user29468: I came across a music video on YouTube for Doom Eternal where an image appeared to have been transformed into a video under some sort of stretching transformation. 
What is this stretching transformation? How is it performed?

user26178: The overall steps are:
I. On a photo editor (Ps, Gimp, Photowhatever)

Duplicate the image several times, One per element of your final composition, for example. Background, player, monster 1, monster 2, ax.

Mask each element, normally with the lasso tool or similar, so you isolate the element on that layer.




For the background, you need to expand it a bit it to erase the element, You probably do not need to erase all the ax, just enough so when you move it you do not reveal the same ax behind the moving one.



Do the same on a monster if you need to delete some other monster part over it.

Export each layer as a single PNG file.


II. On a composition software
You could use Davinci Resolve, Hit Film or Blender which are great programs and free. Try with Davinci Resolve for this one.

Drag them into the timeline. Background on one layer, and monsters on another layer.



On the inspector Add keyframes on the scaling, making a loop.


For more specific information look for tutorials on how to mask, how to export and import files on the program you choose, and about the inspector on Davinci Resolve.
If you are paying Adobe, use Ps to mask and AE to composite. I prefer Davinci because you can see the waveform of the music, and playback in realtime to sync the animation.

29468: <p>I came across a <a href="https://www.youtube.com/watch?v=rJYBzFBpP_8" rel="nofollow noreferrer">music video on YouTube</a> for <a href="https://en.wikipedia.org/wiki/Doom_Eternal" rel="nofollow noreferrer">Doom Eternal</a> where <a href="https://cdn.mos.cms.futurecdn.net/4cJLsb4vhUzNcvVJiJEXwJ.jpg" rel="nofollow noreferrer">an image</a> appeared to have been transformed into a video under some sort of stretching transformation. </p>

<p>What is this stretching transformation? How is it performed?</p>
 26178: <p>The overall steps are:</p>
<h2>I. On a photo editor (Ps, Gimp, Photowhatever)</h2>
<ol>
<li><p>Duplicate the image several times, One per element of your final composition, for example. Background, player, monster 1, monster 2, ax.</p>
</li>
<li><p>Mask each element, normally with the lasso tool or similar, so you isolate the element on that layer.</p>
</li>
</ol>
<p><a href="https://i.stack.imgur.com/sDjfK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sDjfK.png" alt="enter image description here" /></a></p>
<ol start="3">
<li>For the background, you need to expand it a bit it to erase the element, You probably do not need to erase all the ax, just enough so when you move it you do not reveal the same ax behind the moving one.</li>
</ol>
<p><a href="https://i.stack.imgur.com/9EuOz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9EuOz.png" alt="enter image description here" /></a></p>
<ol start="4">
<li><p>Do the same on a monster if you need to delete some other monster part over it.</p>
</li>
<li><p>Export each layer as a single PNG file.</p>
</li>
</ol>
<h2>II. On a composition software</h2>
<p>You could use Davinci Resolve, Hit Film or Blender which are great programs and free. Try with Davinci Resolve for this one.</p>
<ol start="6">
<li>Drag them into the timeline. Background on one layer, and monsters on another layer.</li>
</ol>
<p><a href="https://i.stack.imgur.com/RbAv1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RbAv1.png" alt="enter image description here" /></a></p>
<ol start="7">
<li>On the inspector Add keyframes on the scaling, making a loop.</li>
</ol>
<p><a href="https://otake.com.mx/Foros/Video/Doom-Test.gif" rel="nofollow noreferrer"><img src="https://otake.com.mx/Foros/Video/Doom-Test.gif" alt="enter image description here" /></a></p>
<p>For more specific information look for tutorials on how to mask, how to export and import files on the program you choose, and about the inspector on Davinci Resolve.</p>
<p>If you are paying Adobe, use Ps to mask and AE to composite. I prefer Davinci because you can see the waveform of the music, and playback in realtime to sync the animation.</p>
