【多媒体封装格式详解】---MP4【1】

缺乏、安全感 2022-02-02 20:05 380阅读 0赞

**MP4**(MPEG-4 Part 14)是一种常见的多媒体容器格式，它是在“ISO/IEC 14496-14”标准文件中定义的。

## **1.最小组成单元 BOX** ##

像FLV的tag、MKV的EBML、ASF文件中的 ASF object.mp4 是由一系列的box组成，他的最小组成单元就是box.

![1357284253_2203.png][]

**size;**指明了整个box所占用的大小，包括header部分.

**type;**表示这个box的类型。(附表1)

**largesize;**如果box很大超过了uint32的最大数值，size就被设置为1，并用接下来的 **largesize**来存放大小。

## 2.mp4文件整体结构 ##

![1357526660_8318.jpg][]

mp4文件说白了就是一系列box组成，大box里面有小box。

接下来会深入到具体的box里面，来具体分析mp4格式

未完待续.....

附表1

<table style="width:597px;"> 
 <tbody> 
  <tr> 
   <td><strong>Code</strong></td> 
   <td><strong>Abstract</strong></td> 
   <td><strong>Defined in/by</strong></td> 
  </tr> 
  <tr> 
   <td>ainf</td> 
   <td>Asset information to identify, license and play</td> 
   <td><a href="http://mp4ra.org/specs.html#DECE10" rel="nofollow">DECE</a></td> 
  </tr> 
  <tr> 
   <td>albm</td> 
   <td>Album title and track number (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>auth</td> 
   <td>Media author name (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>avcn</td> 
   <td>AVC NAL Unit Storage Box</td> 
   <td><a href="http://mp4ra.org/specs.html#DECE10" rel="nofollow">DECE</a></td> 
  </tr> 
  <tr> 
   <td>bloc</td> 
   <td>Base location and purchase location for license acquisition</td> 
   <td><a href="http://mp4ra.org/specs.html#DECE10" rel="nofollow">DECE</a></td> 
  </tr> 
  <tr> 
   <td>bpcc</td> 
   <td>Bits per component</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>buff</td> 
   <td>Buffering information</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC</a></td> 
  </tr> 
  <tr> 
   <td>bxml</td> 
   <td>binary XML container</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>ccid</td> 
   <td>OMA DRM Content ID</td> 
   <td><a href="http://mp4ra.org/specs.html#omadcf21" rel="nofollow">OMA DRM 2.1</a></td> 
  </tr> 
  <tr> 
   <td>cdef</td> 
   <td>type and ordering of the components within the codestream</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>clsf</td> 
   <td>Media classification (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>cmap</td> 
   <td>mapping between a palette and codestream components</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>co64</td> 
   <td>64-bit chunk offset</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>colr</td> 
   <td>specifies the colourspace of the image</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>cprt</td> 
   <td>copyright etc. (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>crhd</td> 
   <td>reserved for ClockReferenceStream header</td> 
   <td><a href="http://mp4ra.org/specs.html#MP4V1" rel="nofollow">MP4V1</a></td> 
  </tr> 
  <tr> 
   <td>cslg</td> 
   <td>composition to decode timeline mapping</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>ctts</td> 
   <td>(composition) time to sample</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>cvru</td> 
   <td>OMA DRM Cover URI</td> 
   <td><a href="http://mp4ra.org/specs.html#omadcf21" rel="nofollow">OMA DRM 2.1</a></td> 
  </tr> 
  <tr> 
   <td>dcfD</td> 
   <td>Marlin DCF Duration, user-data atom type</td> 
   <td><a href="http://mp4ra.org/specs.html#OMarlin" rel="nofollow">OMArlin</a></td> 
  </tr> 
  <tr> 
   <td>dinf</td> 
   <td>data information box, container</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>dref</td> 
   <td>data reference box, declares source(s) of media data in track</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>dscp</td> 
   <td>Media description (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>dsgd</td> 
   <td>DVB Sample Group Description Box</td> 
   <td><a href="http://mp4ra.org/specs.html#DVBa121" rel="nofollow">DVB</a></td> 
  </tr> 
  <tr> 
   <td>dstg</td> 
   <td>DVB Sample to Group Box</td> 
   <td><a href="http://mp4ra.org/specs.html#DVBa121" rel="nofollow">DVB</a></td> 
  </tr> 
  <tr> 
   <td>edts</td> 
   <td>edit list container</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>elst</td> 
   <td>an edit list</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>feci</td> 
   <td>FEC Informatiom</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>fecr</td> 
   <td>FEC Reservoir</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>fiin</td> 
   <td>FD Item Information</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>fire</td> 
   <td>File Reservoir</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>fpar</td> 
   <td>File Partition</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>free</td> 
   <td>free space</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>frma</td> 
   <td>original format box</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>ftyp</td> 
   <td>file type and compatibility</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a>,&nbsp;<a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>gitn</td> 
