FFMPEG command not running from php but working in cmd - php

Question

i have this function in my laravel controller
foreach ($arrayi['audio'] as $i => $audioFile) {
// Loop through the audio files and image files
// Create a new video with the audio file and image file
$dimensions = "1024x1024";
// Set the audio and image file paths
$audioPath = public_path("storage/{$arrayi['audio'][$i]}");
$imagePath = public_path("storage/{$arrayi['links'][$i]}");
$duration = exec("ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 {$audioPath}");
// Set the command to create the video
$command =exec("ffmpeg -loop 1 -i {$audioPath} -i {$imagePath} -t {$duration} -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p output_{$i}.mp4");
// Add the output video to the array of output videos
$outputVideos[] = public_path("storage/output_{$i}.mp4");
}
which is supposed to create multiple videos by running the ffmpeg command one by one for each image and audio. this is all done after clicking a button in browser.
I've tried printing the $command and then running it in cmd in windows and it all works fine but when i do it through the browser nothing happens. the $duration command works fine it passes the duration to the ffmpeg command .