title: Convert textures to ETC1 in a batch using etcpack
body: <p>I have to convert my game's texture files to ETC (Ericsson Texture Compression) format,
  using the command line conversion </p>
  
  <pre><code>etcpack img.jpg new-img.jpg
  </code></pre>
  
  <p>I have 100+ files in a the folder and using the etcpack tool on each file from command line is a pain. </p>
  
  <p>Can i write a dos script or batch file to do that and how should i do it for all files in my current folder and subfolders.</p>