Media Encoder Render Black Screen Video

My Computer: M1 Mac mini 8GB

Hi all, 
I am working on a template flag animation, after doing all the editing when I export it and add it to the media encoder it shows a black-screen video. (I use H.264 because I like to keep it low file size and Need to get it in MP4 format) In the media encoder, it shows a black screen and not a preview video.

So, I decided to use After Effects inbuild render and it renders QuickTime format. But that time sometimes I get instant black glitches. I don't know what's going on. Down below I attach a few screenshots of my com setting. I can not render in quick time in using a media encoder. Only need to use inbuild render in after-effect

Please help adobe