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<h1 class="titlefont">NUT</h1>
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<a name="SEC_Contents"></a>
<h1>Table of Contents</h1>

<div class="contents">

<ul class="no-bullet">
  <li><a name="toc-Description" href="#Description">1 Description</a></li>
  <li><a name="toc-Modes" href="#Modes">2 Modes</a>
  <ul class="no-bullet">
    <li><a name="toc-BROADCAST" href="#BROADCAST">2.1 BROADCAST</a></li>
    <li><a name="toc-PIPE" href="#PIPE">2.2 PIPE</a></li>
  </ul></li>
  <li><a name="toc-Container_002dspecific-codec-tags" href="#Container_002dspecific-codec-tags">3 Container-specific codec tags</a>
  <ul class="no-bullet">
    <li><a name="toc-Generic-raw-YUVA-formats" href="#Generic-raw-YUVA-formats">3.1 Generic raw YUVA formats</a></li>
    <li><a name="toc-Raw-Audio" href="#Raw-Audio">3.2 Raw Audio</a></li>
    <li><a name="toc-Subtitles" href="#Subtitles">3.3 Subtitles</a></li>
    <li><a name="toc-Raw-Data" href="#Raw-Data">3.4 Raw Data</a></li>
    <li><a name="toc-Codecs" href="#Codecs">3.5 Codecs</a></li>
  </ul>
</li>
</ul>
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<hr size="6">
<a name="Description"></a>
<h1 class="chapter"><a href="nut.html#toc-Description">1 Description</a></h1>
<p>NUT is a low overhead generic container format. It stores audio, video,
subtitle and user-defined streams in a simple, yet efficient, way.
</p>
<p>It was created by a group of FFmpeg and MPlayer developers in 2003
and was finalized in 2008.
</p>
<p>The official nut specification is at svn://svn.mplayerhq.hu/nut
In case of any differences between this text and the official specification,
the official specification shall prevail.
</p>
<a name="Modes"></a>
<h1 class="chapter"><a href="nut.html#toc-Modes">2 Modes</a></h1>
<p>NUT has some variants signaled by using the flags field in its main header.
</p>
<table>
<tr><td width="40%">BROADCAST</td><td width="40%">Extend the syncpoint to report the sender wallclock</td></tr>
<tr><td width="40%">PIPE</td><td width="40%">Omit completely the syncpoint</td></tr>
</table>

<a name="BROADCAST"></a>
<h2 class="section"><a href="nut.html#toc-BROADCAST">2.1 BROADCAST</a></h2>

<p>The BROADCAST variant provides a secondary time reference to facilitate
detecting endpoint latency and network delays.
It assumes all the endpoint clocks are synchronized.
To be used in real-time scenarios.
</p>
<a name="PIPE"></a>
<h2 class="section"><a href="nut.html#toc-PIPE">2.2 PIPE</a></h2>

<p>The PIPE variant assumes NUT is used as non-seekable intermediate container,
by not using syncpoint removes unneeded overhead and reduces the overall
memory usage.
</p>
<a name="Container_002dspecific-codec-tags"></a>
<h1 class="chapter"><a href="nut.html#toc-Container_002dspecific-codec-tags">3 Container-specific codec tags</a></h1>

<a name="Generic-raw-YUVA-formats"></a>
<h2 class="section"><a href="nut.html#toc-Generic-raw-YUVA-formats">3.1 Generic raw YUVA formats</a></h2>

<p>Since many exotic planar YUVA pixel formats are not considered by
the AVI/QuickTime FourCC lists, the following scheme is adopted for
representing them.
</p>
<p>The first two bytes can contain the values:
Y1 = only Y
Y2 = Y+A
Y3 = YUV
Y4 = YUVA
</p>
<p>The third byte represents the width and height chroma subsampling
values for the UV planes, that is the amount to shift the luma
width/height right to find the chroma width/height.
</p>
<p>The fourth byte is the number of bits used (8, 16, ...).
</p>
<p>If the order of bytes is inverted, that means that each component has
to be read big-endian.
</p>
<a name="Raw-Audio"></a>
<h2 class="section"><a href="nut.html#toc-Raw-Audio">3.2 Raw Audio</a></h2>

<table>
<tr><td width="40%">ALAW</td><td width="40%">A-LAW</td></tr>
<tr><td width="40%">ULAW</td><td width="40%">MU-LAW</td></tr>
<tr><td width="40%">P&lt;type&gt;&lt;interleaving&gt;&lt;bits&gt;</td><td width="40%">little-endian PCM</td></tr>
<tr><td width="40%">&lt;bits&gt;&lt;interleaving&gt;&lt;type&gt;P</td><td width="40%">big-endian PCM</td></tr>
</table>

<p>&lt;type&gt; is S for signed integer, U for unsigned integer, F for IEEE float
&lt;interleaving&gt; is D for default, P is for planar.
&lt;bits&gt; is 8/16/24/32
</p>
<div class="example">
<pre class="example">PFD[32]   would for example be signed 32 bit little-endian IEEE float
</pre></div>

<a name="Subtitles"></a>
<h2 class="section"><a href="nut.html#toc-Subtitles">3.3 Subtitles</a></h2>

<table>
<tr><td width="40%">UTF8</td><td width="40%">Raw UTF-8</td></tr>
<tr><td width="40%">SSA[0]</td><td width="40%">SubStation Alpha</td></tr>
<tr><td width="40%">DVDS</td><td width="40%">DVD subtitles</td></tr>
<tr><td width="40%">DVBS</td><td width="40%">DVB subtitles</td></tr>
</table>

<a name="Raw-Data"></a>
<h2 class="section"><a href="nut.html#toc-Raw-Data">3.4 Raw Data</a></h2>

