CoreAVC
 | |
| Developer(s) | CoreCodec, Inc |
|---|---|
| Initial release | January 2, 2006 |
| Final release | 3.0.1.0 (September 9, 2011[1])[±] |
| Preview release | non[±] |
| Written in | Core-C (modularANSI C),C++ |
| Operating system | Windows,CE,Mobile;macOS,Linux(OEM only),Symbian,iOS,Palm OS,Android |
| Available in | English |
| Type | Codec |
| License | Proprietary |
| Website | corecodec |
CoreAVCwas aproprietarycodecfor decoding theH.264/MPEG-4 AVC(Advanced Video Coding) video format.
In 2010, when CoreAVC was a software-only decoder, it was one of the fastest software decoders, but still slower than hardware-based ones.[2]CoreAVC supports all H.264 Profiles except for 4:2:2 and 4:4:4.
From 2009, CoreAVC introduced support to two forms ofGPUhardware acceleration for H.264 decoding on Windows:CUDA(Nvidiaonly, in 2009) andDXVA(Nvidia and ATI GPUs, in 2011).
CoreAVC was included as a part of the CorePlayer Multimedia Framework and was being used in the now defunct desktop client byJoost[3]a system that was distributing videos over the Internet usingpeer-to-peer TV technology.
CoreAVC-For-Linux DMCA complaint
[edit]Anopen-sourceproject named CoreAVC-For-Linux hosted atGoogle Codepatches the loader code in the open sourcemedia playerprogramMPlayerand allows it to use the Windows only CoreAVCDirectShowfilter infree softwareenvironments. It doesnotinclude CoreAVC, but simply allows MPlayer to make use of it. This project also contains patches to use the proprietary codec inMythTV,open source software forHome Theater Personal Computersand the media playerxine.
In May 2008 the CoreAVC-For-Linux project was taken down by Google due to aDMCAcomplaint.[4]There was speculation about this DMCA complaint, because the project as a wrapper did not use any copyrighted material, but maybereverse engineeringtechniques were used without prior permission, which CoreCodec, Inc. interpreted as a violation of the DMCA.[5]CoreCodec has stated that reverse engineering was the reason, and it was in error[6]and has apologized to the community.[7]
CoreAVC-For-Linux is now back online and is recognized and supported by CoreCodec. Despite this, the project's future is currently in doubt as the developer stated they are quite busy and do not have enough time to continue working on it. The developer is currently requesting help from any developers interested in contributing to the project.[8]
Multi-platform support
[edit]In early 2008, due to popular demand, CoreCodec ported the until then Windows-only to a plethora of platforms and CPU architectures. CoreAVC is now supported on theoperating systemsWindows, macOS and Linux, as well as mobile-embedded operating systems like Palm OS, Symbian, Windows CE and Windows Mobile - although the Linux version is not available as retail but only forOEMs.CoreAVC runs not only on 32-bit and 64-bitx86,but also onPowerPC(includingAltiVecsupport),ARM9,ARM11andMIPS.As for GPUs, supported areIntel 2700G,ATIImageon,Marvell Monahan, (limited) Qualcomm QTv.
In February 2009, CoreCodec released an update to CoreAVC that implemented support forNvidiaCUDA.CUDA allows selected Nvidia graphics cards to assist in the decoding of video. In March 2011, CoreCodec introduced support forDXVA.Like CUDA, DXVA allows ATI and NVIDIA based graphics cards to assist in the decoding of video.[1]
References
[edit]- ^ab"CoreAVC Changelog".corecodec.Archived fromthe originalon 2 January 2017.Retrieved17 December2020.
- ^CoreAVC stronger than AVIVO & PureVideo?Archived2007-06-10 at theWayback Machine(April 2006)
- ^Joost - FAQ: TechnologyArchived2007-05-17 at theWayback Machine
- ^"CoreCodec complains of copied code".Chilling EffectsClearinghouse. 2008-04-30.Retrieved2008-05-05.
- ^"DMCA takedown of coreavc-for-linux/CoreCodec Homepage".Archivedfrom the original on 2008-05-09.Retrieved2008-05-09.
- ^DMCA takedown of coreavc-for-linux, message 5780(May 2008)
- ^DMCA takedown of coreavc-for-linux, message 5785(May 2008)
- ^"coreavc-for-linux".coreavc-for-linux. 2012-06-10.Retrieved2012-06-10.
