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<li class="toctree-l4"><a class="reference internal" href="#std.ModifyFrame"><code class="docutils literal notranslate"><span class="pre">ModifyFrame()</span></code></a></li>
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<section id="modifyframe">
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<h1>ModifyFrame<a class="headerlink" href="#modifyframe" 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.ModifyFrame">
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<span class="sig-prename descclassname"><span class="pre">std.</span></span><span class="sig-name descname"><span class="pre">ModifyFrame</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">clip[]</span> <span class="pre">clips</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">func</span> <span class="pre">selector</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#std.ModifyFrame" title="Permalink to this definition"></a></dt>
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<dd><p>The <em>selector</em> function is called for every single frame and can modify the
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properties of one of the frames gotten from <em>clips</em>. The additional <em>clips</em>’
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properties should only be read and not modified because only one modified
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frame can be returned.</p>
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<p>You must first copy the input frame to make it modifiable. Any frame may be
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returned as long as it has the same format as the <em>clip</em>.
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Failure to do so will produce an error. If for conditional reasons you do not
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need to modify the current frame’s properties, you can simply pass it through.
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The selector function is passed <em>n</em>, the current frame number, and <em>f</em>, which
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is a frame or a list of frames if there is more than one clip specified.</p>
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<p>If you do not need to modify frame properties but only read them, you should
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probably be using <em>FrameEval</em> instead.</p>
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<p>How to set the property FrameNumber to the current frame number:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">set_frame_number</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">f</span><span class="p">):</span>
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<span class="n">fout</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
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<span class="n">fout</span><span class="o">.</span><span class="n">props</span><span class="p">[</span><span class="s1">'FrameNumber'</span><span class="p">]</span> <span class="o">=</span> <span class="n">n</span>
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<span class="k">return</span> <span class="n">fout</span>
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<span class="o">...</span>
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<span class="n">ModifyFrame</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">clips</span><span class="o">=</span><span class="n">clip</span><span class="p">,</span> <span class="n">selector</span><span class="o">=</span><span class="n">set_frame_number</span><span class="p">)</span>
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</pre></div>
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</div>
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<p>How to remove a property:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">remove_property</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">f</span><span class="p">):</span>
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<span class="n">fout</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
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<span class="k">del</span> <span class="n">fout</span><span class="o">.</span><span class="n">props</span><span class="p">[</span><span class="s1">'FrameNumber'</span><span class="p">]</span>
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<span class="k">return</span> <span class="n">fout</span>
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<span class="o">...</span>
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<span class="n">ModifyFrame</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">clips</span><span class="o">=</span><span class="n">clip</span><span class="p">,</span> <span class="n">selector</span><span class="o">=</span><span class="n">remove_property</span><span class="p">)</span>
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</pre></div>
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</div>
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<p>An example of how to copy certain properties from one clip to another
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(clip1 and clip2 have the same format):</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">transfer_property</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">f</span><span class="p">):</span>
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<span class="n">fout</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">copy</span><span class="p">()</span>
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<span class="n">fout</span><span class="o">.</span><span class="n">props</span><span class="p">[</span><span class="s1">'FrameNumber'</span><span class="p">]</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">'FrameNumber'</span><span class="p">]</span>
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<span class="n">fout</span><span class="o">.</span><span class="n">props</span><span class="p">[</span><span class="s1">'_Combed'</span><span class="p">]</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">'_Combed'</span><span class="p">]</span>
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<span class="k">return</span> <span class="n">fout</span>
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<span class="o">...</span>
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<span class="n">ModifyFrame</span><span class="p">(</span><span class="n">clip</span><span class="o">=</span><span class="n">clip1</span><span class="p">,</span> <span class="n">clips</span><span class="o">=</span><span class="p">[</span><span class="n">clip1</span><span class="p">,</span> <span class="n">clip2</span><span class="p">],</span> <span class="n">selector</span><span class="o">=</span><span class="n">transfer_property</span><span class="p">)</span>
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</pre></div>
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</div>
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</dd></dl>
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