Update of /cvsroot/dirac/compress/doc
In directory
sc8-pr-cvs12.sourceforge.net:/tmp/cvs-serv25282
Modified Files:
contact.html documentation.html faq.html
getting_involved.html
index.html licences.html overview.html specification.html
Log Message:
Sync with Sourceforge website changes. Include link to
licences info.
Change Schroedinger link from Sourceforge to
www.diracvideo.org.
Index: index.html
============================================================
=======
RCS file: /cvsroot/dirac/compress/doc/index.html,v
retrieving revision 1.5
retrieving revision 1.6
diff -C2 -d -r1.5 -r1.6
*** index.html 28 Sep 2006 17:13:19 -0000 1.5
--- index.html 12 May 2008 05:29:42 -0000 1.6
***************
*** 29,36 ****
</td>
</tr>
! <tr>
! <td>
! <a
href="overview.html"><img
src="images/arrow_right.gif"
! alt="Navigation item arrow"
/>Introduction</a>
</td>
</tr>
--- 29,36 ----
</td>
</tr>
! <tr>
! <td>
! <a href="http://s
onofid.blogspot.com"><img
src="images/arrow_right.gif"
! alt="Navigation item arrow"
/>Thomas's Blog</a>
</td>
</tr>
***************
*** 47,50 ****
--- 47,56 ----
</td>
</tr>
+ <tr>
+ <td>
+ <a href="http://ww
w.diracvideo.org/"><img
src="images/arrow_right.gif" alt=
+ "Navigation item arrow"
/>Schrodinger</a>
+ </td>
+ </tr>
<tr>
<td>
***************
*** 55,66 ****
<tr>
<td>
! <a
href="licences.html"><img
src="images/arrow_right.gif"
! alt="Navigation item arrow"
/>licences</a>
</td>
</tr>
<tr>
<td>
! <a
href="getting_involved.html"><img
src="images/arrow_right.gif" alt="Navigation
item arrow" />
! Getting involved</a>
</td>
</tr>
--- 61,70 ----
<tr>
<td>
! <a
href="licences.html"><img
src="images/arrow_right.gif" alt="Navigation
item arrow" />licences</a>
</td>
</tr>
<tr>
<td>
! <a
href="getting_involved.html"><img
src="images/arrow_right.gif" alt="Navigation
item arrow" />Getting involved</a>
</td>
</tr>
***************
*** 95,109 ****
<tr>
<td>
- <a
href="soc2006.html"><img
src="images/arrow_right.gif"
- alt="Navigation item arrow"
/>Summer of Code 2006</a> <span
- class="nav_sub"><br
/>
- <a
href="soc2006_ideas.html"><img src=
-
"images/arrow_right_indent.gif" alt=
- "Navigation item arrow"
/>Project ideas</a><br />
- </span>
- </td>
- </tr>
- <tr>
- <td>
<a href="http://source
forge.net"><img src=
"http://sourceforge.net/sflogo.php?group_id=
24405&type=1"
--- 99,102 ----
***************
*** 130,136 ****
Dirac is a video codec that provides
general-purpose
video compression and decompression
tools comparable with
! state-of-the-art systems. Dirac is
available for
distribution under the <a
href="http://mozilla.org/
MPL/">
! MPL version 1.1</a> software
license.
</p>
<p>
--- 123,161 ----
Dirac is a video codec that provides
general-purpose
video compression and decompression
tools comparable with
! state-of-the-art systems. Dirac is a
<i>format</i> and a compression
! technology, not a specific codec.
The most important
! part of the Dirac project is the
specification, which can
! be found <a
href="specification.html">here</a>.
! </p>
! <p>
! The purpose of the Dirac <a
href="http://sourceforge.net/projects/dirac/"&g
t;codebase</a>
! has changed over time. It
! is no longer intended as the basis
of a real-time practical
! implementation: for that you want
<a href="http://www.diracvideo.org/">Schrodinger</a&
gt;.
! </p>
! <p>
! Instead the Dirac project provides
reference code for Dirac.
! This is available for
distribution under the <a
href="http://mozilla.org/
MPL/">
! MPL version 1.1</a> software
license (and can be
! relicensed under LGPL and GPLv2). This is not
meant to
! be used in real systems, but to show the
capabilities of
! Dirac. We are currently developing a full
conformance test suite against
! which other implementations can be
tested.
! </p>
! <p>
! <a href="http://www.diracvideo.org/">Schrodinger</a&g
t;
! is a high-speed Dirac codec being
developed by
! Fluendo in partnership with the BBC.
The main developer is
! David Schleef, who developed the
<a href="http://liboil.freedesktop.org/wiki/">liboil
</a>
! optimisation library
! which is heavily used in the
project.
