Difference between use subprocess.Popen() and run the command in shell mannually?

Question

import subprocess
ffmpeg_params=[\'ffmpeg\', \'-y\', \'-i\', \'http://cache.m.iqiyi.com/mus/235133201/2af150aebb98276a80d52513fb91fbc8/afbe8fd3d73448c9/0/20210115/1f/c5/