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  1. <!DOCTYPE html>

  2. <html lang="en">

  3.   <head>

  4.     <meta charset="utf-8" />

  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />

  6.     <title>FFmpeg documentation</title>

  7.     <link rel="stylesheet" href="bootstrap.min.css" />

  8.     <link rel="stylesheet" href="style.min.css" />

  9. 

  10. <meta name="description" content="NUT: ">

  11. <meta name="keywords" content="FFmpeg documentation : NUT: ">

  12. <meta name="Generator" content="texi2html 5.0">

  13. <!-- Created on March 9, 2020 by texi2html 5.0 -->

  14. <!--

  15. texi2html was written by: 

  16.             Lionel Cons <Lionel.Cons@cern.ch> (original author)

  17.             Karl Berry  <karl@freefriends.org>

  18.             Olaf Bachmann <obachman@mathematik.uni-kl.de>

  19.             and many others.

  20. Maintained by: Many creative people.

  21. Send bugs and suggestions to <texi2html-bug@nongnu.org>

  22. 

  23. -->

  24. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  25.   </head>

  26.   <body>

  27.     <div class="container">

  28. 

  29. <h1 class="titlefont">NUT</h1>

  30. <hr>

  31. <a name="SEC_Top"></a>

  32. 

  33. <a name="SEC_Contents"></a>

  34. <h1>Table of Contents</h1>

  35. 

  36. <div class="contents">

  37. 

  38. <ul class="no-bullet">

  39.   <li><a name="toc-Description" href="#Description">1 Description</a></li>

  40.   <li><a name="toc-Modes" href="#Modes">2 Modes</a>

  41.   <ul class="no-bullet">

  42.     <li><a name="toc-BROADCAST" href="#BROADCAST">2.1 BROADCAST</a></li>

  43.     <li><a name="toc-PIPE" href="#PIPE">2.2 PIPE</a></li>

  44.   </ul></li>

  45.   <li><a name="toc-Container_002dspecific-codec-tags" href="#Container_002dspecific-codec-tags">3 Container-specific codec tags</a>

  46.   <ul class="no-bullet">

  47.     <li><a name="toc-Generic-raw-YUVA-formats" href="#Generic-raw-YUVA-formats">3.1 Generic raw YUVA formats</a></li>

  48.     <li><a name="toc-Raw-Audio" href="#Raw-Audio">3.2 Raw Audio</a></li>

  49.     <li><a name="toc-Subtitles" href="#Subtitles">3.3 Subtitles</a></li>

  50.     <li><a name="toc-Raw-Data" href="#Raw-Data">3.4 Raw Data</a></li>

  51.     <li><a name="toc-Codecs" href="#Codecs">3.5 Codecs</a></li>

  52.   </ul>

  53. </li>

  54. </ul>

  55. </div>

  56. 

  57. 

  58. <hr size="6">

  59. <a name="Description"></a>

  60. <h1 class="chapter"><a href="nut.html#toc-Description">1 Description</a></h1>

  61. <p>NUT is a low overhead generic container format. It stores audio, video,

  62. subtitle and user-defined streams in a simple, yet efficient, way.

  63. </p>

  64. <p>It was created by a group of FFmpeg and MPlayer developers in 2003

  65. and was finalized in 2008.

  66. </p>

  67. <p>The official nut specification is at svn://svn.mplayerhq.hu/nut

  68. In case of any differences between this text and the official specification,

  69. the official specification shall prevail.

  70. </p>

  71. <a name="Modes"></a>

  72. <h1 class="chapter"><a href="nut.html#toc-Modes">2 Modes</a></h1>

  73. <p>NUT has some variants signaled by using the flags field in its main header.

  74. </p>

  75. <table>

  76. <tr><td width="40%">BROADCAST</td><td width="40%">Extend the syncpoint to report the sender wallclock</td></tr>

  77. <tr><td width="40%">PIPE</td><td width="40%">Omit completely the syncpoint</td></tr>

  78. </table>

  79. 

  80. <a name="BROADCAST"></a>

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

  82. 

  83. <p>The BROADCAST variant provides a secondary time reference to facilitate

  84. detecting endpoint latency and network delays.

  85. It assumes all the endpoint clocks are synchronized.

  86. To be used in real-time scenarios.

  87. </p>

  88. <a name="PIPE"></a>

  89. <h2 class="section"><a href="nut.html#toc-PIPE">2.2 PIPE</a></h2>

  90. 

