Extract a thumbnail using PHP and FFmpeg

test_extract_thumbnail.php

<?php

class Extract {
    const FFMPEG_PATH = '/usr/bin/ffmpeg';

    public function exec($psSource, $psDest) {
        $aOutput = [];
        $aError = null;
        $sCommand = sprintf("%s -i %s -vframes 1 %s 2>&1", self::FFMPEG_PATH, $psSource, $psDest);
        echo 'Executing: ' . $sCommand;
        exec($sCommand, $aOutput, $aError);
        print_r('Output: ' . implode("\n", $aOutput));
        print_r($aError);
        if (!file_exists($psDest) || filesize($psDest) == 0) {
            echo 'Video export format generation failed!';
        }
    }
}

$oExtract = new Extract();
$oExtract->exec('./test.mp4', './out.jpg');