FFmpeg converts a 11mb file - 20 - 40 seconds. Why so long?

Question

PHP

The input is flv file with a resolution of 720x640.

public function direct($flv, $thumbnail, $resolution = '400x300') {
$command = "ffmpeg -i $flv -ab 32 -ar 22050 -b 700 -r 15 -s ".
"$resolution -y -f flv $thumbnail";
return shell_exec($command);
}

Knowing people, look at the code, I didn’t mess up with the bitrate?

Answer 1

maybe I'll open your eyes, but video compression is a resource-intensive process.

Answer 2

what system config? :)