title: FFMPEG converted mp4 file does not play in firefox and chrome
body: <p>I have used FFMPEG command to convert flv video file to mp4 and use html5 video tag and play video in browser. But after the video is converted to mp4 using ffmpeg it does not play in firefox and chrome browser. It displays a error saying 'No video with supported format and MIME type found'. I have added the code below, Please help.</p>
  
  <pre><code>cmd /C ffmpeg -i INPUT_FILE_PATH -y -ar 22050 -ab 512 -b 800k -f mp4 -s 514*362 OUTPUT_FILE.mp4"
  </code></pre>