pre 1.0. I just tried again on full orchestra comparing with MP3 VBR 8 and OGG quality 2 to give similar file sizes. The Opus sounds a bit brighter than both and has. Opus uses an algorithm based on audio bandwidths rather than sample rates. See RFC 6716, section 2 for details. In addition, there is an optional part of the Opus specification (Opus Custom) that does allow for non-standard sample rates, but the use of this feature is discouraged. Audacity has very robust crash recovery and in many cases can recover most or all of your work in the event of a power failure, computer crash or crash of Audacity itself. However it is a wise precaution to backup the project periodically to a separately named AUP3 file in case Audacity is unable to recover correctly.

LAME is a software encoder that converts a digitized WAV audio file into the MP3audio coding file format. LAME is a free software project that was first released in 1998, and has incorporated many improvements since then, including an improved psychoacoustic model. The LAME encoder outperforms early encoders like L3enc.^[3]

LAME was required by some programs released as free software in which LAME was linked for MP3 support, but the patent has expired. This avoided including LAME itself, which use patented techniques, and so required patent licenses in some countries. For instance, it is now bundled with Audacity),^[4]

History[edit]

The name LAME is a recursive acronym for 'LAME Ain't an MP3 Encoder'.^[5]

Around mid-1998, Mike Cheng created LAME 1.0 as a set of modifications against the '8Hz-MP3' encoder source code. After some quality concerns raised by others, he decided to start again from scratch based on the 'dist10' MPEG reference software sources. His goal was only to speed up the dist10 sources, and leave its quality untouched. That branch (a patch against the reference sources) became Lame 2.0. The project quickly became a team project. Mike Cheng eventually left leadership and started working on tooLAME (an MP2 encoder).

Mark Taylor then started pursuing increased quality in addition to better speed, and released version 3.0 featuring gpsycho, a new psychoacoustic model he developed.

A few key improvements, in chronological order:

• May 1999: a new psychoacoustic model (gpsycho) is released along with LAME 3.0.
• June 1999: The first variable bitrate implementation is released. Soon after this, LAME also became able to target lower sampling frequencies from MPEG-2.
• November 1999: LAME switches from a GPL license to an LGPL license, which allows using it with closed-source applications.
• May 2000: the last pieces of the original ISO demonstration code are removed. LAME is not a patch anymore, but a full encoder.
• December 2003: substantial improvement to default settings, along with improved speed. LAME no longer requires users to enter complicated parameters to produce good results.
• May 2007: default variable bitrate encoding speed is vastly improved.

Patents and legal issues[edit]

Like all MP3 encoders, LAME implemented techniques covered by patents owned by the Fraunhofer Society and others. The developers of LAME did not license the technology described by these patents. Distributing compiled binaries of LAME, its libraries, or programs that derive from LAME in countries where those patents have been granted may have constituted infringement, but since 23 April 2017, all of these patents have expired.^[6][7]

Audacity Opus Download

The LAME developers stated that, since their code was only released in source code form, it should only be considered as an educational description of an MP3 encoder, and thus did not infringe any patent in itself. They also advised users to obtain relevant patent licenses before including a compiled version of the encoder in a product.^[8] Some software was released using this strategy: companies used the LAME library, but obtained patent licenses.

In the course of the 2005 Sony BMG copy protection rootkit scandal, there were reports that the Extended Copy Protectionrootkit included on some SonyCompact Discs had portions of the LAME library without complying with the terms of the LGPL.^[9][10][11]

Audacity Opus Import

See also[edit]

• MP3, ID3

Audacity Importing Mp4

References[edit]

1. ^'History'. Archived from the original on |archive-url= requires |archive-date= (help). Retrieved 15 October 2017.
2. ^http://lame.cvs.sourceforge.net/viewvc/lame/lame/COPYING?revision=1.2&view=markup
3. ^'Opus FAQ'. This is what made it possible for modern MP3 encoders (e.g. LAME) to improve far beyond the original L3enc and dist10 reference implementations.
4. ^Lendino, Jamie (27 September 2019), 'Audacity Review', PC Magazine
5. ^'LAME MP3 Encoder :: About'. Lame.sourceforge.net. Retrieved 17 March 2012.
6. ^'mp3'. Fraunhofer IIS. Fraunhofer IIS. Retrieved 2 May 2017.
7. ^'Alive and Kicking: MP3 software, patents and licenses (Fraunhofer Audio Blog)'. Fraunhofer Audio Blog. Fraunhofer IIS. 18 May 2017. Retrieved 19 May 2017. The licensing program coming to an end is due to the fact that the last patent included in the program expired. The page's later caution about third-party implementation–specific patents is not about LAME's implementation.
8. ^http://lame.sourceforge.net/tech-FAQ.txt
9. ^Reuters (21 November 2005). 'Sony BMG Software May Contain Open-Source Code'. Fox News. Retrieved 26 November 2011.CS1 maint: uses authors parameter (link)
10. ^'Is Sony in violation of the LGPL?'. The-interweb.com. Retrieved 17 March 2012.
11. ^'Sony's XCP DRM'. Archived from the original on 24 November 2005.

External links[edit]

• LAME binaries - RareWares
• LAME binaries for Audacity - recommended for the Audacity free and GPL audio editor
• LAME Wiki - HydrogenAudio