Answers.Body: <p>Use</p>
  
  <pre><code>ffmpeg -i file1.avi -i file2.avi -filter_complex "[0][1]vstack" -t 10 joined.avi
  </code></pre>
  
  <p>This will stack the videos vertically and play the first 10 seconds of each. Remove the <code>-t</code> option if the videos are longer and you wish to extend the output. This command also uses the default parameters to encode the video i.e. codec will be MPEG4 Part 2 (Xvid..). If there's any audio, the track from the first video will be used and encoded as MP3.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-05-12T19:13:07.383Z
Answers.LastActivityDate: 2016-05-12T19:13:07.383Z
Answers.UserDisplayName: Gyan
Body: <p>Let's say that I have a <code>file1.avi</code> and a <code>file2.avi</code>. Each one of these files is the same size, for instance 300x100.</p>
  
  <p>How could I join them, so that both of them would play the first 10 seconds of each video at the same time, one on top of the other, in a 300x200 video?</p>
  
Tags: <ffmpeg>
Title: Join 2 videos to play at the same time
UserDisplayName: Enrique Moreno Tent
ThreadText: # Join 2 videos to play at the same time
  
  (Asked by: username_0 on 2016-05-12)
  
  Let's say that I have a `file1.avi` and a `file2.avi`. Each one of these files is the same size, for instance 300x100.
  
  How could I join them, so that both of them would play the first 10 seconds of each video at the same time, one on top of the other, in a 300x200 video?
  
  **Tags:** ffmpeg
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2016-05-12. Score: 4 | Accepted answer
  
  Use
  
  ```
  ffmpeg -i file1.avi -i file2.avi -filter_complex "[0][1]vstack" -t 10 joined.avi
  
  ```
  
  This will stack the videos vertically and play the first 10 seconds of each. Remove the `-t` option if the videos are longer and you wish to extend the output. This command also uses the default parameters to encode the video i.e. codec will be MPEG4 Part 2 (Xvid..). If there's any audio, the track from the first video will be used and encoded as MP3.
  
  
  ---
  
  