! </p>
! <p>
! Schro had just reached reached version 1.0: it's
very fast and its compression
! performance is beginning to get close to the
Dirac
! implementation. Schro is available as a set of
libraries
! and as a GStreamer plugin, under
! any of the GPLv2, LGPL, MIT or MPL
licences.
</p>
<p>
***************
*** 141,158 ****
"h
ttp://dirac.cvs.sourceforge.net/dirac">CVS
repository</a>.
</p>
! <p>
! For further information and a
history of the Dirac video
! codec, see the <a
href="overview.html">overview</a>
! section. There's detailed <a
href="documentation.html">
! documentation</a> for the
software API and the algorithm,
! also.
! </p>
! <p>
! Details on the license under which
Dirac is distributed
! can be found in the <a
href="licences.html">licences</a>
! section.
! </p>
! <p>
If you have a query or want to get
involved in developing
Dirac, please <a
href="contact.html">get in touch</a>.
--- 166,174 ----
"h
ttp://dirac.cvs.sourceforge.net/dirac">CVS
repository</a>.
+ There's detailed <a
href="documentation.html">
+ documentation</a> for the
software API for the reference
+ code and the algorithm also.
</p>
! <p>
If you have a query or want to get
involved in developing
Dirac, please <a
href="contact.html">get in touch</a>.
Index: specification.html
============================================================
=======
RCS file: /cvsroot/dirac/compress/doc/specification.html,v
retrieving revision 1.10
retrieving revision 1.11
diff -C2 -d -r1.10 -r1.11
*** specification.html 26 Jan 2008 11:42:08 -0000 1.10
--- specification.html 12 May 2008 05:29:43 -0000 1.11
***************
*** 30,39 ****
<tr>
<td>
- <a
href="overview.html"><img
src="images/arrow_right.gif"
- alt="Navigation item arrow"
/>Introduction</a>
- </td>
- </tr>
- <tr>
- <td>
<a href="http://s
onofid.blogspot.com"><img
src="images/arrow_right.gif"
alt="Navigation item arrow"
/>Thomas's Blog</a>
--- 30,33 ----
***************
*** 53,56 ****
--- 47,56 ----
</td>
</tr>
+ <tr>
+ <td>
+ <a href="http://ww
w.diracvideo.org/"><img
src="images/arrow_right.gif" alt=
+ "Navigation item arrow"
/>Schrodinger</a>
+ </td>
+ </tr>
<tr>
<td>
***************
*** 62,67 ****
<tr>
<td>
! <a
href="licences.html"><img
src="images/arrow_right.gif"
! alt="Navigation item arrow"
/>licences</a>
</td>
</tr>
--- 62,67 ----
<tr>
<td>
! <a
href="licences.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow"
/>licences</a>
</td>
</tr>
***************
*** 69,74 ****
<td>
<a
href="getting_involved.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow" />
! Getting involved</a>
</td>
</tr>
--- 69,73 ----
<td>
<a
href="getting_involved.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow" />Getting
involved</a>
</td>
</tr>
***************
*** 148,154 ****
</p>
<p>
! Dirac Specification Version 1.0.0
(Dirac Pro or VC-2)
<br />
! <a
href="DiracSpec1.0.0-DiracPro.pdf"><img
src=
"images/icon_pdf.gif"
alt="PDF" />pdf</a>
<br />
--- 147,153 ----
</p>
<p>
! Dirac Specification Version 1.1.0
(Dirac Pro or VC-2)
<br />
! <a
href="DiracSpec1.1.0-DiracPro.pdf"><img
src=
"images/icon_pdf.gif"
alt="PDF" />pdf</a>
<br />
***************
*** 157,172 ****
SMPTE format of choice, and may have
some minor conversion
errors. The Word version is available
! <a
href="DiracSpec1.0.0-DiracPro.doc">
here</a>.)
</p>
<p>
! The full Dirac specification has
reached version 2.1 and
! is the same as Dirac Pro version 1.0
except that it
also includes motion compensation so
that it is suitable
for distribution applications
(broadcasting and streaming)
also. It is available here:
<p>
! Dirac Specification Version 2.1.0
<br />
! <a
href="DiracSpec2.1.0.pdf"><img src=
"images/icon_pdf.gif"
alt="PDF" />pdf</a>
<br />
--- 156,171 ----
SMPTE format of choice, and may have
some minor conversion
errors. The Word version is available
! <a
href="DiracSpec1.1.0-DiracPro.doc">
here</a>.)
