title: Linux PdfToText function return blank text file
body: <p>I've used a linux function to convert a list of PDF files to text.</p>
  
  <p>Command:</p>
  
  <pre><code>pdftotext -htmlmeta
  </code></pre>
  
  <p>This work well for most of my files.</p>
  
  <p>but for a small amount of them, this return me a blank text file.</p>
  
  <p>My unsuccesssfull pdf files were not encrypted, not securised by user / password and they were not read only.</p>