user10890: I have been editing a video which has rendered fine up until recently, I had it in a .mp4 format on a windows machine editing using wevideo, and I sent it to my friend who edited it on a mac, I think using aftereffects, and converted it to a .mov and now it has this strange effect, but only when I download it to the local machine (by the way the black bars are fine, what I am confused about are the horizontal lines):
before:

on my phone after:

on my computer after:

What could be going on and how should I fix it?
thanks!

user10892: Those horizontal lines you're seeing are what you would call Interlacing and it's usually done in an attempt to increase a video's frame rate without using more bandwidth (in other words, make it play smoother and take up less space).  You can easily get rid of this by running your video through a program like Handbrake and using their "Decomb" filter.
There are other, more advanced methods to clean this up as well.
I personally use Davinci Resolve and I've read that you can even do it in VLC Media Player, but I think handbrake is the quickest and easiest way to accomplish deinterlacing your video.

10890: <p>I have been editing a video which has rendered fine up until recently, I had it in a .mp4 format on a windows machine editing using wevideo, and I sent it to my friend who edited it on a mac, I think using aftereffects, and converted it to a .mov and now it has this strange effect, but only when I download it to the local machine (by the way the black bars are fine, what I am confused about are the horizontal lines):</p>

<p>before:
<img src="https://i.stack.imgur.com/0c8na.jpg" alt="Before:"></p>

<p>on my phone after:</p>

<p><img src="https://i.stack.imgur.com/0HNKL.png" alt="enter image description here"></p>

<p>on my computer after:</p>

<p><img src="https://i.stack.imgur.com/WcG6j.png" alt="enter image description here"></p>

<p>What could be going on and how should I fix it?</p>

<p>thanks!</p>
 10892: <p>Those horizontal lines you're seeing are what you would call <code>Interlacing</code> and it's usually done in an attempt to increase a video's frame rate without using more bandwidth (in other words, make it play smoother and take up less space).  You can easily get rid of this by running your video through a program like <a href="https://handbrake.fr/" rel="nofollow">Handbrake</a> and using their "Decomb" filter.</p>

<p>There are other, more advanced methods to clean this up as well.</p>

<p>I personally use <a href="https://www.blackmagicdesign.com/products/davinciresolve" rel="nofollow">Davinci Resolve</a> and I've read that you can even do it in <a href="http://www.videolan.org/vlc/index.html" rel="nofollow">VLC Media Player</a>, but I think handbrake is the quickest and easiest way to accomplish deinterlacing your video.</p>
