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dirac-announce — Announcements and news for the Dirac video codec
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From: Dirac <dir...@rd...> - 2009-02-12 05:14:50
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Dirac 1.0.2 has been released. The release tarball can be downloaded from http://diracvideo.org/download/dirac-research or http://sourceforge.net/projects/dirac This a a minor release complying with the latest Dirac Bytestream Specification 2.2.3. Changes in this release include -Improved compression performance for small picture sizes and at low bit-rates. -Included macros to check the API version. -Improved motion estimation. -New 422 <-> 420 conversion utilities for interlaced video. -Fixed bugs in handling DC subband. The following utilities have also been released. -Updated version of the DirectShow filter to be able to play back Dirac raw bytestreams or Dirac muxed in AVI in Windows Media Player and MPlayer Classic. The filter installer can be downloaded from the Dirac project page on Sourceforge or from http://diracvideo.org/download/dirac-research/directshow -The source and win32 binary of ffmpeg2dirac, a utility that can transcode any multimedia format that can be decoded by FFmpeg into Dirac video and Vorbis audio (if audio exists) muxed in Ogg. The source and the win32 binary can be downloaded from the Dirac project page on Sourceforge or from http://diracvideo.org/download/ffmpeg2dirac Note that new patches for MPlayer and FFmpeg will no longer be released because Dirac support via Dirac and Schroedinger libraries is available in FFmpeg. Latest information on Dirac and associated projects can be found at http://diracvideo.org |
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From: Dirac <dir...@rd...> - 2008-09-16 18:54:39
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Dirac 1.0.0 has been released. The release tarball can be downloaded from http://diracvideo.org/download/dirac-research or http://sourceforge.net/projects/dirac Dirac Compression System ------------------------- Dirac is a video compression system that provides general-purpose video compression and decompression tools comparable with state-of-the-art systems. Dirac is a format and compression technology, not a specific codec. The most important part of the Dirac project is the specification which can be found at http://diracvideo.org/specifications Dirac Project ------------- The initial implementation of Dirac at resulted in a research implementation which is referred to as the Dirac codebase. It is now called dirac-research. It is a reference implementation and also a codebase for future algorithmic developments. Dirac 1.0.0 is the release of this codebase. Dirac website ------------- Information about Dirac and the associated projects can be found at http://diracvideo.org What's new in this release -------------------------- Several alpha and beta releases have preceded this release. The changes in 1.0.0 release are: - Compliance with Dirac Bytestream specification 2.2.2 - Adaptive GOP structure - Improved motion estimation. - Improved pre-filtering. - Major code refactor of encoder classes. - Added conversion utility for horizontal 3/4 filtering. - DirectShow Filter released to be able to play back Dirac v2.2.2 files raw bytestreams and Dirac wrapped in AVI in Windows Media Player and MPlayer Classic. Dirac website ------------- Information about Dirac and the associated projects can be found at http://diracvideo.org Dirac content creation and playback ----------------------------------- Information on the end-user applications that support Dirac can be found at http://diracvideo.org/wiki/index.php/Main_Page#End_user_applications_that_support_Dirac_video |
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From: Dirac <dir...@rd...> - 2008-06-04 08:09:49
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This a beta release complying with the latest Dirac Specification 2.2.0. - Added support for Ultra High Definition video formats. - Improved compression efficiency in both constant quality and constant bit-rate modes. - Fixed major bugs that caused the encoder to crash or the decoder to go into a permanent loop. - Dirac support is now directly available in FFmpeg via the external Dirac and/or Schroedinger libraries. Hence there is no FFMpeg patch in this release. - Released new patches for MPlayer to enable Dirac playback. - DirectShow Filter released to be able to play back Dirac v2.2.0 files - Modified Programmer's guide to reflect changes to the API. - Bugs fixed: 1944681, 1906788, 1893223, 1874587 |
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From: Thomas D. <Tho...@bb...> - 2008-04-02 15:07:54
