How to fix pixelated video

#1
Hello.
I want to edit video (put some additional sounds on top)
Everything works perfect, but result is bad. I get pixelated video.

I dont know how to fix this issue. I use Movie Studio Platinum 13
Please help :/

Original 656 MB:
1.png
original.png

After edit 721 MB:
edit.png
edit_b.png
 
#3
It was PAL , 1920x1080 , tested a lot of possible settings. Nothing helped.

But.. i found solution: Add new audio to existing video.
And it worked perfect. Used application: Avidemux
 
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