Answers.Body: <p>The stack filters don't insert any padding. Your videos probably have empty space in them. You'll need the crop filter to remove the dead space.</p>
  
  <p>The stack filters require the video edge along the join axis to have the same dimensions i.e. height for hstack and width for vstack. So, don't crop those aspects.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-05-14T05:55:48.510Z
Answers.LastActivityDate: 2017-05-14T05:55:48.510Z
Answers.UserDisplayName: Gyan
Body: <p>The hstack feature works great, but it pads the videos. That is, it puts black space between them. I use a command like this:</p>
  
  <pre><code>ffmpeg -i 1.mp4 -i 2.mp4  -filter_complex "hstack" out.mp4
  </code></pre>
  
  <p>How do I remove the black space separating the component videos?</p>
  
  <p>Perhaps related, how do I control the size of the output video? If I could change the width of the output video, I imagine that would make the padding go away. But I couldn't find a way to combine the <code>scale=</code> parameter with hstack.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-05-10T04:56:32.130Z
Comments.Text: The stack filters don't insert any padding. Your videos probably have empty space in them. You'll need the crop filter. Show the full console output of your command.
Comments.UserDisplayName: Gyan
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-05-10T16:46:05.003Z
Comments.Text: Yes, you're right.  I missed that. Dumb of me. If you put your comment as an answer, I'll accept it. Thanks.
Comments.UserDisplayName: Bob Woodley
Tags: <ffmpeg>
Title: Stack videos with ffmpeg without padding
UserDisplayName: Bob Woodley
ThreadText: # Stack videos with ffmpeg without padding
  
  (Asked by: username_0 on 2017-05-10)
  
  The hstack feature works great, but it pads the videos. That is, it puts black space between them. I use a command like this:
  
  ```
  ffmpeg -i 1.mp4 -i 2.mp4  -filter_complex "hstack" out.mp4
  
  ```
  
  How do I remove the black space separating the component videos?
  
  Perhaps related, how do I control the size of the output video? If I could change the width of the output video, I imagine that would make the padding go away. But I couldn't find a way to combine the `scale=` parameter with hstack.
  
  **Tags:** ffmpeg
  
  > **Comments:**
  > **username_1**: The stack filters don't insert any padding. Your videos probably have empty space in them. You'll need the crop filter. Show the full console output of your command.  
  > **username_0**: Yes, you're right.  I missed that. Dumb of me. If you put your comment as an answer, I'll accept it. Thanks.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2017-05-14. Score: 2 | Accepted answer
  
  The stack filters don't insert any padding. Your videos probably have empty space in them. You'll need the crop filter to remove the dead space.
  
  The stack filters require the video edge along the join axis to have the same dimensions i.e. height for hstack and width for vstack. So, don't crop those aspects.
  
  
  ---
  
  