   <td>Group ID to name</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>gnre</td> 
   <td>Media genre (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>grpi</td> 
   <td>OMA DRM Group ID</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>hdlr</td> 
   <td>handler, declares the media (handler) type</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>hmhd</td> 
   <td>hint media header, overall information (hint track only)</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>hpix</td> 
   <td>Hipix Rich Picture (user-data or meta-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#hum-mon" rel="nofollow">HIPIX</a></td> 
  </tr> 
  <tr> 
   <td>icnu</td> 
   <td>OMA DRM Icon URI</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>ID32</td> 
   <td>ID3 version 2 container</td> 
   <td><a href="http://mp4ra.org/specs.html#id3v2" rel="nofollow">inline</a></td> 
  </tr> 
  <tr> 
   <td>idat</td> 
   <td>Item data</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>ihdr</td> 
   <td>Image Header</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>iinf</td> 
   <td>item information</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>iloc</td> 
   <td>item location</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>imif</td> 
   <td>IPMP Information box</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>infu</td> 
   <td>OMA DRM Info URL</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>iods</td> 
   <td>Object Descriptor container box</td> 
   <td><a href="http://mp4ra.org/specs.html#MP4V1" rel="nofollow">MP4V1</a></td> 
  </tr> 
  <tr> 
   <td>iphd</td> 
   <td>reserved for IPMP Stream header</td> 
   <td><a href="http://mp4ra.org/specs.html#MP4V1" rel="nofollow">MP4V1</a></td> 
  </tr> 
  <tr> 
   <td>ipmc</td> 
   <td>IPMP Control Box</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>ipro</td> 
   <td>item protection</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>iref</td> 
   <td>Item reference</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>jP$20$20</td> 
   <td>JPEG 2000 Signature</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>jp2c</td> 
   <td>JPEG 2000 contiguous codestream</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>jp2h</td> 
   <td>Header</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>jp2i</td> 
   <td>intellectual property information</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>kywd</td> 
   <td>Media keywords (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>loci</td> 
   <td>Media location information (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>lrcu</td> 
   <td>OMA DRM Lyrics URI</td> 
   <td><a href="http://mp4ra.org/specs.html#omadcf21" rel="nofollow">OMA DRM 2.1</a></td> 
  </tr> 
  <tr> 
   <td>m7hd</td> 
   <td>reserved for MPEG7Stream header</td> 
   <td><a href="http://mp4ra.org/specs.html#MP4V1" rel="nofollow">MP4V1</a></td> 
  </tr> 
  <tr> 
   <td>mdat</td> 
   <td>media data container</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mdhd</td> 
   <td>media header, overall information about the media</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mdia</td> 
   <td>container for the media information in a track</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mdri</td> 
   <td>Mutable DRM information</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>meco</td> 
   <td>additional metadata container</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mehd</td> 
   <td>movie extends header box</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mere</td> 
   <td>metabox relation</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>meta</td> 
   <td>Metadata container</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mfhd</td> 
   <td>movie fragment header</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mfra</td> 
   <td>Movie fragment random access</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mfro</td> 
   <td>Movie fragment random access offset</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>minf</td> 
   <td>media information container</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mjhd</td> 
   <td>reserved for MPEG-J Stream header</td> 
   <td><a href="http://mp4ra.org/specs.html#MP4V1" rel="nofollow">MP4V1</a></td> 
  </tr> 
  <tr> 
   <td>moof</td> 
   <td>movie fragment</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>moov</td> 
   <td>container for all the meta-data</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mvcg</td> 
   <td>Multiview group</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC</a></td> 
  </tr> 
  <tr> 
   <td>mvci</td> 
   <td>Multiview Information</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC</a></td> 
  </tr> 
  <tr> 
   <td>mvex</td> 
   <td>movie extends box</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mvhd</td> 
   <td>movie header, overall declarations</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>mvra</td> 
   <td>Multiview Relation Attribute</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC</a></td> 
  </tr> 
  <tr> 
   <td>nmhd</td> 
   <td>Null media header, overall information (some tracks only)</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>ochd</td> 
   <td>reserved for ObjectContentInfoStream header</td> 
   <td><a href="http://mp4ra.org/specs.html#MP4V1" rel="nofollow">MP4V1</a></td> 
  </tr> 
  <tr> 
   <td>odaf</td> 
   <td>OMA DRM Access Unit Format</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>odda</td> 
   <td>OMA DRM Content Object</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>odhd</td> 
   <td>reserved for ObjectDescriptorStream header</td> 
   <td><a href="http://mp4ra.org/specs.html#MP4V1" rel="nofollow">MP4V1</a></td> 
  </tr> 
  <tr> 
   <td>odhe</td> 
   <td>OMA DRM Discrete Media Headers</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>odrb</td> 
   <td>OMA DRM Rights Object</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>odrm</td> 
   <td>OMA DRM Container</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>odtt</td> 
   <td>OMA DRM Transaction Tracking</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>ohdr</td> 
   <td>OMA DRM Common headers</td> 
   <td><a href="http://mp4ra.org/specs.html#OMADCF" rel="nofollow">OMA DRM 2.0</a></td> 
  </tr> 
  <tr> 
   <td>padb</td> 
   <td>sample padding bits</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>paen</td> 
   <td>Partition Entry</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>pclr</td> 
   <td>palette which maps a single component in index space to a multiple- component image</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>pdin</td> 
   <td>Progressive download information</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>perf</td> 
   <td>Media performer name (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>pitm</td> 
   <td>primary item reference</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>res$20</td> 
   <td>grid resolution</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>resc</td> 
   <td>grid resolution at which the image was captured</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>resd</td> 
   <td>default grid resolution at which the image should be displayed</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>rtng</td> 
   <td>Media rating (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>sbgp</td> 
   <td>Sample to Group box</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC,&nbsp;</a><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>schi</td> 
   <td>scheme information box</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>schm</td> 
   <td>scheme type box</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>sdep</td> 
   <td>Sample dependency</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC</a></td> 
  </tr> 
  <tr> 
   <td>sdhd</td> 
   <td>reserved for SceneDescriptionStream header</td> 
   <td><a href="http://mp4ra.org/specs.html#MP4V1" rel="nofollow">MP4V1</a></td> 
  </tr> 
  <tr> 
   <td>sdtp</td> 
   <td>Independent and Disposable Samples Box</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC,&nbsp;</a><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>sdvp</td> 
   <td>SD Profile Box</td> 
   <td><a href="http://mp4ra.org/specs.html#SDV" rel="nofollow">SDV</a></td> 
  </tr> 
  <tr> 
   <td>segr</td> 
   <td>file delivery session group</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>senc</td> 
   <td>Sample specific encryption data</td> 
   <td><a href="http://mp4ra.org/specs.html#DECE10" rel="nofollow">DECE</a></td> 
  </tr> 
  <tr> 
   <td>sgpd</td> 
   <td>Sample group definition box</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC,&nbsp;</a><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>sidx</td> 
   <td>Segment Index Box</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>sinf</td> 
   <td>protection scheme information box</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>skip</td> 
   <td>free space</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>smhd</td> 
   <td>sound media header, overall information (sound track only)</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>srmb</td> 
   <td>System Renewability Message</td> 
   <td><a href="http://mp4ra.org/specs.html#DVBa121" rel="nofollow">DVB</a></td> 
  </tr> 
  <tr> 
   <td>srmc</td> 
   <td>System Renewability Message container</td> 
   <td><a href="http://mp4ra.org/specs.html#DVBa121" rel="nofollow">DVB</a></td> 
  </tr> 
  <tr> 
   <td>srpp</td> 
   <td>STRP Process</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>stbl</td> 
   <td>sample table box, container for the time/space map</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>stco</td> 
