title: FFmpeg Conversion Error
body: <p>I am trying to use FFmpeg to convert videos to the .webm format. I have installed all the dependencies listed here: <a href="http://www.videochat-scripts.com/install-ffmpeg-mplayer-flvtool2-yamdi-x264-theora-mp3lame-vorbis-ogg-faac/" rel="nofollow">http://www.videochat-scripts.com/install-ffmpeg-mplayer-flvtool2-yamdi-x264-theora-mp3lame-vorbis-ogg-faac/</a></p>
  
  <p>I am using the following expression:</p>
  
  <pre><code>ffmpeg -i[imput.avi] [output.webm]
  </code></pre>
  
  <p>But I get the following error:</p>
  
  <pre><code>Could not find input stream matching output stream #0.0
  </code></pre>
  
  <p>I have tested to make sure I have the correct codecs/formats installed:</p>
  
  <pre><code>$ ./ffmpeg -formats 2&gt; /dev/null | grep WebM
   E webm            WebM file format
  
  $ ./ffmpeg -codecs 2&gt; /dev/null | grep libvpx
   DEV    libvpx          libvpx VP8
  </code></pre>
  
  <p>I hope someone can help?</p>
  
  <p>Thank you.</p>