Why is one of my youtube videos black?

Ok. So I use ScreenFlow to record on my mac. I used it for a while and have making youtube videos. I just uploaded a video of minecraft survival games. I looked on my channel and the video is black but I still have the audio… There's also a note that came up right as I uploaded it saying "This video may be blocked in some countries." I don't know why. Can someone please help me?!

Something shown in the video could be copyrighted for the block thing and it's probably just a glitch in the conversion when it was uploading

I've come across the same sort of thing.
And in my case at least I just deleted the video and re uploaded and it solved the problem at least for me, give it a try.

Also when i re uploaded i used a different browser as well.