mirror of
https://github.com/vondas-network/videobeaux.git
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cskonopka
165 lines
7.4 KiB
HTML
165 lines
7.4 KiB
HTML
<!DOCTYPE html>
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<html lang="en-US">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<!-- Begin Jekyll SEO tag v2.8.0 -->
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<title>speed</title>
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<meta name="generator" content="Jekyll v3.10.0" />
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<meta property="og:title" content="speed" />
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<meta property="og:locale" content="en_US" />
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<meta name="description" content="The friendly multilateral video toolkit built for artists by artists." />
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<meta property="og:description" content="The friendly multilateral video toolkit built for artists by artists." />
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<link rel="canonical" href="http://localhost:4000/videobeaux/programs/effects/speed.html" />
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<meta property="og:url" content="http://localhost:4000/videobeaux/programs/effects/speed.html" />
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<meta property="og:type" content="website" />
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<meta name="twitter:card" content="summary" />
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<meta property="twitter:title" content="speed" />
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<script type="application/ld+json">
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{"@context":"https://schema.org","@type":"WebPage","description":"The friendly multilateral video toolkit built for artists by artists.","headline":"speed","publisher":{"@type":"Organization","logo":{"@type":"ImageObject","url":"http://localhost:4000/videobeaux/assets/img/videobeaux.png"}},"url":"http://localhost:4000/videobeaux/programs/effects/speed.html"}</script>
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<!-- End Jekyll SEO tag -->
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<link rel="stylesheet" href="/videobeaux/assets/css/style.css?v=5e23701ed3967d38bab12937d79f95fae74b2a53">
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<!--[if lt IE 9]>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.min.js"></script>
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<![endif]-->
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<!-- start custom head snippets, customize with your own _includes/head-custom.html file -->
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<!-- Setup Google Analytics -->
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<!-- You can set your favicon here -->
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<!-- link rel="shortcut icon" type="image/x-icon" href="/videobeaux/favicon.ico" -->
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<!-- end custom head snippets -->
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</head>
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<body>
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<div class="wrapper">
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<header>
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<h1><a href="http://localhost:4000/videobeaux/">videobeaux</a></h1>
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<img src="/videobeaux/assets/img/videobeaux.png" alt="Logo" />
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<p>The friendly multilateral video toolkit built for artists by artists.</p>
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<p class="view"><a href="https://github.com/schwwaaa/videobeaux">View the Project on GitHub <small>schwwaaa/videobeaux</small></a></p>
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</header>
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<section>
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<h1 id="speed">speed</h1>
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<h2 id="description">Description</h2>
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<p>Changes the playback speed of the input video and audio simultaneously.<br />
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This module is useful for slow motion, fast motion, timelapse, rhythmic edits, and any effect requiring temporal compression or expansion.</p>
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<h2 id="purpose">Purpose</h2>
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<p><code class="language-plaintext highlighter-rouge">speed</code> is designed for creators who want to:</p>
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<ul>
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<li>increase or decrease playback speed uniformly,</li>
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<li>generate slow-motion or fast-motion stylization,</li>
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<li>build rhythmic visual edits synced to music,</li>
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<li>create timelapse effects without external tools,</li>
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<li>maintain audio pitch relationship unless later reprocessed.</li>
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</ul>
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<h2 id="how-it-works">How It Works</h2>
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<ol>
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<li><strong>Timebase Adjustment</strong><br />
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Video frames are retimed according to the provided speed factor.</li>
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<li><strong>Audio Resampling</strong><br />
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Audio is also sped up or slowed down to match the new video duration.</li>
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<li><strong>Encoding</strong><br />
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The resulting retimed clip is encoded using global Videobeaux settings (codec, CRF, pixel format).</li>
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</ol>
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<h3 id="notes">Notes</h3>
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<ul>
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<li>Speed values <strong>greater than 1.0</strong> = faster playback.</li>
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<li>Speed values <strong>less than 1.0</strong> = slower playback.</li>
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</ul>
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<h2 id="program-template">Program Template</h2>
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<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>videobeaux <span class="nt">-P</span> speed <span class="se">\</span>
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<span class="nt">-i</span> input.mp4 <span class="se">\</span>
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<span class="nt">-o</span> output.mp4 <span class="se">\</span>
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<span class="nt">--speed_factor</span> VALUE
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</code></pre></div></div>
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<h2 id="arguments">Arguments</h2>
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<ul>
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<li><strong>speed_factor</strong> — Multiplier for playback speed.
