title: how to resolve error FileNotFoundError: [WinError 2] The system cannot find the file specified when using ffmpeg-python?
body: <p>I'm trying to merge video and audio files together using ffmprg but I keep on receiving this error</p>
  <p><strong>ERROR:</strong></p>
  <pre><code>Traceback (most recent call last):
    File &quot;C:\Users\Geo\youtubedownloader\test.py&quot;, line 9, in &lt;module&gt;
      ffmpeg.concat(video,audio, v=1 , a=1).output(&quot;C:/Users/Geo/output_video/mergedretweett.mp4/&quot;).run()
    File &quot;C:\Users\Geo\AppData\Local\Programs\Python\Python39\lib\site-packages\ffmpeg\_run.py&quot;, line 313, in run
      process = run_async(
    File &quot;C:\Users\Geo\AppData\Local\Programs\Python\Python39\lib\site-packages\ffmpeg\_run.py&quot;, line 284, in run_async
      return subprocess.Popen(
    File &quot;C:\Users\Geo\AppData\Local\Programs\Python\Python39\lib\subprocess.py&quot;, line 947, in __init__
      self._execute_child(args, executable, preexec_fn, close_fds,
    File &quot;C:\Users\Geo\AppData\Local\Programs\Python\Python39\lib\subprocess.py&quot;, line 1416, in _execute_child
      hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
  FileNotFoundError: [WinError 2] The system cannot find the file specified
  </code></pre>
  <p><strong>Code:</strong></p>
  <pre><code>
  
  video = ffmpeg.input(&quot;C:/Users/Geo/File.mp4&quot;)
  
  audio = ffmpeg.input(&quot;C:/Users/Geo/File_audio.mp4&quot;)
  
  
  ffmpeg.concat(video,audio, v=1 , a=1).output(&quot;C:/Users/Geo/output_video/outputvideo.mp4&quot;).run()```
  
  
  </code></pre>