Can't play video or audio at all on my own server while playable on your demo website

I'm using 2019.12.25 version, can't play any video or audio after following official installation wizard: http://blog.filerun.com/how-to-install-filerun-on-centos-7/, 

when playing mp3 audio, it shows "failed to load audio file: undefined",

when playing mp4 video, no response after short time loading.

Same file play very well on your demo website.

SYSTEM: CentOS 7