error

[liamxg]

(py38) lixingguangtekiMacBook-puro:blog_code-master lixingguang$ python scurve_animation.py
Traceback (most recent call last):
File "scurve_animation.py", line 227, in
ani.save('mymovie.mp4', writer=FFwriter,dpi=150)
File "/Users/lixingguang/opt/anaconda2/envs/py38/lib/python3.8/site-packages/matplotlib/animation.py", line 1132, in save
with writer.saving(self._fig, filename, dpi):
File "/Users/lixingguang/opt/anaconda2/envs/py38/lib/python3.8/contextlib.py", line 113, in enter
return next(self.gen)
File "/Users/lixingguang/opt/anaconda2/envs/py38/lib/python3.8/site-packages/matplotlib/animation.py", line 228, in saving
self.setup(fig, outfile, dpi, *args, **kwargs)
File "/Users/lixingguang/opt/anaconda2/envs/py38/lib/python3.8/site-packages/matplotlib/animation.py", line 352, in setup
self._run()
File "/Users/lixingguang/opt/anaconda2/envs/py38/lib/python3.8/site-packages/matplotlib/animation.py", line 362, in _run
self._proc = subprocess.Popen(
File "/Users/lixingguang/opt/anaconda2/envs/py38/lib/python3.8/subprocess.py", line 854, in init
self._execute_child(args, executable, preexec_fn, close_fds,
File "/Users/lixingguang/opt/anaconda2/envs/py38/lib/python3.8/subprocess.py", line 1702, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg'