[xiph-commits] r6961 - websites/theora.org
nilesh at dactyl.lonelymoon.com
nilesh
Sat Jul 3 04:12:44 PDT 2004
Author: nilesh
Date: Sat Jul 3 04:12:44 2004
New Revision: 6961
Added:
websites/theora.org/theorafaq2.html
Modified:
websites/theora.org/style.css
Log:
Reorganizing theora FAQ. Created theorafaq2.html, which is mostly same as old
theorafaq.html, but is in more organized form.
In style.css, added a class named .headline, which is used in new FAQ, to
write heading.
Modified: websites/theora.org/style.css
===================================================================
--- websites/theora.org/style.css 2004-07-03 04:37:12 UTC (rev 6960)
+++ websites/theora.org/style.css 2004-07-03 11:12:43 UTC (rev 6961)
@@ -21,3 +21,6 @@
.xiphtag {
text-align: center;
}
+.headline {
+ font-size: x-large; font-weight: bold;
+}
Added: websites/theora.org/theorafaq2.html
===================================================================
--- websites/theora.org/theorafaq2.html 2004-07-03 04:37:12 UTC (rev 6960)
+++ websites/theora.org/theorafaq2.html 2004-07-03 11:12:43 UTC (rev 6961)
@@ -0,0 +1,401 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 TRANSITIONAL//EN"
+ "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+<title>theora.org :: FAQ</title>
+<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+<style type="text/css">
+ @import url(style.css);
+</style>
+</head>
+<body bgcolor="#666699" text="#000000" alink="#000000">
+<table width="500" border="0" cellspacing="0" cellpadding="2" align="center">
+ <tr>
+ <td bgcolor="#000000">
+ <table width="100%" border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <td bgcolor="#EEEEEE" align="left">
+ <table width="100%" border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <td valign="top" align="left">
+ <table border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <td width="50" height="50" bgcolor="#444466" class="tl">
+ </td>
+ <td align="right" valign="top">
+ <table border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <td bgcolor="#9898BA" width="25" height="25" class="tl"> </td>
+ </tr>
+ </table>
+ </td>
+ </tr>
+ <tr>
+ <td valign="bottom">
+ <table border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <td bgcolor="#9898BA" width="25" height="25" class="tl"> </td>
+ </tr>
+ </table>
+ </td>
+ <td valign="bottom"> </td>
+ </tr>
+ </table>
+ </td>
+ <td valign="top" align="right">
+ <table border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <td class="nutrition" align="right">
+ <!-- Title (HINT: Shorter is better.)
+-->theora.org<!-- Close Title -->
+ </td>
+ </tr>
+ <tr>
+ <td align="right">
+ <table border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <!-- Menu (HINT: Each item is inside a <td>.)-->
+ <td class="menu"> <a
+href="http://www.theora.org">Home</a></td>
+ <td class="menu"><a
+href="http://www.theora.org/theorafaq.html">FAQ</a></td>
+ <td class="menu"><a
+href="http://www.theora.org/lists.html">Mailing Lists</a></td>
+ <td class="menu"><a
+href="http://www.theora.org/svn.html">SVN</a></td>
+ <td class="menu"><a
+href="http://www.theora.org/contact.html">Contact</a></td>
+ <td class="menu"><a
+href="http://www.xiph.org">Xiph.org</a></td>
+ <!-- Close Menu -->
+ </tr>
+ </table>
+ </td>
+ </tr>
+ </table>
+ </td>
+ </tr>
+ </table>
+ </td>
+ </tr>
+ <tr>
+ <td bgcolor="#EEEEEE">
+ <table width="100%" border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <td valign="top">
+ <table width="100%" border="0" cellspacing="0" cellpadding="10">
+ <tr>
+ <td>
+ <!-- Main Content -->
+<h1 class="headline">Theora FAQ</h1>
+<a href="#what"><b>What is theora</b></a>
+<br>
+<ul>
+ <li><a href="#10">What is theora?</a></li>
+ <li><a href="#11">Why use theora?</a></li>
+ <li><a href="#12">What other video formats will Theora compete with?</a></li>
+ <li><a href="#13">What is Ogg? What is Vorbis? What is xiph.org?</a></li>
+ <li><a href="#14">What is the license for Theora?</a></li>
+ <li><a href="#15">Why the name 'Theora?'</a></li>
+</ul>
+<a href="#vp3"><b>Theora and VP3</b></a>
+<ul>
+ <li><a href="#20">Is the Theora bitstream identical to VP3? </a></li>
+ <li><a href="#21">What can Theora do that VP3 couldn't do? </a></li>
+ <li><a href="#22">How will I transition my old VP3 files to the new format?</a></li>
+ <li><a href="#23">Can I convert Ogg Theora files into VP3?</a></li>
+ <li><a href="#24">Isn't vp3 a patented technology? </a></li>
+ <li><a href="#25">What if Xiph.org and On2 decide to break off their agreement? </a></li>
+</ul>
+<br>
+<a href="#development"><b>Development</b></a>
+<ul>
+ <li><a href="#30">When will it all be finished? Can I use it right now?</a></li>
+ <li><a href="#31">What is an Alpha Release?</a></li>
+ <li><a href="#32">Is Theora Final?</a></li>
