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hardware encoder detected”</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#jobs-stuck-in-queued-state" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Jobs stuck in “queued” state</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#high-cpu-usage-during-encoding" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">High CPU usage during encoding</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#database-locked-errors" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Database locked errors</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#files-being-skipped-unexpectedly" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Files being skipped unexpectedly</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#vmaf-scores-not-appearing" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">VMAF scores not appearing</span> </a> </li> </ul> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#log-locations" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Log Locations</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#getting-more-help" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Getting More Help</span> </a> </li> </ul> </div></details></nav></mobile-starlight-toc></div><div class="right-sidebar-panel sl-hidden lg:sl-block astro-pb3aqygn"><div class="sl-container astro-pb3aqygn"><starlight-toc data-min-h="2" data-max-h="3"><nav aria-labelledby="starlight__on-this-page"><h2 id="starlight__on-this-page">On this page</h2><ul class="astro-g2bywc46" style="--depth: 0;"> <li class="astro-g2bywc46" style="--depth: 0;"> <a href="#_top" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Overview</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#common-issues" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Common Issues</span> </a> <ul class="astro-g2bywc46" style="--depth: 1;"> <li class="astro-g2bywc46" style="--depth: 1;"> <a href="#failed-to-load-settings--401-unauthorized" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">”Failed to load settings” / 401 Unauthorized</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#no-hardware-encoder-detected" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">“No hardware encoder detected”</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#jobs-stuck-in-queued-state" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Jobs stuck in “queued” state</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#high-cpu-usage-during-encoding" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">High CPU usage during encoding</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#database-locked-errors" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Database locked errors</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#files-being-skipped-unexpectedly" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Files being skipped unexpectedly</span> </a> </li><li class="astro-g2bywc46" style="--depth: 1;"> <a href="#vmaf-scores-not-appearing" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">VMAF scores not appearing</span> </a> </li> </ul> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#log-locations" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Log Locations</span> </a> </li><li class="astro-g2bywc46" style="--depth: 0;"> <a href="#getting-more-help" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Getting More Help</span> </a> </li> </ul> </nav></starlight-toc></div></div> </div> </aside> <div class="main-pane astro-67yu43on"> <main data-pagefind-body lang="en" dir="ltr" class="astro-bguv2lll"> <div class="content-panel astro-7nkwcw3z"> <div class="sl-container astro-7nkwcw3z"> <h1 id="_top" class="astro-j6tvhyss">Troubleshooting</h1> </div> </div> <div class="content-panel astro-7nkwcw3z"> <div class="sl-container astro-7nkwcw3z"> <div class="sl-markdown-content"> <p>This page provides answers to the most common problems users face when using Alchemist.</p>
<h2 id="common-issues">Common Issues</h2>
<h3 id="failed-to-load-settings--401-unauthorized">”Failed to load settings” / 401 Unauthorized</h3>
<p><strong>Cause</strong>: Your session has expired, or the authentication token is no longer being sent correctly.</p>
<p><strong>Solution</strong>: Clear your browsers local storage and re-login:</p>
<div class="expressive-code"><link rel="stylesheet" href="/alchemist-docs/_astro/ec.usa2f.css"/><script type="module" src="/alchemist-docs/_astro/ec.sgewm.js"></script><figure class="frame not-content"><figcaption class="header"></figcaption><pre tabindex="0" dir="ltr"><code><div class="ec-line"><span style="--0:#7FDBCA;--1:#096E72">localStorage</span><span style="--0:#C792EA;--1:#8844AE">.</span><span style="--0:#82AAFF;--1:#3B61B0">removeItem</span><span style="--0:#D6DEEB;--1:#403F53">(</span><span style="--0:#D9F5DD;--1:#111111">&#39;</span><span style="--0:#ECC48D;--1:#984E4D">alchemist_token</span><span style="--0:#D9F5DD;--1:#111111">&#39;</span><span style="--0:#D6DEEB;--1:#403F53">);</span></div><div class="ec-line"><span style="--0:#7FDBCA;--1:#096E72">window</span><span style="--0:#C792EA;--1:#8844AE">.</span><span style="--0:#FAF39F;--1:#111111">location</span><span style="--0:#C792EA;--1:#8844AE">.</span><span style="--0:#7FDBCA;--1:#096E72">href</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#C792EA;--1:#8844AE">=</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#D9F5DD;--1:#111111">&#39;</span><span style="--0:#ECC48D;--1:#984E4D">/login</span><span style="--0:#D9F5DD;--1:#111111">&#39;</span><span style="--0:#D6DEEB;--1:#403F53">;</span></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="localStorage.removeItem('alchemist_token');window.location.href = '/login';"><div></div></button></div></figure></div>
