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<li class="toctree-l3 current"><a class="current reference internal" href="#">SelectEvery</a><ul>
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<li class="toctree-l4"><a class="reference internal" href="#std.SelectEvery"><code class="docutils literal notranslate"><span class="pre">SelectEvery()</span></code></a></li>
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<section id="selectevery">
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<h1>SelectEvery<a class="headerlink" href="#selectevery" title="Permalink to this heading"></a></h1>
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<dl class="py function">
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<dt class="sig sig-object py" id="std.SelectEvery">
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<span class="sig-prename descclassname"><span class="pre">std.</span></span><span class="sig-name descname"><span class="pre">SelectEvery</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">vnode</span> <span class="pre">clip</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">int</span> <span class="pre">cycle</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">int[]</span> <span class="pre">offsets</span></span></em><span class="optional">[</span>, <em class="sig-param"><span class="n"><span class="pre">bint</span> <span class="pre">modify_duration=True</span></span></em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#std.SelectEvery" title="Permalink to this definition"></a></dt>
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<dd><p>Returns a clip with only some of the frames in every <em>cycle</em> selected. The
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<em>offsets</em> given must be between 0 and <em>cycle</em> - 1.</p>
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<p>Below are some examples of useful operations.</p>
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<p>Return even numbered frames, starting with 0:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">SelectEvery</span><span class="p">(</span><span class="n">clip</span><span class="o">=</span><span class="n">clip</span><span class="p">,</span> <span class="n">cycle</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">offsets</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
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</pre></div>
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</div>
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<p>Return odd numbered frames, starting with 1:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">SelectEvery</span><span class="p">(</span><span class="n">clip</span><span class="o">=</span><span class="n">clip</span><span class="p">,</span> <span class="n">cycle</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">offsets</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
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</pre></div>
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</div>
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<p>Fixed pattern 1 in 5 decimation, first frame in every cycle removed:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">SelectEvery</span><span class="p">(</span><span class="n">clip</span><span class="o">=</span><span class="n">clip</span><span class="p">,</span> <span class="n">cycle</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="n">offsets</span><span class="o">=</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">])</span>
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</pre></div>
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</div>
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<p>Duplicate every fourth frame:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">SelectEvery</span><span class="p">(</span><span class="n">clip</span><span class="o">=</span><span class="n">clip</span><span class="p">,</span> <span class="n">cycle</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="n">offsets</span><span class="o">=</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">3</span><span class="p">])</span>
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</pre></div>
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</div>
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<p>In Python, std.SelectEvery can also be invoked by <a class="reference internal" href="../../pythonreference.html#pythonreference"><span class="std std-ref">slicing a clip</span></a>.</p>
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<p>If <em>modify_duration</em> is set the clip’s frame rate is multiplied by the number
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of offsets and divided by <em>cycle</em>. The frame durations are adjusted in the same manner.</p>
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