</p>
<p>
! The full Dirac specification has
reached version 2.2 and
! is the same as Dirac Pro version 1
except that it
also includes motion compensation so
that it is suitable
for distribution applications
(broadcasting and streaming)
also. It is available here:
<p>
! Dirac Specification Version 2.2.0
<br />
! <a
href="DiracSpec2.2.0.pdf"><img src=
"images/icon_pdf.gif"
alt="PDF" />pdf</a>
<br />
Index: licences.html
============================================================
=======
RCS file: /cvsroot/dirac/compress/doc/licences.html,v
retrieving revision 1.2
retrieving revision 1.3
diff -C2 -d -r1.2 -r1.3
*** licences.html 23 Jan 2008 00:39:41 -0000 1.2
--- licences.html 12 May 2008 05:29:42 -0000 1.3
***************
*** 30,35 ****
<tr>
<td>
! <a
href="overview.html"><img
src="images/arrow_right.gif"
! alt="Navigation item arrow"
/>Introduction</a>
</td>
</tr>
--- 30,35 ----
<tr>
<td>
! <a href="http://
sonofid.blogspot.com/"><img
src="images/arrow_right.gif"
! alt="Navigation item arrow"
/>Thomas's Blog</a>
</td>
</tr>
***************
*** 49,52 ****
--- 49,59 ----
<tr>
<td>
+ <a href="http://ww
w.diracvideo.org/"><img src=
+ "images/arrow_right.gif"
alt=
+ "Navigation item arrow"
/>Schrodinger</a>
+ </td>
+ </tr>
+ <tr>
+ <td>
<a
href="documentation.html"><img src=
"images/arrow_right.gif"
alt=
***************
*** 97,111 ****
<tr>
<td>
- <a
href="soc2006.html"><img
src="images/arrow_right.gif"
- alt="Navigation item arrow"
/>Summer of Code 2006</a> <span
- class="nav_sub"><br
/>
- <a
href="soc2006_ideas.html"><img src=
-
"images/arrow_right_indent.gif" alt=
- "Navigation item arrow"
/>Project ideas</a><br />
- </span>
- </td>
- </tr>
- <tr>
- <td>
<a href="http://source
forge.net"><img src=
"http://sourceforge.net/sflogo.php?group_id=
24405&type=1"
--- 104,107 ----
Index: getting_involved.html
============================================================
=======
RCS file:
/cvsroot/dirac/compress/doc/getting_involved.html,v
retrieving revision 1.5
retrieving revision 1.6
diff -C2 -d -r1.5 -r1.6
*** getting_involved.html 28 Sep 2006 17:13:19 -0000 1.5
--- getting_involved.html 12 May 2008 05:29:42 -0000 1.6
***************
*** 29,34 ****
<tr>
<td>
! <a
href="overview.html"><img
src="images/arrow_right.gif" alt=
! "Navigation item arrow"
/>Introduction</a>
</td>
</tr>
--- 29,34 ----
<tr>
<td>
! <a href="http://s
onofid.blogspot.com"><img
src="images/arrow_right.gif" alt=
! "Navigation item arrow"
/>Thomas's Blog</a>
</td>
</tr>
***************
*** 45,48 ****
--- 45,54 ----
</td>
</tr>
+ <tr>
+ <td>
+ <a href="http://ww
w.diracvideo.org/"><img
src="images/arrow_right.gif" alt=
+ "Navigation item arrow"
/>Schrodinger</a>
+ </td>
+ </tr>
<tr>
<td>
***************
*** 53,64 ****
<tr>
<td>
! <a
href="licences.html"><img
src="images/arrow_right.gif" alt=
! "Navigation item arrow"
/>licences</a>
</td>
- </tr>
<tr>
<td>
<a
href="getting_involved.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow" /> Getting
involved</a>
</td>
--- 59,69 ----
<tr>
<td>
! <a
href="licences.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow"
/>licences</a>
</td>
<tr>
<td>
<a
href="getting_involved.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow" />Getting
involved</a>
</td>
***************
*** 97,112 ****
<tr>
<td>
- <a
href="soc2006.html"><img
src="images/arrow_right.gif" alt=
- "Navigation item arrow"
/>Summer of Code 2006</a> <span class=
- "nav_sub"><br />
- <a
href="soc2006_ideas.html"><img src=
- "images/arrow_right_indent.gif"
alt="Navigation item
- arrow" />Project ideas</a>
- <br />
- </span>
- </td>
- </tr>
- <tr>
- <td>
<a href="http://source
forge.net"><img src=
"http://sourceforge.net/sflogo.php?group_id=
24405&type=1"
--- 102,105 ----
***************
*** 131,135 ****
</p>
<p>
! Dirac is an Open Source collaborative
project, and we welcome
contributions from anyone for any part
of the Dirac system.
We are keen to keep all discussion in
the public domain and
--- 124,129 ----
</p>
<p>
! Both Dirac and Schrodinger are Open
Source collaborative projects,
! and we welcome
contributions from anyone for any part
of the Dirac system.
