Answers.Body: <p>This needs a slightly elaborate filtergraph to do as described.</p>
  
  <pre><code>-filter_complex
      "[0]split[b1][b2];
       [b1]crop=iw/2:ih:0:0[b1];
       [b2]crop=iw/2:ih:iw/2:0[b2];
       [1][b1]overlay=x='0-(W/2)*(t-DUR0)/D':enable=gte(t,DUR0)[ob1];
       [ob1][b2]overlay=x='W/2+(W/2)*(t-DUR0)/D':enable=gte(t,DUR0)[fv]
      "
  </code></pre>
  
  <p>where <code>0</code> is video '1' and <code>1</code> is video '2'. <code>DUR0</code> should be replaced with duration of video '1' and <code>D</code> with duration of the effect.  </p>
  
  <hr>
  
  <p>A curtain effect, like what Paul described, can be done like this:</p>
  
  <pre><code>blend=all_expr='if(lte((W/2-abs(X-SW*W/2))/(SW*W/2),(T-S)/D),B,A)'
  </code></pre>
  
  <p>where <code>S</code> is start time in seconds. (You may want/need to adjust the timestamps of the top video 'A' beforehand using <code>setpts</code>) and <code>D</code> is duration of effect. These two variables should be replaced with the required numeral values.</p>
  
  <p>I can't test either of these for a few days.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-09-23T06:18:20.307Z
Answers.LastActivityDate: 2017-09-23T06:18:20.307Z
Answers.UserDisplayName: Gyan
Body: <p>I have bee experimenting with ffmpeg on video transitions , Now am stuck in this transition , I have no where to go ,</p>
  
  <p>I have two videos like this,</p>
  
  <p><a href="https://i.sstatic.net/QbCsy.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/QbCsy.png" alt="enter image description here"></a></p>
  
  <p>at the end of first video i have to split the first video into two from center and reveal the second video like the following, </p>
  
  <p><a href="https://i.sstatic.net/wmG7t.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/wmG7t.png" alt="enter image description here"></a>
  any help would be appreciated</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-09-21T12:07:01.513Z
Comments.Text: ffmpeg is processing, not composition tool. But you can many tricks with it.
Comments.UserDisplayName: bukkojot
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-09-22T15:19:54.393Z
Comments.Text: I think you'd need a [custom filter](https://video.stackexchange.com/questions/15962/video-transitions-and-filters-how-to-create-custom-ones?rq=1) to accomplish that. You might find [this](https://github.com/hudl/HudlFfmpeg/wiki/Creating-Custom-Filters) useful.
Comments.UserDisplayName: Elder Geek
Tags: <ffmpeg><video-editor><transitions>
Title: How to get this transition using ffmpeg?
UserDisplayName: Jeffin
ThreadText: # How to get this transition using ffmpeg?
  
  (Asked by: username_0 on 2017-09-21)
  
  I have bee experimenting with ffmpeg on video transitions , Now am stuck in this transition , I have no where to go ,
  
  I have two videos like this,
  
  [![enter image description here](https://i.sstatic.net/QbCsy.png)](https://i.sstatic.net/QbCsy.png)
  
  at the end of first video i have to split the first video into two from center and reveal the second video like the following,
  
  [![enter image description here](https://i.sstatic.net/wmG7t.png)](https://i.sstatic.net/wmG7t.png)
  any help would be appreciated
  
  **Tags:** ffmpeg, video-editor, transitions
  
  > **Comments:**
  > **username_1**: ffmpeg is processing, not composition tool. But you can many tricks with it.  
  > **username_2**: I think you'd need a [custom filter](https://video.stackexchange.com/questions/15962/video-transitions-and-filters-how-to-create-custom-ones?rq=1) to accomplish that. You might find [this](https://github.com/hudl/HudlFfmpeg/wiki/Creating-Custom-Filters) useful.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_3 on 2017-09-23. Score: 2
  
  This needs a slightly elaborate filtergraph to do as described.
  
  ```
  -filter_complex
      "[0]split[b1][b2];
       [b1]crop=iw/2:ih:0:0[b1];
       [b2]crop=iw/2:ih:iw/2:0[b2];
       [1][b1]overlay=x='0-(W/2)*(t-DUR0)/D':enable=gte(t,DUR0)[ob1];
       [ob1][b2]overlay=x='W/2+(W/2)*(t-DUR0)/D':enable=gte(t,DUR0)[fv]
      "
  
  ```
  
  where `0` is video '1' and `1` is video '2'. `DUR0` should be replaced with duration of video '1' and `D` with duration of the effect.
  
  ---
  
  A curtain effect, like what Paul described, can be done like this:
  
  ```
  blend=all_expr='if(lte((W/2-abs(X-SW*W/2))/(SW*W/2),(T-S)/D),B,A)'
  
  ```
  
  where `S` is start time in seconds. (You may want/need to adjust the timestamps of the top video 'A' beforehand using `setpts`) and `D` is duration of effect. These two variables should be replaced with the required numeral values.
  
  I can't test either of these for a few days.
  
  
  ---
  
  