Video Issues

I installed the lates plugin and I add .mp4 video URL. It showing me “Video Issues” and video is not playing.

Once I click on error, it is showing following.
Analysis of http://xxxxxxxxxxxx.mp4

Mime Type: text/html
Video:

Can’t check the video (HTTP 500)!
unable to determine file format

https://ww.wp.xz.cn/plugins/fv-wordpress-flowplayer/