QDesign

QDesign

The QDesign Music Codec was originally LBpack, by Dmitry Shmunk. QDesign corporation bought the codec and hired the developer to create what would become the official audio compression in Apple Computer's QuickTime v3.

The codec's official name is "RaveSound", according to [http://www.qdesign.com/news/archives/01_06_98.htm this] press release. It's commonly called QDesign Codec. It is optimized to compress quite well at very low bitrates, but its aggressiveness introduces audible artifacts at higher bitrates.

The personal version comes with QuickTime Pro and allows encoding at bitrates up to 48 kbit/s. The professional version allows bitrates up to 128 kbit/s.

Apple is now steering away from proprietary codecs in QuickTime like Sorenson Video and QDesign, and focusing on standards (MPEG-4). In recent years, usage of QDMC has generally been eschewed in favor of AAC.

External links

* [http://www.qdesign.com/Products/about_products/qdmc_OSX.htm QDMC's site at QDesign]
* QDesign encoders are available at [http://www.rjamorim.com/rrw/ ReallyRareWares] .


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • QDesign Music Codec — (QDMC) ist ein proprietärer Codec zur verlustbehafteten Audiodatenkompression. Ursprünglich wurde er von Dmitry Shmunk unter dem Namen LBpack entwickelt. Die QDesign Corporation kaufte die Rechte und engagierte den Entwickler um es zum… …   Deutsch Wikipedia

  • Qdesign — n. program for compressing music files that has an extremely high compression rate (Computers) …   English contemporary dictionary

  • QDMC — QDesign Music Codec (QDMC) ist ein proprietärer Codec zur verlustbehafteten Audiodatenkompression. Ursprünglich wurde er von Dmitry Shmunk unter dem Namen LBpack entwickelt. Die QDesign Corporation kaufte die Rechte und engagierte den Entwickler… …   Deutsch Wikipedia

  • QDX — is an old lossy audio compression format, designed for portable multimedia players with small amount of memory.OverviewQDX files are encoded at 128 kbit/s but bitrate can be peeled so that lower bitrate stream can be extratced and saved on… …   Wikipedia

  • QuickTime — (Classic) …   Wikipedia

  • Codec listening test — A codec listening test is a scientific study designed to compare two or more lossy audio codecs, usually with respect to perceived fidelity or compression efficiency. Most tests take the form of a double blind comparison. Commonly used methods… …   Wikipedia

  • .mov — QuickTime Entwickler: Apple Aktuelle Version: 7.6 (21. Januar 2009) …   Deutsch Wikipedia

  • Apple QuickTime — QuickTime Entwickler: Apple Aktuelle Version: 7.6 (21. Januar 2009) …   Deutsch Wikipedia

  • Apple Quicktime — QuickTime Entwickler: Apple Aktuelle Version: 7.6 (21. Januar 2009) …   Deutsch Wikipedia

  • QuickTime Pro — QuickTime Entwickler: Apple Aktuelle Version: 7.6 (21. Januar 2009) …   Deutsch Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”