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: Before:

on my phone after:

enter image description here

on my computer after:

enter image description here

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


  • 1
    Wrong encode settings? See @JohnManly's answer.
    – p2or
    Commented May 19, 2015 at 18:38

1 Answer 1


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.

  • 1
    @nosyarg instead of encoding the video again thus loosing more detail and quality you should tell your friend to pick a better output format, progressive instead of interlaced if possible. While most programs should be able to detect interlaced content and display it without combing, interlacing remains a crude hack from the CRT era. AFAIK interlaced formats have been dropped with the move to UHD.
    – LiveWireBT
    Commented May 20, 2015 at 7:50

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