We are keen to keep all discussion in
the public domain and
***************
*** 137,145 ****
please browse the <a href=
"http://sourceforge.net/forum/forum.php?forum_id=
353620">
! developers forum</a> for current
and future development. The
<a href=
"http://dirac.cvs.sourcefo
rge.net/dirac/compress/README.developers?view=markup"&g
t;
developers readme</a> outlines
code standards and information
! for code contributions.
</p>
<p>
--- 131,152 ----
please browse the <a href=
"http://sourceforge.net/forum/forum.php?forum_id=
353620">
! developers forum</a> for current
and future development in Dirac
! and subscribe to the Schrodinger mailing
list.
! </p>
! <p>
! Future development of a practical
real-world implementation will
! concentrate on <a href="http://dirac.cvs.sourcefo
rge.net/dirac/compress/README.developers?view=markup"&g
t;
developers readme</a> outlines
code standards and information
! for code contributions to the Dirac
codebase.
</p>
<p>
Index: overview.html
============================================================
=======
RCS file: /cvsroot/dirac/compress/doc/overview.html,v
retrieving revision 1.5
retrieving revision 1.6
diff -C2 -d -r1.5 -r1.6
*** overview.html 28 Sep 2006 17:13:19 -0000 1.5
--- overview.html 12 May 2008 05:29:42 -0000 1.6
***************
*** 36,39 ****
--- 36,45 ----
<tr>
<td>
+ <a href="http://s
onofid.blogspot.com"><img
src="images/arrow_right.gif"
+ alt="Navigation item arrow"
/>Thomas's Blog</a>
+ </td>
+ </tr>
+ <tr>
+ <td>
<a
href="faq.html"><img
src="images/arrow_right.gif" alt=
"Navigation item arrow"
/>FAQ</a>
***************
*** 47,50 ****
--- 53,62 ----
</td>
</tr>
+ <tr>
+ <td>
+ <a href="http://ww
w.diracvideo.org/"><img
src="images/arrow_right.gif" alt=
+ "Navigation item arrow"
/>Schrodinger</a>
+ </td>
+ </tr>
<tr>
<td>
***************
*** 56,63 ****
<tr>
<td>
! <a
href="licences.html"><img
src="images/arrow_right.gif"
! alt="Navigation item arrow"
/>licences</a>
</td>
- </tr>
<tr>
<td>
--- 68,75 ----
<tr>
<td>
! <a
href="licences.html"><img src=
! "images/arrow_right.gif"
alt=
! "Navigation item arrow"
/>licences</a>
</td>
<tr>
<td>
***************
*** 97,116 ****
<tr>
<td>
- <a
href="soc2006.html"><img
src="images/arrow_right.gif"
- alt="Navigation item arrow"
/>Summer of Code 2006</a> <span
- class="nav_sub"><br
/>
- <a
href="soc2006_ideas.html"><img src=
-
"images/arrow_right_indent.gif" alt=
- "Navigation item arrow"
/>Project ideas</a><br />
- </span>
- </td>
- </tr>
- <tr>
- <td>
- <br />
- </td>
- </tr>
- <tr>
- <td>
<a href="http://source
forge.net"><img src=
"http://sourceforge.net/sflogo.php?group_id=
24405&type=1"
--- 109,112 ----
***************
*** 139,149 ****
coding algorithm, based on wavelet
technology, which is
different from that used in the main
proprietary or
! standard video compression systems.
Our algorithm seems
! to give a two-fold reduction in bit
rate over MPEG-2 for
high definition video (e.g.
1920x1080 pixels), its
original target application. It has
been further
developed to optimise it for
internet streaming
resolutions and seems broadly
competitive with state of
! the art video codecs.
</p>
<p>
--- 135,145 ----
coding algorithm, based on wavelet
technology, which is
different from that used in the main
proprietary or
! standard video compression systems.
Our algorithm
! gives at least two-fold reduction in
bit rate over MPEG-2 for
high definition video (e.g.
1920x1080 pixels), its
original target application. It has
been further
developed to optimise it for
internet streaming
resolutions and seems broadly
competitive with state of
! the art video codecs such as H264.
</p>
<p>
***************
*** 154,170 ****
SourceForge. Quality portable
software to implement Dirac
is being delivered both on the Dirac
and Schrödinger
! ares of SourceForge. In hardware, we
are starting to see
! the first specialist products being
designed.
! </p>
! <p>
! The philosophy behind the Dirac
codec is 'keep it
! simple'. This is an ambitious aim
since video codecs,
! particularly those with state of the
art performance,
! tend to be fearsomely complex.
However, the BBC would
! like to collaborate with the Open
Source community,
! academics and others to produce an
open codec. It is
! therefore important for us to keep
the principles and
! design as simple as possible and to
provide copious
! documentation.
