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→HDMI IN test method
<li><p>The OPi OS Arch system HDMI in function is closed by default, and the opening method is shown below：</p>
<ol style="list-style-type: lower-alpha;">
<li><p>First add the following configuration in > '''/boot/extlinux/extlinux.conf'''</p>
{| class="wikitable" style="width:800px;"
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<li><p>Then find '''Qt V4L2 test Utility''' and open it</p>
<p>[[File:media/image526.png|367x205px]]</p></li>
<li><p>Then make sure '''Qt V4L2 test Utility''' recognizes the HDMI In > device</p>
<p>[[File:media/image527.png|508x185px]]</p></li>
<li><p>Then click the location shown in the figure below to see the > video entered by HDMI In</p>
<p>[[File:media/image528.png|508x359px]]</p></li>
<li><p>The video window entered by HDMI In is shown below：</p>