Troubleshoot audio sync issues – Vimeo Help Center

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video following our <a href="https://help.vimeo.com/hc/en-us/articles/12426043233169" target="_blank" rel="noopener noreferrer">compression guidelines</a>.  However, if you continue to encounter issues, here are some common causes and fixes for the loss of audio sync. </p> <p>In this article:</p> <ul> <li><a href="#h_01FZGZ3TK1M9R9F7AT7H530NVN">Out-of-sync source files</a></li> <li><a href="#h_01FZGZ45G11MA48N6HPR1JHFA3">Variation between decoding technologies</a></li> <li><a href="#h_01FZGZ49E0BSYK51DCAZEHW1E1">Video encoded with variable frame rate</a></li> <li><a href="#h_01FZGZ4E2D3V5RT2G4BPA84TA5">Video contains multiple edit list entries</a></li> <li><a href="#h_01FZGZ4JCGRFHDTAJBRBY58C9B">Conversion process issues</a></li> </ul> <h3 id="h_01FZGZ3TK1M9R9F7AT7H530NVN">Out-of-sync source file</h3> <p>If the audio in your source file is out of sync, it will impact the uploaded video. Resolve any pre-existing audio sync issues in your editing software, then re-upload to Vimeo.</p> <h3 id="h_01FZGZ45G11MA48N6HPR1JHFA3">Variation between decoding technologies</h3> <p>There may be a slight variation between decoding technologies. Your video may look or sound different across different players and browsers <span style="font-weight: 400;">(which is out of Vimeo’s control).</span><span style="font-weight: 400;"> To minimize playback variations, make sure your browser is </span><span style="font-weight: 400;">up to date and close any additional programs running on your computer.</span></p> <h3 id="h_01FZGZ49E0BSYK51DCAZEHW1E1">Video encoded with a variable frame rate</h3> <p>We recommend that you use a <em>constant </em>frame rate rather than a variable frame rate. V<span style="font-weight: 400;">ariable frame rates are commonly used in webinars or screencasts. </span></p> <h3 id="h_01FZGZ4E2D3V5RT2G4BPA84TA5">The video contains multiple edit list entries</h3> <p>This impacts videos edited with QuickTime technology. Use the <strong>Export</strong> feature instead of <strong>Save</strong> or <strong>Save As </strong>when you are saving your video in QuickTime. </p> <h3 id="h_01FZGZ4JCGRFHDTAJBRBY58C9B">Conversion process issues</h3> <p><span style="font-weight: 400;">In rare cases, our conversion process will sometimes lead to variation between your source file and our playback versions. <br><br>To determine if that's the case, try this test:<br></span></p> <ol> <li><span style="font-weight: 400;">Go to your video page.</span></li> <li><span style="font-weight: 400;">Download both your source file and the largest HD Vimeo version of your video using the <strong>Download</strong> button on your video page.</span></li> <li>Play both versions of the video in the <strong>same</strong> program on your computer (e.g., Quicktime, Windows Media Player, or VLC) and make note of whether there's a difference between the two. If there are no differences, you may be experiencing a decoding issue in your browser. </li> </ol> <p class="p1">If you're not quite sure what's causing your sync issue, please <a href="http://vimeo.com/help/contact" target="_blank" rel="noopener noreferrer">contact us</a> so we can investigate further. 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Troubleshoot audio sync issues – Vimeo Help Center