Python：使用子进程调用ffmpeg命令行

Question

I'm trying to call simple ffmpeg command line with subprocess.call. (Example : ffmpeg -i input\\video.mp4 -r 30 input\\video.avi )

By typing directly the ffmpeg command it works, but when I try to call it with subprocess.call : subprocess.call('ffmpeg -i input\\video.mp4 -r 30 input\\video.avi', shell=True) there is no error, but it doesn't produce anything.

Any idea where can be the problem? (I'm working with python 3.4 or 2.7, I tried both)

Answer 1

Finally found the problem : when you are using subprocess you MUST use

/

for your files location instead of

\

EDIT : or you can use raw-string literals -> r'ffmpeg -i input\\video.mp4 ...' (notice: r'') or you can double them ' \\\\ ' Thanks to JF Sebastian

Answer 2

x=subprocess.Popen('ffmpeg -i input\video.mp4 -r 30 input\video.avi', shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
output,err=x.communicate()
if output:
      print "success ",output
else:
      print "error ",err

You can try this and check output and errors if any.