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<title>Segment template formatting — Shaka Packager documentation</title>
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<li class="nav-item nav-item-this"><a href="">Segment template formatting</a></li>
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<section id="segment-template-formatting">
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<h1>Segment template formatting<a class="headerlink" href="#segment-template-formatting" title="Permalink to this headline">¶</a></h1>
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<p>The implementation is based on <em>Template-based Segment URL construction</em>
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described in ISO/IEC 23009-1:2014.</p>
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<table class="styled-table docutils align-default" id="id1">
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<caption><span class="caption-text">Supported identifiers</span><a class="headerlink" href="#id1" title="Permalink to this table">¶</a></caption>
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<colgroup>
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<col style="width: 19%" />
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<col style="width: 41%" />
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<col style="width: 41%" />
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</colgroup>
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<thead>
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<tr class="row-odd"><th class="left-align head"><p>$<Identifier>$</p></th>
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<th class="left-align head"><p>Substitution parameter</p></th>
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<th class="left-align head"><p>Format</p></th>
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</tr>
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</thead>
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<tbody>
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<tr class="row-even"><td class="left-align"><p>$$</p></td>
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<td class="left-align"><p>is an escape sequence, i.e.
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“$$” is replaced with a single
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“$”.</p></td>
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<td class="left-align"><p>Not applicable.</p></td>
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</tr>
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<tr class="row-odd"><td class="left-align"><p>$Number$</p></td>
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<td class="left-align"><p>This identifier is substitued
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with the <em>number</em> of the
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corresponding Segment.</p></td>
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<td class="left-align"><p>The format tag may be present.</p>
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<p>If no format tag is present, a
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default format tag with
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<em>width</em>=1 shall be used.</p>
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</td>
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</tr>
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<tr class="row-even"><td class="left-align"><p>$Time$</p></td>
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<td class="left-align"><p>This identifier is substituted
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with the value of the
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<strong>SegmentTimeline@t</strong>
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attribute for the Segment
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being accessed. Either
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$Number$ or $Time$ may be used
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but not both at the same time.</p></td>
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<td class="left-align"><p>The format tag may be present.</p>
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<p>If no format tag is present, a
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default format tag with
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<em>width</em>=1 shall be used.</p>
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</td>
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</tr>
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</tbody>
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</table>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>Identifiers $RepresentationID$ and $Bandwidth$ are not supported in this
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version. Please file an <a class="reference external" href="https://github.com/google/shaka-packager/issues">issue</a> if you want it to be
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supported.</p>
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</div>
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<p>In each URL, the identifiers shall be replaced by the substitution parameter
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per the definition in the above table. Identifier matching is case-sensitive.</p>
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<p>Each identifier may be suffixed, within the enclosing ‘$’ characters, with an
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additional format tag aligned with the <em>printf</em> format tag as defined in IEEE
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1003.1-2008 following this prototype:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">%</span><span class="mi">0</span><span class="p">[</span><span class="n">width</span><span class="p">]</span><span class="n">d</span>
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</pre></div>
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</div>
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<p>The <em>width</em> parameter is an unsigned integer that provides the minimum number
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of characters to be printed. If the value to be printed is shorter than this
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number, the result shall be padded with zeros. The value is not truncated even
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if the result is larger.</p>
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<p>Strings outside identifiers shall only contain characters that are permitted
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within URLs according to RFC 3986.</p>
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