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<section id="frameeval">
<h1>FrameEval<a class="headerlink" href="#frameeval" title="Permalink to this heading"></a></h1>
<dl class="py function">
<dt class="sig sig-object py" id="std.FrameEval">
<span class="sig-prename descclassname"><span class="pre">std.</span></span><span class="sig-name descname"><span class="pre">FrameEval</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">func</span> <span class="pre">eval</span></span></em><span class="optional">[</span>, <em class="sig-param"><span class="n"><span class="pre">vnode[]</span> <span class="pre">prop_src</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">vnode[]</span> <span class="pre">clip_src</span></span></em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#std.FrameEval" title="Permalink to this definition"></a></dt>
<dd><p>Allows an arbitrary function to be evaluated every frame. The function gets
the frame number, <em>n</em>, as input and should return a clip the output frame can
be requested from.</p>
<p>The <em>clip</em> argument is only used to get the output format from since there is
no reliable automatic way to deduce it.</p>
<p>When using the argument <em>prop_src</em> the function will also have an argument,
<em>f</em>, containing the current frames. This is mainly so frame properties can be
accessed and used to make decisions. Note that <em>f</em> will only be a list if
more than one <em>prop_src</em> clip is provided.</p>
<p>The <em>clip_src</em> argument only exists as a way to hint which clips are referenced in the
<em>eval</em> function which can improve caching and graph generation. Its use is encouraged
but not required.</p>
<p>This function can be used to accomplish the same things as Animate,
ScriptClip and all the other conditional filters in Avisynth. Note that to
modify per frame properties you should use <em>ModifyFrame</em>.</p>
<p>How to animate a BlankClip to fade from white to black. This is the simplest
use case without using the <em>prop_src</em> argument:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">vapoursynth</span> <span class="k">as</span> <span class="nn">vs</span>
<span class="kn">import</span> <span class="nn">functools</span>
<span class="n">base_clip</span> <span class="o">=</span> <span class="n">vs</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">BlankClip</span><span class="p">(</span><span class="nb">format</span><span class="o">=</span><span class="n">vs</span><span class="o">.</span><span class="n">YUV420P8</span><span class="p">,</span> <span class="n">length</span><span class="o">=</span><span class="mi">1000</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">128</span><span class="p">,</span> <span class="mi">128</span><span class="p">])</span>
<span class="k">def</span> <span class="nf">animator</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">clip</span><span class="p">):</span>
<span class="k">if</span> <span class="n">n</span> <span class="o">&gt;</span> <span class="mi">255</span><span class="p">:</span>
<span class="k">return</span> <span class="n">clip</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">vs</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">BlankClip</span><span class="p">(</span><span class="nb">format</span><span class="o">=</span><span class="n">vs</span><span class="o">.</span><span class="n">YUV420P8</span><span class="p">,</span> <span class="n">length</span><span class="o">=</span><span class="mi">1000</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="p">[</span><span class="n">n</span><span class="p">,</span> <span class="mi">128</span><span class="p">,</span> <span class="mi">128</span><span class="p">])</span>
<span class="n">animated_clip</span> <span class="o">=</span> <span class="n">vs</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">FrameEval</span><span class="p">(</span><span class="n">base_clip</span><span class="p">,</span> <span class="n">functools</span><span class="o">.</span><span class="n">partial</span><span class="p">(</span><span class="n">animator</span><span class="p">,</span> <span class="n">clip</span><span class="o">=</span><span class="n">base_clip</span><span class="p">))</span>
<span class="n">animated_clip</span><span class="o">.</span><span class="n">set_output</span><span class="p">()</span>
</pre></div>
</div>
<p>How to perform a simple per frame auto white balance. It shows how to access
calculated frame properties and use them for conditional filtering:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">vapoursynth</span> <span class="k">as</span> <span class="nn">vs</span>
<span class="kn">import</span> <span class="nn">functools</span>
<span class="kn">import</span> <span class="nn">math</span>
<span class="k">def</span> <span class="nf">GrayWorld1Adjust</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">f</span><span class="p">,</span> <span class="n">clip</span><span class="p">,</span> <span class="n">core</span><span class="p">):</span>
<span class="n">small_number</span> <span class="o">=</span> <span class="mf">0.000000001</span>
<span class="n">red</span> <span class="o">=</span> <span class="n">f</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">props</span><span class="p">[</span><span class="s1">&#39;PlaneStatsAverage&#39;</span><span class="p">]</span>
<span class="n">green</span> <span class="o">=</span> <span class="n">f</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">props</span><span class="p">[</span><span class="s1">&#39;PlaneStatsAverage&#39;</span><span class="p">]</span>
<span class="n">blue</span> <span class="o">=</span> <span class="n">f</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="o">.</span><span class="n">props</span><span class="p">[</span><span class="s1">&#39;PlaneStatsAverage&#39;</span><span class="p">]</span>
<span class="n">max_rgb</span> <span class="o">=</span> <span class="nb">max</span><span class="p">(</span><span class="n">red</span><span class="p">,</span> <span class="n">green</span><span class="p">,</span> <span class="n">blue</span><span class="p">)</span>
<span class="n">red_corr</span> <span class="o">=</span> <span class="n">max_rgb</span><span class="o">/</span><span class="nb">max</span><span class="p">(</span><span class="n">red</span><span class="p">,</span> <span class="n">small_number</span><span class="p">)</span>
<span class="n">green_corr</span> <span class="o">=</span> <span class="n">max_rgb</span><span class="o">/</span><span class="nb">max</span><span class="p">(</span><span class="n">green</span><span class="p">,</span> <span class="n">small_number</span><span class="p">)</span>
