Video window

Ive tried a ton of hosting sites. Some sites nothing happens. Others the video window pops up for a split second and then dissapears. What is going on here? I would like some help I have yet to see this work. 

This is my current config discord is the last place i just tried hosting. 

{
  "Permission Name": "WelcomeVideo.use",
  "Need Permission": false,
  "Welcome Video List": [
    {
      "Need Permission (Empty = none)": "",
      "Video URL": "https://cdn.discordapp.com/attachments/1185493654975033385/1193105324220096552/gasolinevideo.mp4",
      "Welcome Message (Empty = No Message)": "Welcome To Gasoline, Now playing video for you showcasing the map~ (You can use command /wv to disable)"
    },
    {
      "Need Permission (Empty = none)": "",
      "Video URL": "",
      "Welcome Message (Empty = No Message)": "Welcome To Our Server, Now playing video for you~ (You can use command /wv to disable)"
    }
  ],
  "Only first-time join the server": false,
  "Players can disable the WelcomeVideo (/wv)": true
}

Github also does not work viewer just pops up for a split second