<h3 id="no-hardware-encoder-detected">“No hardware encoder detected”</h3>
<p><strong>Cause</strong>: The necessary GPU drivers are missing, or the container is not configured to see your graphics card.</p>
<p><strong>Solution</strong>:</p>
<ol>
<li><strong>Check FFmpeg</strong>: Run <code dir="auto">ffmpeg -encoders | grep -E &quot;nvenc|qsv|vaapi&quot;</code> inside your container to see if hardware support is enabled.</li>
<li><strong>Verify Drivers</strong>: For NVIDIA, ensure the <strong>NVIDIA Container Toolkit</strong> is installed on your host.</li>
<li><strong>Check Permissions</strong>: On Linux, ensure the user has access to <code dir="auto">/dev/dri</code> (usually by adding them to the <code dir="auto">render</code> or <code dir="auto">video</code> groups).</li>
</ol>
<h3 id="jobs-stuck-in-queued-state">Jobs stuck in “queued” state</h3>
<p><strong>Cause</strong>: The engine might be paused, or there are no available slots in the scheduler.</p>
<p><strong>Solution</strong>:</p>
<ol>
<li><strong>Check Status</strong>: Go to the <strong>Dashboard</strong> and look for a “Resume” button.</li>
<li><strong>Check Logs</strong>: Visit the <code dir="auto">/logs</code> page to see if any errors are being reported by the scheduler.</li>
</ol>
<h3 id="high-cpu-usage-during-encoding">High CPU usage during encoding</h3>
<p><strong>Cause</strong>: Alchemist is falling back to your CPU (Software Encoding) instead of using your graphics card.</p>
<p><strong>Solution</strong>:</p>
<ol>
<li><strong>Verify Hardware</strong>: Check the <strong>Hardware Settings</strong> to ensure your GPU is selected.</li>
<li><strong>Reduce Jobs</strong>: Lower the <code dir="auto">concurrent_jobs</code> setting (try setting it to <code dir="auto">1</code>).</li>
<li><strong>Use Speed Profile</strong>: Switch to the “Speed” quality profile in <strong>Settings</strong>.</li>
</ol>
<h3 id="database-locked-errors">Database locked errors</h3>
<p><strong>Cause</strong>: Multiple processes are trying to write to the SQLite database at the same time.</p>
<p><strong>Solution</strong>:</p>
<ol>
<li><strong>Single Instance</strong>: Ensure you arent running more than one Alchemist container at once.</li>
<li><strong>Zombie Processes</strong>: If you arent using Docker, check for any old Alchemist processes running in the background.</li>
<li><strong>Check Locks</strong>: If it persists, you may need to manually delete the lock file in your <code dir="auto">data/</code> folder.</li>
</ol>
<h3 id="files-being-skipped-unexpectedly">Files being skipped unexpectedly</h3>
<p><strong>Cause</strong>: The Alchemist analysis has determined that a transcode wouldnt actually save any space or would ruin the quality.</p>
<p><strong>Solution</strong>:</p>
<ol>
<li><strong>Check the Logs</strong>: Look at the “Decision Log” in <code dir="auto">/logs</code> to see the reason for skipping.</li>
<li><strong>Adjust Thresholds</strong>: You might have a high <code dir="auto">min_file_size_mb</code> or a strict <code dir="auto">size_reduction_threshold</code>. Adjust these in <strong>Settings</strong>.</li>
</ol>
<h3 id="vmaf-scores-not-appearing">VMAF scores not appearing</h3>
<p><strong>Cause</strong>: The version of FFmpeg you are using might not have <code dir="auto">libvmaf</code> support.</p>
<p><strong>Solution</strong>:</p>
<ol>
<li><strong>Check FFmpeg Filters</strong>: Run <code dir="auto">ffmpeg -filters | grep vmaf</code>.</li>
<li><strong>VMAF is Optional</strong>: Dont worry, transcoding will still work perfectly even without quality scoring.</li>
</ol>
<h2 id="log-locations">Log Locations</h2>
<p>If youre still stuck, checking the logs is the best way to find out whats going wrong.</p>
<table><thead><tr><th style="text-align:left">Environment</th><th style="text-align:left">Command to View Logs</th></tr></thead><tbody><tr><td style="text-align:left"><strong>Docker</strong></td><td style="text-align:left"><code dir="auto">docker logs -f alchemist</code></td></tr><tr><td style="text-align:left"><strong>Binary</strong></td><td style="text-align:left">View standard output (or redirect to a file)</td></tr><tr><td style="text-align:left"><strong>Systemd</strong></td><td style="text-align:left"><code dir="auto">journalctl -u alchemist -f</code></td></tr></tbody></table>
<h2 id="getting-more-help">Getting More Help</h2>
<p>If your issue isnt listed here, you can:</p>
<ul>
<li><strong>Check GitHub Issues</strong>: <a href="https://github.com/bybrooklyn/alchemist/issues">Browse existing reports or create a new one</a>.</li>
<li><strong>Review the Live Logs</strong>: Use the <code dir="auto">/logs</code> page in the Alchemist web interface for real-time diagnostics.</li>
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