<table>
<tr><td width="40%">UTF8</td><td width="40%">Raw UTF-8</td></tr>
</table>

<a name="Codecs"></a>
<h2 class="section"><a href="nut.html#toc-Codecs">3.5 Codecs</a></h2>

<table>
<tr><td width="40%">3IV1</td><td width="40%">non-compliant MPEG-4 generated by old 3ivx</td></tr>
<tr><td width="40%">ASV1</td><td width="40%">Asus Video</td></tr>
<tr><td width="40%">ASV2</td><td width="40%">Asus Video 2</td></tr>
<tr><td width="40%">CVID</td><td width="40%">Cinepak</td></tr>
<tr><td width="40%">CYUV</td><td width="40%">Creative YUV</td></tr>
<tr><td width="40%">DIVX</td><td width="40%">non-compliant MPEG-4 generated by old DivX</td></tr>
<tr><td width="40%">DUCK</td><td width="40%">Truemotion 1</td></tr>
<tr><td width="40%">FFV1</td><td width="40%">FFmpeg video 1</td></tr>
<tr><td width="40%">FFVH</td><td width="40%">FFmpeg Huffyuv</td></tr>
<tr><td width="40%">H261</td><td width="40%">ITU H.261</td></tr>
<tr><td width="40%">H262</td><td width="40%">ITU H.262</td></tr>
<tr><td width="40%">H263</td><td width="40%">ITU H.263</td></tr>
<tr><td width="40%">H264</td><td width="40%">ITU H.264</td></tr>
<tr><td width="40%">HFYU</td><td width="40%">Huffyuv</td></tr>
<tr><td width="40%">I263</td><td width="40%">Intel H.263</td></tr>
<tr><td width="40%">IV31</td><td width="40%">Indeo 3.1</td></tr>
<tr><td width="40%">IV32</td><td width="40%">Indeo 3.2</td></tr>
<tr><td width="40%">IV50</td><td width="40%">Indeo 5.0</td></tr>
<tr><td width="40%">LJPG</td><td width="40%">ITU JPEG (lossless)</td></tr>
<tr><td width="40%">MJLS</td><td width="40%">ITU JPEG-LS</td></tr>
<tr><td width="40%">MJPG</td><td width="40%">ITU JPEG</td></tr>
<tr><td width="40%">MPG4</td><td width="40%">MS MPEG-4v1 (not ISO MPEG-4)</td></tr>
<tr><td width="40%">MP42</td><td width="40%">MS MPEG-4v2</td></tr>
<tr><td width="40%">MP43</td><td width="40%">MS MPEG-4v3</td></tr>
<tr><td width="40%">MP4V</td><td width="40%">ISO MPEG-4 Part 2 Video (from old encoders)</td></tr>
<tr><td width="40%">mpg1</td><td width="40%">ISO MPEG-1 Video</td></tr>
<tr><td width="40%">mpg2</td><td width="40%">ISO MPEG-2 Video</td></tr>
<tr><td width="40%">MRLE</td><td width="40%">MS RLE</td></tr>
<tr><td width="40%">MSVC</td><td width="40%">MS Video 1</td></tr>
<tr><td width="40%">RT21</td><td width="40%">Indeo 2.1</td></tr>
<tr><td width="40%">RV10</td><td width="40%">RealVideo 1.0</td></tr>
<tr><td width="40%">RV20</td><td width="40%">RealVideo 2.0</td></tr>
<tr><td width="40%">RV30</td><td width="40%">RealVideo 3.0</td></tr>
<tr><td width="40%">RV40</td><td width="40%">RealVideo 4.0</td></tr>
<tr><td width="40%">SNOW</td><td width="40%">FFmpeg Snow</td></tr>
<tr><td width="40%">SVQ1</td><td width="40%">Sorenson Video 1</td></tr>
<tr><td width="40%">SVQ3</td><td width="40%">Sorenson Video 3</td></tr>
<tr><td width="40%">theo</td><td width="40%">Xiph Theora</td></tr>
<tr><td width="40%">TM20</td><td width="40%">Truemotion 2.0</td></tr>
<tr><td width="40%">UMP4</td><td width="40%">non-compliant MPEG-4 generated by UB Video MPEG-4</td></tr>
<tr><td width="40%">VCR1</td><td width="40%">ATI VCR1</td></tr>
<tr><td width="40%">VP30</td><td width="40%">VP 3.0</td></tr>
<tr><td width="40%">VP31</td><td width="40%">VP 3.1</td></tr>
<tr><td width="40%">VP50</td><td width="40%">VP 5.0</td></tr>
<tr><td width="40%">VP60</td><td width="40%">VP 6.0</td></tr>
<tr><td width="40%">VP61</td><td width="40%">VP 6.1</td></tr>
<tr><td width="40%">VP62</td><td width="40%">VP 6.2</td></tr>
<tr><td width="40%">VP70</td><td width="40%">VP 7.0</td></tr>
<tr><td width="40%">WMV1</td><td width="40%">MS WMV7</td></tr>
<tr><td width="40%">WMV2</td><td width="40%">MS WMV8</td></tr>
<tr><td width="40%">WMV3</td><td width="40%">MS WMV9</td></tr>
<tr><td width="40%">WV1F</td><td width="40%">non-compliant MPEG-4 generated by ?</td></tr>
<tr><td width="40%">WVC1</td><td width="40%">VC-1</td></tr>
<tr><td width="40%">XVID</td><td width="40%">non-compliant MPEG-4 generated by old Xvid</td></tr>
<tr><td width="40%">XVIX</td><td width="40%">non-compliant MPEG-4 generated by old Xvid with interlacing bug</td></tr>
</table>

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