title: ffmpeg not working for AWS S3 signed urls
body: <p>I'm trying to convert video format from <code>mp4</code> to <code>wav</code>. It works fine with public urls:</p>
  
  <pre><code>ffmpeg -i https://s3.amazonaws.com/my-fake-bucket/folder1/video.mp4 -vn -acodec pcm_s16le -ar 44100 -ac 2 video.wav
  </code></pre>
  
  <p>But when i use AWS's <code>signed-url</code> to convert it reports </p>
  
  <pre><code>[https @ 0x1bf6c40] HTTP error 400 Bad Request
  </code></pre>
  
  <p>Any idea what needs to be done for accessing signed urls using ffmpeg.?</p>