+ <li><a href="#33">Can I use Theora to encode stuff right now?</a></li>
+ <li><a href="#34">What is Tarkin? </a></li>
+ <li><a href="#35">How can I help with development?</a></li>
+ <li><a href="#36"> How will Ogg Theora interoperate with [insert your favorite media architecture]?</a></li>
+ <li><a href="#37">How can I donate to these amazing projects?</a></li>
+</ul>
+<br>
+<a href="#working"><b>Using Theora</b></a>
+<ul>
+ <li><a href="#40">What players currently support Theora?</a></li>
+ <li><a href="#41">How can I encode videos to theora?</a></li>
+ <li><a href="#42">Is there any way to use Theora on Microsoft Windows at this point?</a></li>
+</ul>
+<br>
+<a href="#misc"><b>Misc and Credits</b></a>
+<ul>
+ <li><a href="#50">Who's in charge of Theora development?</a></li>
+ <li><a href="#51">Who designed this website? </a></li>
+ <li><a href="#52">Who is the webmaster of this site?</a></li>
+ <li><a href="#53">Who maintains The Glorious Theora FAQ?</a></li>
+ <li><a href="#54">When was this FAQ last updated?</a></li>
+</ul>
+<br>
+<a name="what"></a><b>What is Theora</b>
+<br>
+<br>
+<a name="10"></a>
+<b>Q. What is theora?</b><br>
+Theora is a <i>open</i> video codec being developed by the Xiph.org
+Foundation as part of their Ogg project. Theora is derived directly
+from On2's VP3 codec; Currently the two are nearly identical, varying
+only in framing headers, but Theora will diverge and improve from
+the main VP3 development lineage as time progresses.
+<br>
+<br>
+<a name="11"></a>
+<b>Q. Why use theora?</b><br>
+Its open and free. Do you need more reasons?
+<br>
+<br>
+<a name="12"></a>
+<b>Q. What other video formats will Theora compete with?</b><br>
+ Theora is targeted at competing with MPEG-4 (e.g., XviD and DivX),
+RealVideo, Windows Media Video, and similar lower-bitrate video
+compression schemes.
+<br>
+<br>
+<a name="13"></a>
+<b>Q. What is Ogg? What is Vorbis? What is xiph.org?</b><br>
+ <a href="http://www.vorbis.com/">Vorbis</a> is an audio codec,
+Theora is a video codec. Ogg is the transport layer that both are stored in,
+so a video file will be Theora-encoded data inside an Ogg file, while audio
+is normally Vorbis-encoded data inside an ogg file.
+<br>
+ The <a href="http://www.xiph.org/">Xiph.org</a> Foundation is a
+Delaware non-profit company devoted to producing, maintaining and
+supporting an open multimedia platform.
+<br>
+<br>
+<a name="14"></a>
+<b>Q. What is the license for Theora?</b><br>
+Theora (and all associated technologies released by the Xiph.org
+Foundation) is released to the public via a BSD-style license. It is
+completely free for commercial or noncommercial use. That means that
+commercial developers may independently write Theora software which is
+compatible with the specification for no charge and without restrictions of
+any kind.
+<br>
+<br>
+<a name="15"></a>
+<b>Q. Why the name 'Theora?'</b><br>
+Like other Xiph.org Foundation codec projects such as Vorbis or Tarkin,
+Theora is named after a fictional character. Theora Jones was the name of
+Edison Carter's 'controller' on the television series Max Headroom. She was
+played by Amanda Pays.
+<br>
+<br>
+<a name="vp3"></a>
+<b>Theora and VP3 </b>
+<br>
+<br>
+<a name="20"></a>
+<b>Q. Is the Theora bitstream identical to VP3?</b><br>
+ Yes and No. Theora is a superset of VP3, so VP3 streams (with minor
+syntactic modifications) can be made into Theora streams without
+recompression (but not vice versa).
+<br>
+ Theora will be almost entirely based upon the VP3 codec designed by On2.
+However, Theora video data will be delivered inside of the Ogg container
+format (with Vorbis for audio), so Ogg Theora files will not be the same as
+VP3 files. There also may be quite a few performance advantages to using
+Theora when 1.0 is complete; While our focus is integration, there will
+certainly be a lot of optimization involved, as well.
+<br>
+<br>
+<a name="21"></a>
+<b>Q. What can Theora do that VP3 couldn't do?</b><br>
+ The major change from VP3 to Theora is architectural. VP3, like most
+codecs of today, makes certain assumptions about the nature of the material
+it compresses. These assumptions take the form of fixed sets of numeric
+values, such as quantization matrices, which control how different
+frequency components of the signal are handled, and token frequency tables,
+which control the efficiency of post-transform lossless coding. In Theora,
+we have leveraged the intrinsic flexibility of the Ogg multimedia framework
+to allow the encoder to modify these values appropriately for the material.
+This simple, powerful approach has already been proven effective in Vorbis,
+and will allow for a longer cycle of encoder optimization without requiring
+client-side updates.