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There are new versions of the Dirac specification available on the Dirac website, http://dirac.sourceforge.net/specification.html DiracPro/VC-2 has moved to version 1.1. Changes are: - a number of corrections and elucidations - definitions of VC-2 profiles and a default level. Dirac has moved to version 2.2. Changes are: - corrections as per DiracPro 1.1 - definitions of VC-2 profiles and the default VC-2 level - a draft definition of a long-GOP coding profile - a draft definition of a default long-GOP level - specification of conditions for random access Thomas http://www.bbc.co.uk/ This e-mail (and any attachments) is confidential and may contain personal views which are not the views of the BBC unless specifically stated. If you have received it in error, please delete it from your system. Do not use, copy or disclose the information in any way nor act in reliance on it and notify the sender immediately. Please note that the BBC monitors e-mails sent or received. Further communication will signify your consent to this. |
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From: Dirac <di...@rd...> - 2008-01-26 13:50:10
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This is a minor release complying with Dirac Bytestream Specification 2.1.0. - Corrected the motion compensation block weighting matrix. - Fixed bug in constant bit rate module when encoding I-frame only sequences - Bug fixes in MPlayer and FFmpeg patches and Dirac DirectShow Filter |
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From: Dirac <di...@rd...> - 2008-01-23 04:31:19
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Major release complying with the latest Dirac Bytestream Specification Dirac 2.0.0. The specification document can be downloaded from http://dirac.sourceforge.net/specification.html - Added support for VC-2 Core Syntax (Dirac 1.0.0) - Improved quantiser selection, motion compensation and constant bit-rate coding performance. - Fixed bugs in constant bit-rate coding mode, dc value prediction in motion decoding, handling concatenated Dirac bytestreams. - API changes to conform with spec revision 2.0.0. Applications using Dirac libraries will need to be recompiled. - Released patches to MPlayer, FFmpeg to comply with this release. Earlier patch to transcode can be used with release. - DirectShow Filter released to be able to play back Dirac v2.0.0 files in Windows Media Player. |
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From: Dirac <di...@rd...> - 2007-10-02 11:36:25
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This is a major release complying with Dirac Bytestream Specification 1.0.0_pre9. - Added support for interlaced coding - Added support for full-search block matching. - Improved constant bit-rate coding mode - Improved motion estimation - Added support for larger wavelet-depths in non-MMX mode. - API changes to conform with spec revision 1.0.0.pre9_02. Application using Dirac libraries will need to be recompiled. - Released patches to MPlayer, FFmpeg to comply with this release. Earlier patch to transcode can be used with release. - DirectShow Filter released to be able to play back Dirac v0.8.x files in Windows Media Player - Minor bug fixes. -- |
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From: Dirac <di...@rd...> - 2007-05-09 16:24:06
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This is a major release complying with Dirac ByteStream Specification 1.0.0_pre4. The specification is available on the Dirac Homepage on Sourceforge. Major features of this release are - Compliance with latest Dirac Specification - Added support for Constant Bit Rate Coding. - Improved quality of encoded pictures at low bit-rates and for difficult sequences. - Improved arithmetic coding and motion vector data partitioning - Encoder and Decoder API header files have changed so applications using the old API will have to be recompiled. - Released patches to MPlayer, FFmpeg to comply with this release. Earlier patch to transcode can be used with this release. - DirecShow Filter released to be able to play back Dirac v0.7.0 files in Windows Media Player. - Bugs fixed: 1362673, 1508532, 1588191 - Patches applied: 1537623 -- |
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From: Dirac <di...@rd...> - 2006-06-22 13:34:18
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The latest version of the Dirac Specification has been uploaded to the Dirac Home page on Sourceforge. The specification can be found at http://dirac.sourceforge.net/specification.html -- |
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From: Dirac <di...@rd...> - 2006-06-13 13:33:33
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This is a major release with the following features. - Complies with latest Dirac specification. The latest Dirac specification will soon be uploaded to the Dirac documentation website. - Encoder and Decoder API have changed to comply with specification - Released new patches for MPlayer and FFmpeg to comply with this release. - New version of DirectShow filter released to be able to play back Dirac 0.6.0 files in Windows Media Player - Bugs fixed: 1501636, 1383890 -- |
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From: Dirac <di...@rd...> - 2006-05-03 16:30:25
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The Dirac team is pleased to announce our involvement as a mentor organisation in Google's Summer of Code 2006 program. Details are available at http://dirac.sourceforge.net/soc2006.html -- |
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From: Dirac <di...@rd...> - 2005-12-05 14:47:28
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This is a minor release with the following changes - Includes support for lossless encoding. - Improved Decoder performance by upto 20%. - Improved encoder performance - Several bug fixes and patches applied. - New patch released for latest FFMpeg cvs version dated 05-Dec-2005 and for latest release of MPlayer. - The DirectShow filter released for earlier versions of Dirac can be used with Dirac 0.5.4 as well Note that Dirac files created using Dirac-0.5.3 can be decoded using Dirac 0.5.4. -- |
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From: Dirac <di...@rd...> - 2005-08-23 12:42:55
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This is a minor release with the following changes: - Improved decoder speedup - Improved motion estimation - Improved chroma fidelity - Several bug fixes Note that the bitstream has changed in this release. So the files encoded using earlier releases are not compatible with this release. Along with the new version of Dirac, patches/utilties for support in various video players/processing tools have also been released. These include - Directshow Filter to enable dirac playback on MSWindows using the windows media player. - Patch for FFMPEG - Patch for MPlayer-1.0.pre7 - Patch for transcode-1.0.0 -- |
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From: Dirac <di...@rd...> - 2005-05-25 14:37:11
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This is a minor release with the following changes: - Improved decoder speedup by 20% - Included support for multiple wavelet filter types - Included support for variable motion vector precision. - Modified encoder utility command line interface. Refer to section 4.3 in README for further details. - Patches provided on project page to include dirac support in the latest releases of MPlayer, ffmpeg and transcode. - Minor bug fixes Note that the bitstream has changed in this release. So the files encoded using earlier releases are not compatible with this release. -- |
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From: Christian F. K. S. <ur...@li...> - 2005-03-31 12:04:49
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Hi everyone, The organizers of GUADEC this year got a venue that was bigger than what was needed for the planned GNOME related activities, so I was allowed to add a general multimedia track to the list of talks normally presented at GUADEC. So after working to get the speakers in place I am now ready to announce the multimedia track. The track will focus on Open Source and Free Software Multimedia in general and most of the talks featured are not GNOME specific at all. So I invite all members of the Free and Open Source multimedia communities to attend GUADEC this year to enjoy the multimedia track. Featured talkers include Ralph Giles from Xiph.org, Conrad Parker from CSIRO talking about Annodex, Thomas Davies from the BBC talking about Dirac, Wim Taymans from Fluendo talking about GStreamer and many more. You find a full presentation of talks here: http://2005.guadec.org/conference/multimedia.html A full GUADEC schedule including the Multimedia track with times and dates can be found here: http://2005.guadec.org/schedule/ So hope to see as many of you as possible at GUADEC in Stuttgart, Germany this May. General information on when,where and how is on the GUADEC website. Sincerely, Christian |
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From: Anuradha S. <anu...@rd...> - 2005-02-17 16:27:01
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A Directshow filter for Dirac has been released to enable playback of Dirac encoder files using Windows Media Player. Installation instructions are available in the zipped archive on the Dirac project page. The zipped file can be downloaded from http://prdownloads.sourceforge.net/dirac/DiracSplitter-0.5.1.zip? download -- |
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From: Anuradha S. <anu...@rd...> - 2005-02-17 16:24:57
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A patch for MPlayer-1.0pre6a has been released to enable playback to Dirac encoded files. The patch can be downloaded from the Dirac project page on Sourceforge. http://prdownloads.sourceforge.net/dirac/MPlayer-1.0pre6a_dirac-0.5.1.patch.tgz?download -- |
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From: Dirac <di...@rd...> - 2005-02-17 16:22:51
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This is a minor release with several algorithmic improvements and bug fixes. Note that the bitstream has changed, so files encoded using earliers version of Dirac cannot be decoded using this version. Some of the main improvements are - Significant speedup in the Arithmetic coding and decoding engines - Improved compression performance and decoding speed - MMX optimisation in Motion estimation resulting in improved encodin speed - Released a patch for MPlayer-1.0pre6a to enable it to play back Dirac encoded files. The patch can be downloaded from the Dirac project page on Sourceforge. - Released DirectShow filter for Dirac to enable playback of Dirac bitstreams using Windows Media Player. The patch can be downloaded from the Dirac project page on Sourceforge. -- |
