使用S3包装器和shell_exec（）PHP访问S3对象

I am using S3 as storage of content for my site. I am able to use S3 object with S3 wrapper to access them. But when I try to use with shell_exec(), it gives me error like...

s3://{my_bucket}/{object_key}: Protocol not found Did you mean file:s3://{my_bucket}/{object_key}?

FYI, I am using it create a thumb from video with ffmpeg command. I also confirmed with my server provider that he installed and configured aws-cli on my server.

What am I doing wrong or missing something in it? Let me know correct way to achieve this.

Here is my code...

$vidPath    = "s3://{my_bucket}/{vid_object_key}"; // where {vid_object_key} is path to source video

$thumbPath  = "s3://{my_bucket}/{thumb_object_key}"; // where {thumb_object_key} is path where thumb will be generated

$cmd        = "$ffmpeg -ss 1.0 -i ".$vidPath." -vframes 1 -t 1 ".$thumbPath." 2>&1";

$result     = shell_exec($cmd);