<span class="n">blue_corr</span> <span class="o">=</span> <span class="n">max_rgb</span><span class="o">/</span><span class="nb">max</span><span class="p">(</span><span class="n">blue</span><span class="p">,</span> <span class="n">small_number</span><span class="p">)</span>
<span class="n">norm</span> <span class="o">=</span> <span class="nb">max</span><span class="p">(</span><span class="n">blue</span><span class="p">,</span> <span class="n">math</span><span class="o">.</span><span class="n">sqrt</span><span class="p">(</span><span class="n">red_corr</span><span class="o">*</span><span class="n">red_corr</span> <span class="o">+</span> <span class="n">green_corr</span><span class="o">*</span><span class="n">green_corr</span> <span class="o">+</span> <span class="n">blue_corr</span><span class="o">*</span><span class="n">blue_corr</span><span class="p">)</span> <span class="o">/</span> <span class="n">math</span><span class="o">.</span><span class="n">sqrt</span><span class="p">(</span><span class="mi">3</span><span class="p">),</span> <span class="n">small_number</span><span class="p">)</span>
<span class="n">r_gain</span> <span class="o">=</span> <span class="n">red_corr</span><span class="o">/</span><span class="n">norm</span>
<span class="n">g_gain</span> <span class="o">=</span> <span class="n">green_corr</span><span class="o">/</span><span class="n">norm</span>
<span class="n">b_gain</span> <span class="o">=</span> <span class="n">blue_corr</span><span class="o">/</span><span class="n">norm</span>
<span class="k">return</span> <span class="n">core</span><span class="o">.</span><span class="n">std</span><span class="o">.</span><span class="n">Expr</span><span class="p">(</span><span class="n">clip</span><span class="p">,</span> <span class="n">expr</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;x &#39;</span> <span class="o">+</span> <span class="nb">repr</span><span class="p">(</span><span class="n">r_gain</span><span class="p">)</span> <span class="o">+</span> <span class="s1">&#39; *&#39;</span><span class="p">,</span> <span class="s1">&#39;x &#39;</span> <span class="o">+</span> <span class="nb">repr</span><span class="p">(</span><span class="n">g_gain</span><span class="p">)</span> <span class="o">+</span> <span class="s1">&#39; *&#39;</span><span class="p">,</span> <span class="s1">&#39;x &#39;</span> <span class="o">+</span> <span class="nb">repr</span><span class="p">(</span><span class="n">b_gain</span><span class="p">)</span> <span class="o">+</span> <span class="s1">&#39; *&#39;</span><span class="p">])</span>
<span class="k">def</span> <span class="nf">GrayWorld1</span><span class="p">(</span><span class="n">clip</span><span class="p">,</span> <span class="n">matrix_s</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="n">rgb_clip</span> <span class="o">=</span> <span class="n">vs</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">resize</span><span class="o">.</span><span class="n">Bilinear</span><span class="p">(</span><span class="n">clip</span><span class="p">,</span> <span class="nb">format</span><span class="o">=</span><span class="n">vs</span><span class="o">.</span><span class="n">RGB24</span><span class="p">)</span>
<span class="n">r_avg</span> <span class="o">=</span> <span class="n">vs</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">PlaneStats</span><span class="p">(</span><span class="n">rgb_clip</span><span class="p">,</span> <span class="n">plane</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<span class="n">g_avg</span> <span class="o">=</span> <span class="n">vs</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">PlaneStats</span><span class="p">(</span><span class="n">rgb_clip</span><span class="p">,</span> <span class="n">plane</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="n">b_avg</span> <span class="o">=</span> <span class="n">vs</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">PlaneStats</span><span class="p">(</span><span class="n">rgb_clip</span><span class="p">,</span> <span class="n">plane</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
<span class="n">adjusted_clip</span> <span class="o">=</span> <span class="n">vs</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">FrameEval</span><span class="p">(</span><span class="n">rgb_clip</span><span class="p">,</span> <span class="n">functools</span><span class="o">.</span><span class="n">partial</span><span class="p">(</span><span class="n">GrayWorld1Adjust</span><span class="p">,</span> <span class="n">clip</span><span class="o">=</span><span class="n">rgb_clip</span><span class="p">,</span> <span class="n">core</span><span class="o">=</span><span class="n">vs</span><span class="o">.</span><span class="n">core</span><span class="p">),</span> <span class="n">prop_src</span><span class="o">=</span><span class="p">[</span><span class="n">r_avg</span><span class="p">,</span> <span class="n">g_avg</span><span class="p">,</span> <span class="n">b_avg</span><span class="p">])</span>
<span class="k">return</span> <span class="n">vs</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">resize</span><span class="o">.</span><span class="n">Bilinear</span><span class="p">(</span><span class="n">adjusted_clip</span><span class="p">,</span> <span class="nb">format</span><span class="o">=</span><span class="n">clip</span><span class="o">.</span><span class="n">format</span><span class="o">.</span><span class="n">id</span><span class="p">,</span> <span class="n">matrix_s</span><span class="o">=</span><span class="n">matrix_s</span><span class="p">)</span>
<span class="n">vs</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">LoadPlugin</span><span class="p">(</span><span class="n">path</span><span class="o">=</span><span class="s1">&#39;BestSource.dll&#39;</span><span class="p">)</span>
<span class="n">main</span> <span class="o">=</span> <span class="n">vs</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">&#39;...&#39;</span><span class="p">)</span>
<span class="n">main</span> <span class="o">=</span> <span class="n">GrayWorld1</span><span class="p">(</span><span class="n">main</span><span class="p">)</span>
<span class="n">main</span><span class="o">.</span><span class="n">set_output</span><span class="p">()</span>
</pre></div>
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</dd></dl>
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