  91. <p>The PIPE variant assumes NUT is used as non-seekable intermediate container,

  92. by not using syncpoint removes unneeded overhead and reduces the overall

  93. memory usage.

  94. </p>

  95. <a name="Container_002dspecific-codec-tags"></a>

  96. <h1 class="chapter"><a href="nut.html#toc-Container_002dspecific-codec-tags">3 Container-specific codec tags</a></h1>

  97. 

  98. <a name="Generic-raw-YUVA-formats"></a>

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

  100. 

  101. <p>Since many exotic planar YUVA pixel formats are not considered by

  102. the AVI/QuickTime FourCC lists, the following scheme is adopted for

  103. representing them.

  104. </p>

  105. <p>The first two bytes can contain the values:

  106. Y1 = only Y

  107. Y2 = Y+A

  108. Y3 = YUV

  109. Y4 = YUVA

  110. </p>

  111. <p>The third byte represents the width and height chroma subsampling

  112. values for the UV planes, that is the amount to shift the luma

  113. width/height right to find the chroma width/height.

  114. </p>

  115. <p>The fourth byte is the number of bits used (8, 16, ...).

  116. </p>

  117. <p>If the order of bytes is inverted, that means that each component has

  118. to be read big-endian.

  119. </p>

  120. <a name="Raw-Audio"></a>

  121. <h2 class="section"><a href="nut.html#toc-Raw-Audio">3.2 Raw Audio</a></h2>

  122. 

  123. <table>

  124. <tr><td width="40%">ALAW</td><td width="40%">A-LAW</td></tr>

  125. <tr><td width="40%">ULAW</td><td width="40%">MU-LAW</td></tr>

  126. <tr><td width="40%">P&lt;type&gt;&lt;interleaving&gt;&lt;bits&gt;</td><td width="40%">little-endian PCM</td></tr>

  127. <tr><td width="40%">&lt;bits&gt;&lt;interleaving&gt;&lt;type&gt;P</td><td width="40%">big-endian PCM</td></tr>

  128. </table>

  129. 

  130. <p>&lt;type&gt; is S for signed integer, U for unsigned integer, F for IEEE float

  131. &lt;interleaving&gt; is D for default, P is for planar.

  132. &lt;bits&gt; is 8/16/24/32

  133. </p>

  134. <div class="example">

  135. <pre class="example">PFD[32]   would for example be signed 32 bit little-endian IEEE float

  136. </pre></div>

  137. 

  138. <a name="Subtitles"></a>

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

  140. 

  141. <table>

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

  143. <tr><td width="40%">SSA[0]</td><td width="40%">SubStation Alpha</td></tr>

  144. <tr><td width="40%">DVDS</td><td width="40%">DVD subtitles</td></tr>

  145. <tr><td width="40%">DVBS</td><td width="40%">DVB subtitles</td></tr>

  146. </table>

  147. 

  148. <a name="Raw-Data"></a>

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

  150. 

  151. <table>

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

  153. </table>

  154. 

  155. <a name="Codecs"></a>

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

  157. 

  158. <table>

  159. <tr><td width="40%">3IV1</td><td width="40%">non-compliant MPEG-4 generated by old 3ivx</td></tr>

  160. <tr><td width="40%">ASV1</td><td width="40%">Asus Video</td></tr>

  161. <tr><td width="40%">ASV2</td><td width="40%">Asus Video 2</td></tr>

  162. <tr><td width="40%">CVID</td><td width="40%">Cinepak</td></tr>

  163. <tr><td width="40%">CYUV</td><td width="40%">Creative YUV</td></tr>

  164. <tr><td width="40%">DIVX</td><td width="40%">non-compliant MPEG-4 generated by old DivX</td></tr>