   <td>chunk offset, partial data-offset information</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>stdp</td> 
   <td>sample degradation priority</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>sthd</td> 
   <td>Subtitle Media Header Box</td> 
   <td><a href="http://mp4ra.org/specs.html#DECE10" rel="nofollow">DECE</a></td> 
  </tr> 
  <tr> 
   <td>stsc</td> 
   <td>sample-to-chunk, partial data-offset information</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>stsd</td> 
   <td>sample descriptions (codec types, initialization etc.)</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>stsh</td> 
   <td>shadow sync sample table</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>stss</td> 
   <td>sync sample table (random access points)</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>stsz</td> 
   <td>sample sizes (framing)</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>stts</td> 
   <td>(decoding) time-to-sample</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>styp</td> 
   <td>Segment Type Box</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>stz2</td> 
   <td>compact sample sizes (framing)</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>subs</td> 
   <td>Sub-sample information</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>swtc</td> 
   <td>Multiview Group Relation</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC</a></td> 
  </tr> 
  <tr> 
   <td>tfad</td> 
   <td>Track fragment adjustment box</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>tfhd</td> 
   <td>Track fragment header</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>tfma</td> 
   <td>Track fragment media adjustment box</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>tfra</td> 
   <td>Track fragment radom access</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>tibr</td> 
   <td>Tier Bit rate</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC</a></td> 
  </tr> 
  <tr> 
   <td>tiri</td> 
   <td>Tier Information</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC</a></td> 
  </tr> 
  <tr> 
   <td>titl</td> 
   <td>Media title (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>tkhd</td> 
   <td>Track header, overall information about the track</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>traf</td> 
   <td>Track fragment</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>trak</td> 
   <td>container for an individual track or stream</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>tref</td> 
   <td>track reference container</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>trex</td> 
   <td>track extends defaults</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>trgr</td> 
   <td>Track grouping information</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>trik</td> 
   <td>Facilitates random access and trick play modes</td> 
   <td><a href="http://mp4ra.org/specs.html#DECE10" rel="nofollow">DECE</a></td> 
  </tr> 
  <tr> 
   <td>trun</td> 
   <td>track fragment run</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>tsel</td> 
   <td>Track selection (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
  <tr> 
   <td>udta</td> 
   <td>user-data</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>uinf</td> 
   <td>a tool by which a vendor may provide access to additional information associated with a UUID</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>UITS</td> 
   <td>Unique Identifier Technology Solution</td> 
   <td><a href="http://mp4ra.org/specs.html#UMG" rel="nofollow">Universal Music</a></td> 
  </tr> 
  <tr> 
   <td>ulst</td> 
   <td>a list of UUID’s</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>url$20</td> 
   <td>a URL</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>uuid</td> 
   <td>user-extension box</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO,&nbsp;JP2</a></td> 
  </tr> 
  <tr> 
   <td>vmhd</td> 
   <td>video media header, overall information (video track only)</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>vwdi</td> 
   <td>Multiview Scene Information</td> 
   <td><a href="http://mp4ra.org/specs.html#AVC" rel="nofollow">AVC</a></td> 
  </tr> 
  <tr> 
   <td>xml$20</td> 
   <td>a tool by which vendors can add XML formatted information</td> 
   <td><a href="http://mp4ra.org/specs.html#JPEG2000" rel="nofollow">JP2</a></td> 
  </tr> 
  <tr> 
   <td>xml$20</td> 
   <td>XML container</td> 
   <td><a href="http://mp4ra.org/specs.html#ISO" rel="nofollow">ISO</a></td> 
  </tr> 
  <tr> 
   <td>yrrc</td> 
   <td>Year when media was recorded (user-data)</td> 
   <td><a href="http://mp4ra.org/specs.html#3GPP" rel="nofollow">3GPP</a></td> 
  </tr> 
 </tbody> 
</table>

**QuickTime Codes**

[1357284253_2203.png]: https://img-my.csdn.net/uploads/201301/04/1357284253_2203.png
[1357526660_8318.jpg]: https://img-my.csdn.net/uploads/201301/07/1357526660_8318.jpg