最典型的模块
一,执行cmd并读取返回值
import subprocess
p = subprocess.Popen("ls",
stdout=subprocess.PIPE, universal_newlines=True)
p.wait()
result_lines = p.stdout.readlines()
for line in result_lines:
print(line)
二,执行cmd命令
import subprocess
cmd = "ffmpeg -i bb_short.mp4 -vf \"select=\'eq(pict_type, PICT_TYPE_I)\'\" -vsync vfr out%d.png"
p = subprocess.Popen(cmd, shell=True)
p.wait()