</p>
<p>
--- 150,158 ----
SourceForge. Quality portable
software to implement Dirac
is being delivered both on the Dirac
and Schrödinger
! ares of SourceForge. The
intra-coding part has been
! proposed by the BBC to the SMPTE as
an international
! standard, VC-2. In hardware, we are
starting to see
! the first VC-2 products being
designed, aimed at the
! professional market.
</p>
<p>
Index: contact.html
============================================================
=======
RCS file: /cvsroot/dirac/compress/doc/contact.html,v
retrieving revision 1.5
retrieving revision 1.6
diff -C2 -d -r1.5 -r1.6
*** contact.html 28 Sep 2006 17:13:19 -0000 1.5
--- contact.html 12 May 2008 05:29:42 -0000 1.6
***************
*** 31,36 ****
<tr>
<td>
! <a
href="overview.html"><img
src="images/arrow_right.gif"
! alt="Navigation item arrow"
/>Introduction</a>
</td>
</tr>
--- 31,36 ----
<tr>
<td>
! <a href="http://s
onofid.blogspot.com"><img
src="images/arrow_right.gif"
! alt="Navigation item arrow"
/>Thomas's Blog</a>
</td>
</tr>
***************
*** 50,53 ****
--- 50,59 ----
<tr>
<td>
+ <a href="http://ww
w.diracvideo.org/"><img
src="images/arrow_right.gif"
+ alt="Navigation item arrow"
/>Schrodinger</a>
+ </td>
+ </tr>
+ <tr>
+ <td>
<a
href="documentation.html"><img src=
"images/arrow_right.gif"
alt=
***************
*** 57,62 ****
<tr>
<td>
! <a
href="licences.html"><img
src="images/arrow_right.gif"
! alt="Navigation item arrow"
/>licences</a>
</td>
</tr>
--- 63,68 ----
<tr>
<td>
! <a
href="licences.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow"
/>licences</a>
</td>
</tr>
***************
*** 64,69 ****
<td>
<a
href="getting_involved.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow" />
! Getting involved</a>
</td>
</tr>
--- 70,74 ----
<td>
<a
href="getting_involved.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow" />Getting
involved</a>
</td>
</tr>
***************
*** 98,112 ****
<tr>
<td>
- <a
href="soc2006.html"><img
src="images/arrow_right.gif"
- alt="Navigation item arrow"
/>Summer of Code 2006</a> <span
- class="nav_sub"><br
/>
- <a
href="soc2006_ideas.html"><img src=
-
"images/arrow_right_indent.gif" alt=
- "Navigation item arrow"
/>Project ideas</a><br />
- </span>
- </td>
- </tr>
- <tr>
- <td>
<a href="http://source
forge.net"><img src=
"http://sourceforge.net/sflogo.php?group_id=
24405&type=1"
--- 103,106 ----
Index: documentation.html
============================================================
=======
RCS file: /cvsroot/dirac/compress/doc/documentation.html,v
retrieving revision 1.8
retrieving revision 1.9
diff -C2 -d -r1.8 -r1.9
*** documentation.html 2 Oct 2007 10:48:56 -0000 1.8
--- documentation.html 12 May 2008 05:29:42 -0000 1.9
***************
*** 29,34 ****
<tr>
<td>
! <a
href="overview.html"><img
src="images/arrow_right.gif" alt=
! "Navigation item arrow"
/>Introduction</a>
</td>
</tr>
--- 29,34 ----
<tr>
<td>
! <a href="http://s
onofid.blogspot.com"><img
src="images/arrow_right.gif" alt=
! "Navigation item arrow"
/>Thomas's Blog</a>
</td>
</tr>
***************
*** 45,48 ****
--- 45,54 ----
</td>
</tr>
+ <tr>
+ <td>
+ <a href="http://ww
w.diracvideo.org/"><img
src="images/arrow_right.gif" alt=
+ "Navigation item arrow"
/>Schrodinger</a>
+ </td>
+ </tr>
<tr>
<td>
***************
*** 71,82 ****
<tr>
<td>
! <a
href="licences.html"><img
src="images/arrow_right.gif" alt=
! "Navigation item arrow"
/>licences</a>
</td>
- </tr>
<tr>
<td>
<a
href="getting_involved.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow" /> Getting
involved</a>
</td>
--- 77,87 ----
<tr>
<td>
! <a
href="licences.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow"
/>licences</a>
</td>
<tr>
<td>
<a
href="getting_involved.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow" />Getting
involved</a>
</td>
***************
*** 115,130 ****
<tr>
<td>
- <a
href="soc2006.html"><img
src="images/arrow_right.gif" alt=
- "Navigation item arrow"
/>Summer of Code 2006</a> <span class=
- "nav_sub"><br />
- <a
href="soc2006_ideas.html"><img src=
- "images/arrow_right_indent.gif"
alt="Navigation item
- arrow" />Project ideas</a>
- <br />
- </span>
- </td>
- </tr>
- <tr>
- <td>
<a href="http://source
forge.net"><img src=
"http://sourceforge.net/sflogo.php?group_id=
24405&type=1"
--- 120,123 ----
***************
*** 234,239 ****
</p>
<p class="doc_blurb">
! Details the original compression
algorithms employed in the
! Dirac video codec
</p>
<p>
--- 227,232 ----
</p>
<p class="doc_blurb">
! Summarises the original compression
algorithms employed in the
! Dirac video codec:
</p>
<p>
***************
*** 243,290 ****
src="images/icon_zip.gif"
alt="ZIP" />zip</a>
</p>
! <p class="subhead">
! Up-conversion and down-conversion of
pictures
! </p>
! <p class="doc_blurb">
! Fast up-conversion and down-conversion
used in motion
! estimation and compensation.