+<br>
+<br>
+<a name="22"></a>
+<b>Q. How will I transition my old VP3 files to the new format?</b><br>
+ Because Theora is a 'superset' of VP3, tools can easily be created that
+will allow VP3 files to be losslessly transcoded into Ogg Theora format
+with no loss in quality.
+<br>
+<br>
+<a name="23"></a>
+<b>Q. Can I convert Ogg Theora files into VP3?</b><br>
+ Why would you want to do something stupid like that? Are you nuts?
+<br>
+<br>
+<a name="24"></a>
+<b>Q. Isn't vp3 a patented technology?</b><br>
+ Yes, some portions of the vp3 codec are covered by patents. However, the
+Xiph.org Foundation has negotiated an irrevocable free license to the vp3
+codec for any purpose imaginable on behalf of the public. It is legal to
+use vp3 in any way you see fit (unless, of course, you're doing something
+illegal with it in your particular jurisdiction). You are free to download
+vp3, use it free of charge, implement it in a for-sale product, implement
+it in a free product, make changes to the source and distribute those
+changes, or print the source code out and wallpaper your spare room with
+it.
+<br>
+For more information, check the VP3 Legal Terms on the SVN page
+<br>
+<br>
+<a name="25"></a>
+<b>Q. What if Xiph.org and On2 decide to break off their agreement?</b><br>
+ Because Theora is an Open Source project, the source code will continue to
+be available and development will continue. Users will still be protected
+from the On2 patents.
+<br>
+<br>
+<a name="development"></a>
+<b>Development </b>
+<br>
+<br>
+<a name="30"></a>
+<b>Q. When will it all be finished? Can I use it right now?</b><br>
+
+<br>
+<br>
+<a name="31"></a>
+<b>Q. What is an Alpha Release?</b><br>
+
+<br>
+<br>
+<a name="32"></a>
+<b>Q. Is Theora Final?</b><br>
+
+<br>
+<br>
+<a name="33"></a>
+<b>Q. Can I use Theora to encode stuff right now?</b><br>
+
+<br>
+<br>
+<a name="34"></a>
+<b>Q. What is Tarkin?</b><br>
+
+<br>
+<br>
+<a name="35"></a>
+<b>Q. How can I help with development?</b><br>
+
+<br>
+<br>
+<a name="36"></a>
+<b>Q. How will Ogg Theora interoperate with [insert your favorite media architecture]?</b><br>
+
+<br>
+<br>
+<a name="37"></a>
+<b>Q. How can I donate to these amazing projects?</b><br>
+
+<br>
+<br>
+<a name="working"></a>
+<b>Using Theora </b>
+<br>
+<br>
+<a name="40"></a>
+<b>Q. What players currently support Theora?</b><br>
+
+<br>
+<br>
+<a name="41"></a>
+<b>Q. How can I encode videos to theora?</b><br>
+
+<br>
+<br>
+<a name="42"></a>
+<b>Q. Is there any way to use Theora on Microsoft Windows at this point?</b><br>
+
+<br>
+<br>
+<a name="misc"></a>
+<b>Misc and Credits </b>
+<br>
+<br>
+<a name="50"></a>
+<b>Q. Who's in charge of Theora development?</b><br>
+
+<br>
+<br>
+<a name="51"></a>
+<b>Q. Who designed this website?</b><br>
+
+<br>
+<br>
+<a name="52"></a>
+<b>Q. Who is the webmaster of this site?</b><br>
+
+<br>
+<br>
+<a name="53"></a>
+<b>Q. Who maintains The Glorious Theora FAQ?</b><br>
+
+<br>
+<br>
+<a name="54"></a>
+<b>Q. When was this FAQ last updated?</b><br>
+
+<br>
+<br>
+ <!-- Close Content -->
+ </td>
+ </tr>
+ </table>
+ <table border="0" cellspacing="0" cellpadding="3">
+ <tr>
+ <td class="bl" bgcolor="#777777" nowrap>
+ <!-- Copyright (HINT: This is for decoration. You may change it to what you like.) -->
+ This is <a
+href="http://www.opencontent.org">OpenContent</a>. Go nuts.
+ <!-- Close Copyright -->
+ </td>
+ </tr>
+ </table>
+ </td>
+ <td width="79" align="right" valign="bottom">
+ <table border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <td> </td>
+ <td align="right">
+ <table border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <td bgcolor="#9898BA" width="25" height="25" class="brsmt"> </td>
+ </tr>
+ </table>
+ </td>
+ </tr>
+ <tr>
+ <td valign="bottom">
+ <table border="0" cellspacing="0" cellpadding="0">
+ <tr>
+ <td bgcolor="#9898BA" width="25" height="25" class="brsmt"> </td>
+ </tr>
+ </table>
+ </td>
+ <td width="50" height="50" bgcolor="#444466" class="brsmt">
+ </td>
+ </tr>
+ </table>
+ </td>
+ </tr>
+ </table>
+ </td>
+ </tr>
+ </table>
+ </td>
+ </tr>
+</table>
+</body>
+</html>
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