user24787: I have a few hundred few-second-long video clips (c001.mp4-c999.mp4)
and need to merge them into a clip slideshow.  This is very easy - I drop them into iMovie and click "slideshow", done! 
However - I want to fit more clips in less time.  So I was hoping to show 2 clips at once, and stack vertical-video clips side-by-side.
Ideal would be some way to take a script of start times and upper-left positions, and render it to a combined flattened video?  (assuming basics like "no resizing" and "later clips are stacked on top of earlier clips if the earlier clip hasn't finished playing yet")
file:c001.mp4, t:0:05:15, x:500, y:0 
file:c002.mp4, t:0:09:25, x:0, y:0
file:c003.mp4, t:0:12:00, x:500, y:0
etc. 


user24746: While having some fun in Python programming language I found a library that allows users to write custom code to overlay (possibly) infinite amount of clips.
MoviePy

Hope this helps!

24787: <p>I have a few hundred few-second-long video clips (c001.mp4-c999.mp4)
and need to merge them into a clip slideshow.  This is very easy - I drop them into iMovie and click "slideshow", done! </p>

<p><strong>However</strong> - I want to fit more clips in less time.  So I was hoping to show 2 clips at once, and stack vertical-video clips side-by-side.</p>

<p>Ideal would be some way to take a script of start times and upper-left positions, and render it to a combined flattened video?  (assuming basics like "no resizing" and "later clips are stacked on top of earlier clips if the earlier clip hasn't finished playing yet")</p>

<pre><code>file:c001.mp4, t:0:05:15, x:500, y:0 
file:c002.mp4, t:0:09:25, x:0, y:0
file:c003.mp4, t:0:12:00, x:500, y:0
etc. 
</code></pre>
 24746: <p>While having some fun in Python programming language I found a library that allows users to write custom code to overlay (possibly) infinite amount of clips.</p>

<p><strong><a href="https://zulko.github.io/moviepy/getting_started/compositing.html" rel="nofollow noreferrer">MoviePy</a></strong></p>

<p><a href="https://i.stack.imgur.com/lYpU4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lYpU4.png" alt="enter image description here"></a></p>

<p><strong>Hope this helps!</strong></p>