! </p>
! <p class="doc_file">
! <a
href="documentation/algorithm/upconversion/index.htm&qu
ot;><img
! src="images/icon_html.gif"
alt="HTML" />html</a> | <a href=
!
"documentation/algorithm/upconversion/upconversion.pdf&
quot;><img
! src="images/icon_pdf.gif"
alt="PDF" />pdf</a> (520 KB) | <a
! href=
!
"documentation/algorithm/upconversion/upconversion.tar.
gz">
! <img
src="images/icon_zip.gif" alt="ZIP"
/> zip</a>
! </p>
! <p class="subhead">
! Global motion estimation
! </p>
! <p class="doc_blurb">
! Approximation of global motion between
frames
! </p>
! <p class="doc_file">
! <a
href="documentation/algorithm/global_motion/index.htm&q
uot;>
! <img
src="images/icon_html.gif" alt="HTML"
/>html</a> | <a
! href=
!
"documentation/algorithm/global_motion/global_motion.pd
f">
! <img
src="images/icon_pdf.gif" alt="PDF"
/>pdf</a> | <a href=
!
"documentation/algorithm/global_motion/global_motion.ta
r.gz">
! <img
src="images/icon_zip.gif" alt="ZIP"
/> zip</a>
! </p>
! <p class="subhead">
! Proposed enhancements
! </p>
! <p class="doc_blurb">
! Details of proposed future
developments.
</p>
! <p class="doc_file">
! <a
href="documentation/algorithm/enhancements/index.htm&qu
ot;><img
! src="images/icon_html.gif"
alt="HTML" />html</a> | <a href=
!
"documentation/algorithm/enhancements/enhancements.pdf&
quot;><img
! src="images/icon_pdf.gif"
alt="PDF" />pdf</a> (62 KB) | <a
!
href="documentation/algorithm/enhancements/enhancements
.zip">
! <img
src="images/icon_zip.gif" alt="ZIP"
/> zip</a>
</p>
<p class="arrow">
--- 236,246 ----
src="images/icon_zip.gif"
alt="ZIP" />zip</a>
</p>
! <p class="doc_blurb">
! A more detailed description, in relation
to the software classes
! (incomplete -- the constant bit rate
algorithm is missing):
</p>
! <p>
! <a
href="documentation/algorithm/algorithm/dirac_software_
alg0.2.pdf"><img
! <img
src="images/icon_pdf.gif" alt="PDF"
/>dirac_software_alg0.2.pdf</a>
</p>
<p class="arrow">
Index: faq.html
============================================================
=======
RCS file: /cvsroot/dirac/compress/doc/faq.html,v
retrieving revision 1.7
retrieving revision 1.8
diff -C2 -d -r1.7 -r1.8
*** faq.html 4 Dec 2006 12:00:28 -0000 1.7
--- faq.html 12 May 2008 05:29:42 -0000 1.8
***************
*** 30,35 ****
<tr>
<td>
! <a
href="overview.html"><img
src="images/arrow_right.gif" alt=
! "Navigation item arrow"
/>Introduction</a>
</td>
</tr>
--- 30,35 ----
<tr>
<td>
! <a href="http://s
onofid.blogspot.com"><img
src="images/arrow_right.gif" alt=
! "Navigation item arrow"
/>Thomas's Blog</a>
</td>
</tr>
***************
*** 46,49 ****
--- 46,55 ----
</td>
</tr>
+ <tr>
+ <td>
+ <a href="http://ww
w.diracvideo.org/"><img
src="images/arrow_right.gif" alt=
+ "Navigation item arrow"
/>Schrodinger</a>
+ </td>
+ </tr>
<tr>
<td>
***************
*** 54,65 ****
<tr>
<td>
! <a
href="licences.html"><img
src="images/arrow_right.gif" alt=
! "Navigation item arrow"
/>licences</a>
</td>
- </tr>
<tr>
<td>
<a
href="getting_involved.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow" /> Getting
involved</a>
</td>
--- 60,70 ----
<tr>
<td>
! <a
href="licences.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow"
/>licences</a>
</td>
<tr>
<td>
<a
href="getting_involved.html"><img src=
! "images/arrow_right.gif"
alt="Navigation item arrow" />Getting
involved</a>
</td>
***************
*** 98,113 ****
<tr>
<td>
- <a
href="soc2006.html"><img
src="images/arrow_right.gif" alt=
- "Navigation item arrow"
/>Summer of Code 2006</a> <span class=
- "nav_sub"><br />
- <a
href="soc2006_ideas.html"><img src=
- "images/arrow_right_indent.gif"
alt="Navigation item
- arrow" />Project ideas</a>
- <br />
- </span>
- </td>
- </tr>
- <tr>
- <td>
<a href="http://source
forge.net"><img src=
