title: Add multiple metadata in video using ffmpeg command
body: <p>Command to add single metadata working fine</p>
  
  <pre><code>ffmpeg -i '/var/www/html/public/uploads/wp-video/akka.mov' -metadata kKeyContentIdentifier='com.apple.quicktime.content.identifier' '/var/www/html/public/uploads/video-thumb/updated-akka.mov'
  </code></pre>
  
  <p>Add multiple metadata command, I pass the multiple metadata tag like below</p>
  
  <pre><code>ffmpeg -i '/var/www/html/public/uploads/wp-video/akka.mov' -metadata kKeyContentIdentifier='com.apple.quicktime.content.identifier' -metadata kKeyStillImageTime = 'com.apple.quicktime.still-image-time' -metadata kKeySpaceQuickTimeMetadata = 'mdta' '/var/www/html/public/uploads/video-thumb/updated-akka.mov'
  </code></pre>
  
  <p>Its not working, is there any other way to pass multiple metadata in command?</p>