title: How to join two video files using Python?
body: <p>Here I tried to cut first and second 30sec long video file from "path/connect.webm" to the strings out and out1. It works. But what I need to do is to concatenate these two strings and write that to a file "path/final.webm". So that I get a 60sec long video file "final.webm" at the end. But now i get first 30sec long video only as the output. Please help me. Thanks a lot in advance.</p>
  
  <p>Code in python:</p>
  
  <pre><code>import subprocess,os
  
  fname = "/home/xincoz/test/final.webm"
  
  fp = open(fname,'wb')
  
  ffmpeg_command = ["ffmpeg", "-i", "/home/xincoz/test/connect.webm", "-acodec", "copy",   "-ss", "00:00:00", "-t", "00:00:30","-f", "webm", "pipe:1"]
  
  p = subprocess.Popen(ffmpeg_command,stdout=subprocess.PIPE)
  
  out, err = p.communicate()
  
  ffmpeg_command1 = ["ffmpeg", "-i", "/home/xincoz/test/connect.webm", "-acodec", "copy",   "-ss", "00:00:31", "-t", "00:00:30","-f", "webm", "pipe:1"]
  
  p1 = subprocess.Popen(ffmpeg_command1,stdout=subprocess.PIPE)
  
  out1, err1 = p1.communicate()
  
  string = out + out1
  
  print len(out)
  
  print len(out1)
  
  print len(string)
  
  fp.write(string)
  
  fp.close()
  </code></pre>
  
  <p>Please help me.</p>