  165. <tr><td width="40%">DUCK</td><td width="40%">Truemotion 1</td></tr>

  166. <tr><td width="40%">FFV1</td><td width="40%">FFmpeg video 1</td></tr>

  167. <tr><td width="40%">FFVH</td><td width="40%">FFmpeg Huffyuv</td></tr>

  168. <tr><td width="40%">H261</td><td width="40%">ITU H.261</td></tr>

  169. <tr><td width="40%">H262</td><td width="40%">ITU H.262</td></tr>

  170. <tr><td width="40%">H263</td><td width="40%">ITU H.263</td></tr>

  171. <tr><td width="40%">H264</td><td width="40%">ITU H.264</td></tr>

  172. <tr><td width="40%">HFYU</td><td width="40%">Huffyuv</td></tr>

  173. <tr><td width="40%">I263</td><td width="40%">Intel H.263</td></tr>

  174. <tr><td width="40%">IV31</td><td width="40%">Indeo 3.1</td></tr>

  175. <tr><td width="40%">IV32</td><td width="40%">Indeo 3.2</td></tr>

  176. <tr><td width="40%">IV50</td><td width="40%">Indeo 5.0</td></tr>

  177. <tr><td width="40%">LJPG</td><td width="40%">ITU JPEG (lossless)</td></tr>

  178. <tr><td width="40%">MJLS</td><td width="40%">ITU JPEG-LS</td></tr>

  179. <tr><td width="40%">MJPG</td><td width="40%">ITU JPEG</td></tr>

  180. <tr><td width="40%">MPG4</td><td width="40%">MS MPEG-4v1 (not ISO MPEG-4)</td></tr>

  181. <tr><td width="40%">MP42</td><td width="40%">MS MPEG-4v2</td></tr>

  182. <tr><td width="40%">MP43</td><td width="40%">MS MPEG-4v3</td></tr>

  183. <tr><td width="40%">MP4V</td><td width="40%">ISO MPEG-4 Part 2 Video (from old encoders)</td></tr>

  184. <tr><td width="40%">mpg1</td><td width="40%">ISO MPEG-1 Video</td></tr>

  185. <tr><td width="40%">mpg2</td><td width="40%">ISO MPEG-2 Video</td></tr>

  186. <tr><td width="40%">MRLE</td><td width="40%">MS RLE</td></tr>

  187. <tr><td width="40%">MSVC</td><td width="40%">MS Video 1</td></tr>

  188. <tr><td width="40%">RT21</td><td width="40%">Indeo 2.1</td></tr>

  189. <tr><td width="40%">RV10</td><td width="40%">RealVideo 1.0</td></tr>

  190. <tr><td width="40%">RV20</td><td width="40%">RealVideo 2.0</td></tr>

  191. <tr><td width="40%">RV30</td><td width="40%">RealVideo 3.0</td></tr>

  192. <tr><td width="40%">RV40</td><td width="40%">RealVideo 4.0</td></tr>

  193. <tr><td width="40%">SNOW</td><td width="40%">FFmpeg Snow</td></tr>

  194. <tr><td width="40%">SVQ1</td><td width="40%">Sorenson Video 1</td></tr>

  195. <tr><td width="40%">SVQ3</td><td width="40%">Sorenson Video 3</td></tr>

  196. <tr><td width="40%">theo</td><td width="40%">Xiph Theora</td></tr>

  197. <tr><td width="40%">TM20</td><td width="40%">Truemotion 2.0</td></tr>

  198. <tr><td width="40%">UMP4</td><td width="40%">non-compliant MPEG-4 generated by UB Video MPEG-4</td></tr>

  199. <tr><td width="40%">VCR1</td><td width="40%">ATI VCR1</td></tr>

  200. <tr><td width="40%">VP30</td><td width="40%">VP 3.0</td></tr>

  201. <tr><td width="40%">VP31</td><td width="40%">VP 3.1</td></tr>

  202. <tr><td width="40%">VP50</td><td width="40%">VP 5.0</td></tr>

  203. <tr><td width="40%">VP60</td><td width="40%">VP 6.0</td></tr>

  204. <tr><td width="40%">VP61</td><td width="40%">VP 6.1</td></tr>

  205. <tr><td width="40%">VP62</td><td width="40%">VP 6.2</td></tr>

  206. <tr><td width="40%">VP70</td><td width="40%">VP 7.0</td></tr>

  207. <tr><td width="40%">WMV1</td><td width="40%">MS WMV7</td></tr>

  208. <tr><td width="40%">WMV2</td><td width="40%">MS WMV8</td></tr>

  209. <tr><td width="40%">WMV3</td><td width="40%">MS WMV9</td></tr>

  210. <tr><td width="40%">WV1F</td><td width="40%">non-compliant MPEG-4 generated by ?</td></tr>

  211. <tr><td width="40%">WVC1</td><td width="40%">VC-1</td></tr>

  212. <tr><td width="40%">XVID</td><td width="40%">non-compliant MPEG-4 generated by old Xvid</td></tr>

  213. <tr><td width="40%">XVIX</td><td width="40%">non-compliant MPEG-4 generated by old Xvid with interlacing bug</td></tr>

  214. </table>

  215. 

  216.     </div>

  217.   </body>

  218. </html>