"http://sourceforge.net/sflogo.php?group_id=
24405&type=1"
--- 103,106 ----
***************
*** 170,176 ****
</p>
<p>
- <a href="#a11">What
about Ogg Theora?</a>
- </p>
- <p>
<a href="#a12">How does
it work?</a>
</p>
--- 163,166 ----
***************
*** 180,186 ****
</p>
<p>
- <a href="#a14">What's
with your picture file format?</a>
- </p>
- <p>
<a href="#a15">How do I
play compressed video?</a>
</p>
--- 170,173 ----
***************
*** 192,198 ****
</p>
<p>
- <a href="#a18">What
needs doing?</a>
- </p>
- <p>
<a href="#a19">When will
Dirac be ready?</a>
</p>
--- 179,182 ----
***************
*** 217,223 ****
<p>
Within the BBC, the project leader is
Tim Borer, and Thomas
! Davies is the guru who understands the
algorithm in more
! depth than most. The software is managed
by Anu Suraparaju.
! Today, Peter Bleackley and David Flynn
are looking at some of
the hardware aspects of the system. In
the recent past,
Andrew Kennedy, Michael Prior-Jones,
Chris Bowley and others
--- 201,207 ----
<p>
Within the BBC, the project leader is
Tim Borer, and Thomas
! Davies developed the original algorithm
and has written the bulk of
! the specification for Dirac and VC-2.
The software is managed by Anu Suraparaju.
! Today, Jonathan Rosser and David Flynn
are looking at some of
the hardware aspects of the system. In
the recent past,
Andrew Kennedy, Michael Prior-Jones,
Chris Bowley and others
***************
*** 332,342 ****
</p>
<p>
! Yes. We have patent applications in
train for some of the
! techniques involved in Dirac, and others
that we intend to
! put into Dirac in the future. There has
been some FUD about
! this, so we'll be clear: this does not
affect the Open Source
! status of Dirac, nor does it affect its
royalty-free status.
! The conditions of the MPL mean that
we're licensing these
! patents for use within the Dirac
software for free.
</p>
<p class="arrow">
--- 316,326 ----
</p>
<p>
! No. We did have patent applications in
train which included
! some of the techniques involved in
Dirac, but we let those
! parts that related to Dirac lapse. If we
had allowed them to
! continue, users of the Dirac code would
still have been
! covered in perpetuity by the licence: by
letting them lapse,
! the BBC has no IPR interest in any
implementation of Dirac by
! anyone, based on the Dirac software or
not.
</p>
<p class="arrow">
***************
*** 355,367 ****
tens of thousands of video compression
techniques. That's not
the way to invent a successful
algorithm. Instead we've tried
! to use techniques of long standing in
novel ways. Where we
! think we're novel, we're in the process
of getting patent
! protection ourselves, which will
invalidate others' claims of
! priority.
</p>
<p>
There are some areas that are more
heavily patented than
others. Arithmetic coding is one such,
even though the
! technique itself has been around for 25
years. We're keeping
an eye on the situation, and we'll adopt
alternative
techniques if we have to. Some of the
recent changes in the
--- 339,348 ----
tens of thousands of video compression
techniques. That's not
the way to invent a successful
algorithm. Instead we've tried
! to use techniques of long standing in
novel ways.
</p>
<p>
There are some areas that are more
heavily patented than
others. Arithmetic coding is one such,
even though the
! technique itself has been around for 30
years. We're keeping
an eye on the situation, and we'll adopt
alternative
techniques if we have to. Some of the
recent changes in the
***************
*** 408,415 ****
</p>
<p>
! What we need to deliver next is hardware
which can be used
live for encoding - without that, there
is a problem
delivering streaming video at the
volumes that the BBC would
! expect.
