Create a Video Thumbnail from MP4 with FFMPEG

VideoUtilities.php

<?php

use Storage;

$file = 'route/to/file.mp4';
$dirThumbnails = 'folder/for/thumbnails';

$thumbnailGroupQuantity = 60;
$thumbnailLineQuantity = 6;
$secondsBetweenTwoThumbnails = 5;
$size = 128;

$responseForFFMPEG = invoke_shell('ffmpeg -version');
if (0 === $responseForFFMPEG->status) {
    // Storage in own server, in public/medias folder
    $storage = Storage::disk('medias');

    // Command to retrieve all frames/$secondsBetweenTwoThumbnails seconds from a video
    $response = invoke_shell(
        'ffmpeg -i ' . $file .
        ' -vf "fps=1/' . $secondsBetweenTwoThumbnails . ',' .
        ' scale=-2:' . $size . '" ' .
        '-start_number 0 ' . $dirThumbnails . '/%10d.jpg'
    );
    
    if (0 === $response->status) {
        $files = glob($dirThumbnails . '/*');
        
        // Put images in group of $thumbnailGroupQuantity images, and create a json with coordinates
        for ($groupIndex = 0; $groupIndex < ceil(count($files) / $thumbnailGroupQuantity); ++$groupIndex) {
            $groupPath = array_slice(
                $files,
                $groupIndex * $thumbnailGroupQuantity,
                $thumbnailGroupQuantity
            );
            
            $coordinates = [];
            $jpg = null;
            // Place images on line of thumbnailLineQuantity items
            for ($lineIndex = 0; $lineIndex < ceil(count($groupPath) / $thumbnailLineQuantity); ++$lineIndex) {
                $linePath = array_slice(
                    $groupPath,
                    $lineIndex * $thumbnailLineQuantity,
                    $thumbnailLineQuantity
                );
                
                foreach ($linePath as $pathIndex => $path) {
                    $imageInfos = getimagesize($path);
                    [$imageWidth, $imageHeight] = $imageInfos;

                    $coordinatesX = $imageWidth * $pathIndex;
                    $coordinatesY = $imageHeight * $lineIndex;

                    if (!is_resource($jpg)) {
                        $jpg = imagecreatetruecolor(
                            $imageWidth * count($linePath),
                            $imageHeight * ceil(count($groupPath) / $thumbnailLineQuantity)
                        );
                    }

                    $imgSrc = imagecreatefromjpeg($path);
                    imagecopyresized(
                        $jpg,
                        $imgSrc,
                        $coordinatesX,
                        $coordinatesY,
                        0,
                        0,
                        $imageWidth,
                        $imageHeight,
                        $imageWidth,
                        $imageHeight
                    );

                    // Add coordinates in array for .json
                    $coordinates[] = [
                        'x' => $coordinatesX,
                        'y' => $coordinatesY,
                        'width' => $imageWidth,
                        'height' => $imageHeight
                    ];
                }
            }
            
            imagejpeg($jpg, $dirThumbnails . '/sprite-' . $groupIndex . '.jpg');
            $storage->put(
                $dirThumbnails .'/sprite-' . $groupIndex . '.json',
                try_json_encode($coordinates)
            );

            if (isset($jpg) && is_resource($jpg)) {
                imagedestroy($jpg);
                $jpg = null;
            }

            // Clean useless .jpg
            array_map('unlink', $files);
        }
    }
}