php+ffmpeg: convert high size smartphone videos with minimal quality loss

convert_all_videos_directory.php

<?php

// My smartphone Note 8 outputs really heavy size videos. So I wrote this script
// to automatically convert videos in given directory

$inputDir = 'directory_with_all_videos';
$outputDir = 'directory_to_save_converted_videos_to';

$files = glob($inputDir);

$count = count($files);
foreach ($files as $key => $file) {
	$done = $key + 1;
	$filebase = basename($file);
	$cmd = "C:\ffmpeg.exe -i " . __DIR__ . "/{$file} {outputDir}/{$filebase}";
	shell_exec($cmd);
	echo "Done {$done} / {$count}\n";
	exit;
}