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<ul>
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<li><code class="language-plaintext highlighter-rouge">0.5</code> → half-speed (slow motion)</li>
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<li><code class="language-plaintext highlighter-rouge">2.0</code> → double-speed (fast motion)</li>
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<li><code class="language-plaintext highlighter-rouge">0.25</code> → quarter-speed</li>
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<li><code class="language-plaintext highlighter-rouge">4.0</code> → 4× speed</li>
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</ul>
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</li>
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</ul>
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<h2 id="real-world-example">Real World Example</h2>
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<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>videobeaux <span class="nt">-P</span> speed <span class="se">\</span>
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<span class="nt">-i</span> myvideo.mp4 <span class="se">\</span>
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<span class="nt">-o</span> speed_styled.mp4 <span class="se">\</span>
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<span class="nt">--speed_factor</span> EXAMPLE
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</code></pre></div></div>
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<h2 id="program-output">Program Output</h2>
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<video controls="" preload="metadata" style="max-width:100%; border-radius:8px; margin:1em 0;">
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<source src="https://github.com/schwwaaa/videobeaux/assets/7625379/c27efdb1-ae81-4d8d-a153-de6294b7fedf" type="video/mp4" />
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Your browser does not support the video tag.
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</video>
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<h2 id="technical-notes">Technical Notes</h2>
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<ul>
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<li>Audio pitch will shift unless processed later with an external pitch-correction tool.</li>
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<li>High speed factors may expose motion judder depending on frame rate.</li>
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<li>Very slow speeds may require additional interpolation if smooth motion is desired (use <code class="language-plaintext highlighter-rouge">frame_interpolate</code> first).</li>
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<li>Retime operations do not introduce new frames; they only alter timing unless combined with interpolation.</li>
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</ul>
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<h2 id="recommended-usage">Recommended Usage</h2>
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<ul>
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<li>Music video edits synced to rhythmic patterns.</li>
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<li>Timelapse creation.</li>
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<li>Slow-motion mood sequences.</li>
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<li>Fast-motion montage, humor, or surreal pacing.</li>
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<li>Preprocessing before LUTs or effects when timing matters.</li>
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</ul>
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<h2 id="quality-tips">Quality Tips</h2>
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<ul>
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<li>For the cleanest slow motion, run <code class="language-plaintext highlighter-rouge">frame_interpolate</code> before <code class="language-plaintext highlighter-rouge">speed</code> to create missing frames.</li>
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<li>Use lower CRF for crisp motion edges when speeding up footage.</li>
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<li>Use higher CRF for intentionally grittier motion artifacts.</li>
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<li>Pair with <code class="language-plaintext highlighter-rouge">looper_pro</code> for smooth motion loops.</li>
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<li>Combine with <code class="language-plaintext highlighter-rouge">nostalgic_stutter</code> or <code class="language-plaintext highlighter-rouge">bad_animation</code> for stylized cadence distortion.</li>
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</ul>
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</section>
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<footer>
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<p>This project is maintained by <a href="https://github.com/schwwaaa">schwwaaa</a></p>
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<p><small>Hosted on GitHub Pages — Theme by <a href="https://github.com/orderedlist">orderedlist</a></small></p>
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</footer>
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</div>
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<script src="/videobeaux/assets/js/scale.fix.js"></script>
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</body>
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</html>
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