Laravel Video Tag only get Auio not show picture

I got this error by this code.I think code is ok ,what wrong in video. Only hear audio ,not see picture. Please suggest me. [https://i.stack.imgur.com/pMJvR.png]

    <video width="450" height="300"  controls >

     <source src="" type="video/mp4">
     <source src="" type="video/ogg">
        Your browser does not support the video tag.

   </video>