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From: Dirac <di...@rd...> - 2004-12-01 17:26:45
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This ia a major release with new features and algorithmic improvements. The major changes are - Encoder "C" interface - Several algorithmic improvements - Several bug fixes. - Support for build under MS Windows using MS VC++ .NET 2003 - Static and shared library builds using libtool under UNIX and GNU/Linux - Libraries restructured so that only two libraries are created - one for the encoder and one for the decoder. Regards Anuradha Suraparaju -- |
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From: Anuradha S. <anu...@rd...> - 2004-11-02 10:28:43
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The Dirac website has moved to http://dirac.sourceforge.net. Please update your bookmarks to point to this site. This new site contains the documentation required by developers, download information etc. A TODO list has been included in the documentation to map current and future Dirac Development. The old site, http://www.bbc.co.uk/rd/projects/dirac, hosted at BBC R&D will be modified to give an overview on Dirac but all the developer resources (documentation, download info etc) will be maintained only at the new Dirac website. |
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From: Dirac <di...@rd...> - 2004-09-21 14:10:30
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This is a minor release with the following enhancements and bug fixes - Quality metric has changed from PSNR to one based on 4th powers of errors. This results in pictures with more stable quality and fewer artefacts. - Fixed bug with scaling motion vectors for non 4:4:4 formats. - Fixed bug in encoder in downconverting a picture with odd valued dimensions - Fixed bug in encoder in handling input with 4:1:1 chroma format. - Fixed bug in diagnostics tool in handling input with 4:1:1 chroma format. - Updated algorithm documentation |
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From: Dirac <di...@rd...> - 2004-09-10 21:56:43
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This is a minor release with the following bug fixes - Fixed bugs in writing instrumentation data while encoding which caused the diagnostics tool to go into an infinite loop - Fixed bug in diagnostic tool - Fixed bug with setting DC band perceptual weight and calculating bit rate. |
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From: Anuradha S. <anu...@rd...> - 2004-09-10 17:53:59
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This is a minor release with the following bug fixes - Fixed bugs in writing instrumentation data while encoding which caused the diagnostics tool to go into an infinite loop - Fixed bug in diagnostic tool - Fixed bug with setting DC band perceptual weight and calculating bit rate. |
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From: Anuradha S. <anu...@rd...> - 2004-08-26 12:10:35
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This is a minor release with the following fixes/new features. - Added support for build under Microsoft Windows using gnu autotools, MSYS and no-cost MS VC++ 2003 compiler - Fixed bug in building unit tests when older versions of cppunit are installed - Fixed bugs in measurement of PSNR and motion estimation process |
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From: Anuradha S. <anu...@rd...> - 2004-08-19 16:18:49
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This version is a major release and contains many improvements over version 0.3.x. The main features are - Added constant quality encoding interface using PSNR as the quality measure, and using multi-pass frame coding - Implemented unique frame headers to facilitate bit-stream parsing. The document describing the syntax of Dirac bitstream v0.1 is included in the doc directory. - Added C interface for the decoder application to allow interfacing to player software. Refer to the api documentation in dirac_parser.h. - Added Intra-frame insertion and cut detection - Added instrumentation output from encoder and an instrumentation display tool for visualising encoder decisions to help with algorithmic development - Added a unit testing framework based on cppunit for testing classes - Added feature to encode only a section of input video rather than the whole sequence - Tweaked motion estimation parameters to improve performance, mostly for higher-res pictures - Fixed bug with vertical block separation always being set to 8 pixels - Fixed bug 1008694 (Out-of-tree building fails) - Fixed header and pkconfig installation - Cleansed and refactored numerous code files to add comments, improve readability and modularity |