</p>
<p class="arrow">
--- 389,397 ----
</p>
<p>
! What we need to deliver next is hardware
or software which can be used
live for encoding - without that, there
is a problem
delivering streaming video at the
volumes that the BBC would
! expect. The <a href="http://www.diracvideo.org/">Schrodinger</a&g
t;
! project will help us achieve that.
</p>
<p class="arrow">
***************
*** 429,462 ****
millions of customers is too large.
</p>
- <p>
- However, <a href="http://www.
dvb.org">DVB</a> is starting to
- look at a new modulation system for
terrestrial broadcasting.
- Perhaps there could be an opportunity
here. For DVB to adopt
- Dirac, they would have to be able to
reference Dirac as a
- standard. That begs another question.
- </p>
<p class="arrow">
<a href="#top"><img
src="images/arrow_up.gif" alt="Up
arrow" />top</a>
</p>
- <p
class="responseheader">
- <a id="a11" /> What
about Ogg Theora?
- </p>
- <p>
- Theora is coming on very nicely, and has
an impressive,
- well-defined spec. We think we have much
better compression
- performance, but you can't have too many
free codecs. The
- Open Source community needs to continue
to develop codecs
- with increasingly better performance.
Theora has helped
- create a pool of Open Source compression
experts, which is of
- benefit to everyone in the field.
- </p>
- <p>
- We intend to pack the Dirac elementary
stream into MXF, which
- has lots of useful features. That
doesn't preclude it packing
- into Ogg (or Matroska, or anything else)
as well, and it's
- probably a good idea to have a variety
of packing formats.
- For this the elementary stream needs to
be very well defined.
- </p>
<p class="arrow">
<a href="#top"> <img
src="images/arrow_up.gif" alt="Up
--- 411,418 ----
***************
*** 507,523 ****
arrow" />top</a>
</p>
- <p
class="responseheader">
- <a id="a14" /> What's
with your picture file format?
- </p>
- <p>
- Dirac now just uses raw planar YUV, and
there's no need to
- create a header anymore. We also have
patches for ffmpeg and
- transcode, so you can use any of the
formats they
- support. We've also got some tools for
converting formats to
- and from the raw format, and there's
advice on using these in
- the users <a href=
- "http://dirac.cvs.sourceforge.net/dir
ac/compress/README?view=markup">
- README</a> in the distribution.
- </p>
<p class="arrow">
<a href="#top"><img
src="images/arrow_up.gif" alt="Up
--- 463,466 ----
***************
*** 555,559 ****
</p>
<p>
! By telling people about Dirac. By
contributing to the code.
See <a
href="getting_involved.html">getting
involved</a> or
<a
href="contact.html">contact us</a> to
find out more.
--- 498,503 ----
</p>
<p>
! By telling people about Dirac and the
Schrodinger
! real-time implementation. By
contributing to the codebases.
See <a
href="getting_involved.html">getting
involved</a> or
<a
href="contact.html">contact us</a> to
find out more.
***************
*** 564,585 ****
</p>
<p
class="responseheader">
- <a id="a18" /> What
needs doing?
- </p>
- <p>
- There's still a lot to do. We need
optimisation work for the
- encoder and decoder - the encoder in
particular will always
- benefit from speeding up. We also need
to integrate tools
- like global motion, and optimise other
tools. Another thing
- we lack is a buffer model and constant
bit-rate encoding.
- </p>
- <p>
- For a full(er) list, see the <a
href="todo.html">TODO
- list</a>.
- </p>
- <p class="arrow">
- <a href="#top"><img
src="images/arrow_up.gif" alt="Up
- arrow" />top</a>
- </p>
- <p
class="responseheader">
<a id="a19" /> When will
Dirac be ready?
</p>
--- 508,511 ----
***************
*** 588,596 ****
</p>
<p>
! We already have a specification that can
be used for real. We
! can code in non-real time in software,
and for many
! application real-time decoding is now
feasible. What we have
! not yet delivered is real hardware
coders for main-stream
! use. That is the next phase of the
project.
</p>
<p class="arrow">
--- 514,520 ----
</p>
<p>
! Very soon. The Schrodinger real-time
implmentation is rapidly
! approaching version 1.0 and hardware
products based on the VC-2
! professional subset are being
finalised.
</p>
<p class="arrow">
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mits
|
![http://dirac.cvs.sourcefo rge.net/dirac/compress/README.developers?view=markup"&g t;](http://www.diracvideo.org/">Schrodinger</a&
gt;<img
src='http://www.archivesat.com/images/blushing.gif'>http://w
ww.diracvideo.org/">Schrodinger</a>:</a>
! if this is your bag, then your
! efforts are best directed there. The
Dirac codebase will continue
! as a set of reference implementations
and (for a little while longer)
! as an experimental platform
! for compression improvements.
! </p>
! <p>
! The
<a href=
"<a
href=){kind=link}