title: FFMPEG batch for loop with multiple inputs
body: <p><em>What we have:</em></p>
  
  <p><strong>test.mp3
  test.mp4</strong></p>
  
  <p><em>We want to merge this using ffmpeg</em></p>
  
  <pre><code>ffmpeg -i "test.mp3" -i "test.mp4" -c copy D:\test_final.mp4
  </code></pre>
  
  <p>The thing is we just need this to do for tons of videos.</p>
  
  <p><em>What we currently have:</em></p>
  
  <pre><code>for %%a in ("merge\*.*") do ffmpeg -i "%%a" -i "%%a" -c copy D:\%%~na
  </code></pre>
  
  <p>So, what's the correct form? I have no idea :/</p>
  
  <p><strong>In <code>merge</code> there are always mp3 and mp4 files with the same name.</strong></p>