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VapourSynth
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R64
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<section id="getting-started">
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<h1>Getting Started<a class="headerlink" href="#getting-started" title="Permalink to this heading"></a></h1>
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<p>So you managed to install VapourSynth. Now what?</p>
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<p>If you don’t know the basics of Python, you may want to check out a
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<a class="reference external" href="https://learnxinyminutes.com/docs/python3/">tutorial</a>.</p>
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<p>You can “play around” in the python interpreter if you want, but that’s not how
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most scripts are created.</p>
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<section id="example-script">
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<h2>Example Script<a class="headerlink" href="#example-script" title="Permalink to this heading"></a></h2>
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<p>It all starts with a <em>.vpy</em> script.
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Here’s a sample script to be inspired by, it assumes that <a class="reference external" href="https://github.com/vapoursynth/bestsource">BestSource</a>
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is installed and <a class="reference internal" href="installation.html"><span class="doc">auto-loaded</span></a>.</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">vapoursynth</span> <span class="kn">import</span> <span class="n">core</span> <span class="c1"># Get an instance of the core</span>
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<span class="n">clip</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">bs</span><span class="o">.</span><span class="n">VideoSource</span><span class="p">(</span><span class="n">source</span><span class="o">=</span><span class="s1">'filename.mkv'</span><span class="p">)</span> <span class="c1"># Load a video track in mkv file</span>
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<span class="n">clip</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">std</span><span class="o">.</span><span class="n">FlipHorizontal</span><span class="p">(</span><span class="n">clip</span><span class="p">)</span> <span class="c1"># Flip the video clip in the horizontal direction</span>
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<span class="n">clip</span><span class="o">.</span><span class="n">set_output</span><span class="p">()</span> <span class="c1"># Set the video clip to be accessible for output</span>
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</pre></div>
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</div>
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<p>Audio is also supported, use <a class="reference external" href="https://github.com/vapoursynth/bestsource">BestSource</a> to load your audio file.</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">vapoursynth</span> <span class="kn">import</span> <span class="n">core</span> <span class="c1"># Get an instance of the core</span>
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<span class="n">clip</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">bs</span><span class="o">.</span><span class="n">AudioSource</span><span class="p">(</span><span class="n">source</span><span class="o">=</span><span class="s1">'filename.mkv'</span><span class="p">)</span> <span class="c1"># Load an audio track in mkv file</span>
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<span class="n">clip</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">std</span><span class="o">.</span><span class="n">AudioGain</span><span class="p">(</span><span class="n">clip</span><span class="p">,</span><span class="n">gain</span><span class="o">=</span><span class="mf">2.0</span><span class="p">)</span> <span class="c1"># Gain all channels 2x</span>
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<span class="n">clip</span><span class="o">.</span><span class="n">set_output</span><span class="p">()</span> <span class="c1"># Set the audio clip to be accessible for output</span>
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</pre></div>
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</div>
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<p>You can combine 2 operations in one script.</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">vapoursynth</span> <span class="kn">import</span> <span class="n">core</span>
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<span class="n">video</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">bs</span><span class="o">.</span><span class="n">VideoSource</span><span class="p">(</span><span class="n">source</span><span class="o">=</span><span class="s1">'filename.mkv'</span><span class="p">)</span>
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<span class="n">audio</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">bs</span><span class="o">.</span><span class="n">AudioSource</span><span class="p">(</span><span class="n">source</span><span class="o">=</span><span class="s1">'filename.mkv'</span><span class="p">)</span>
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<span class="n">video</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">std</span><span class="o">.</span><span class="n">FlipHorizontal</span><span class="p">(</span><span class="n">video</span><span class="p">)</span>
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<span class="n">audio</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">std</span><span class="o">.</span><span class="n">AudioGain</span><span class="p">(</span><span class="n">audio</span><span class="p">,</span><span class="n">gain</span><span class="o">=</span><span class="mf">2.0</span><span class="p">)</span>
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<span class="n">video</span><span class="o">.</span><span class="n">set_output</span><span class="p">(</span><span class="n">index</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
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<span class="n">audio</span><span class="o">.</span><span class="n">set_output</span><span class="p">(</span><span class="n">index</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>Remember that most VapourSynth objects have a quite nice string representation
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in Python, so if you want to know more about an instance just call <code class="docutils literal notranslate"><span class="pre">print()</span></code>.</p>
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</section>
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<section id="preview">
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<h2>Preview<a class="headerlink" href="#preview" title="Permalink to this heading"></a></h2>
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<p>It’s possible to directly open the script in <a class="reference external" href="https://github.com/YomikoR/VapourSynth-Editor">VapourSynth Editor</a>
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or <a class="reference external" href="https://sourceforge.net/projects/vdfiltermod/">VirtualDub FilterMod</a> for previewing.</p>
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</section>
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<section id="output-with-vspipe">
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<h2>Output with VSPipe<a class="headerlink" href="#output-with-vspipe" title="Permalink to this heading"></a></h2>
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<p>VSPipe is very useful to pipe the output to various applications, for example x264 and flac for encoding.</p>
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<p>Here are some examples of command lines that automatically pass on most video and audio attributes.</p>
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<p>For x264:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">vspipe</span> <span class="o">-</span><span class="n">c</span> <span class="n">y4m</span> <span class="n">script</span><span class="o">.</span><span class="n">vpy</span> <span class="o">-</span> <span class="o">|</span> <span class="n">x264</span> <span class="o">--</span><span class="n">demuxer</span> <span class="n">y4m</span> <span class="o">-</span> <span class="o">--</span><span class="n">output</span> <span class="n">encoded</span><span class="mf">.264</span>
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</pre></div>
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</div>
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<p>For flac:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">vspipe</span> <span class="o">-</span><span class="n">c</span> <span class="n">wav</span> <span class="n">script</span><span class="o">.</span><span class="n">vpy</span> <span class="o">-</span> <span class="o">|</span> <span class="n">flac</span> <span class="o">-</span> <span class="o">-</span><span class="n">o</span> <span class="n">encoded</span><span class="o">.</span><span class="n">flac</span>
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</pre></div>
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</div>
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<p>For FFmpeg:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">vspipe</span> <span class="o">-</span><span class="n">c</span> <span class="n">y4m</span> <span class="n">script</span><span class="o">.</span><span class="n">vpy</span> <span class="o">-</span> <span class="o">|</span> <span class="n">ffmpeg</span> <span class="o">-</span><span class="n">i</span> <span class="o">-</span> <span class="n">encoded</span><span class="o">.</span><span class="n">mkv</span>
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</pre></div>
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</div>
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<p>For mpv:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">vspipe</span> <span class="o">-</span><span class="n">c</span> <span class="n">y4m</span> <span class="n">script</span><span class="o">.</span><span class="n">vpy</span> <span class="o">-</span> <span class="o">|</span> <span class="n">mpv</span> <span class="o">-</span>
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<span class="n">vspipe</span> <span class="o">-</span><span class="n">c</span> <span class="n">wav</span> <span class="n">script</span><span class="o">.</span><span class="n">vpy</span> <span class="o">-</span> <span class="o">|</span> <span class="n">mpv</span> <span class="o">-</span>
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</pre></div>
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</div>
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</section>
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