Give it an array of addresses to image files, it turns them into a video and returns the address to that using FFMPEG

image_to_video.php

function pic2vid($picAddresses)
{
    $prefix = uniqid("app"); //A prefix for temp files
    foreach ($picAddresses as $key => $picAddress) {
        copy($picAddress, sys_get_temp_dir() . '/' . $prefix . sprintf('%03d', $key + 1) . '.png');
        if ($key == count($picAddresses) - 1)
            copy($picAddress, sys_get_temp_dir() . '/' . $prefix . sprintf('%03d', $key + 2) . '.png');
    }
    $filename = uniqid();
    shell_exec("/usr/local/bin/ffmpeg -framerate 0.5 -i " . sys_get_temp_dir() . '/' . $prefix . "%03d.png -c:v libx264 -vf fps=25 -pix_fmt yuv420p " . sys_get_temp_dir() . '/' . $filename . ".mp4 2>&1");
    return sys_get_temp_dir() . '/' . $filename . ".mp4";
}