Media processing, transcoding, display fixes

- Added configurable options
  - Video
    - vp8_quality
    - vp8_threads
    - vorbis_quality
  - Audio
    - spectrogram_fft_size
  - ASCII
    - thumbnail_font
- Cleaned up ascii.asciitoimage
- Cleaned up video.transcoders
- Changed default video quality settings to better quality
- Changed default audio spectrogram solution to the double.
- Added a hacky notice for Firefox users instead of the broken range
  input.

mediagoblin/static/js/audio.js

@@ -210,8 +210,14 @@ var audioPlayer = new Object();
         $('<div class="seekbar"></div>').appendTo(im.parent());
         $('<div class="audio-control-play-pause paused">▶</div>').appendTo(im.parent());
         $('<div class="audio-currentTime">00:00</div>').appendTo(im.parent());
-        $('<input placeholder="Range input not supported" class="audio-volume"'
-                +'type="range" min="0" max="1" step="0.01" />').appendTo(im.parent());
+        if (navigator && /Firefox/.test(navigator.userAgent)) {
+            $('<p class="message_warning">Sorry, Firefox does not support the '
+                    + 'range input type, you won\'t be able to change the volume</p>')
+                .appendTo(im.parent().parent());
+        } else {
+            $('<input type="range" class="audio-volume"'
+                    +'value="1" min="0" max="1" step="0.001" />').appendTo(im.parent());
+        }
         $('.audio-spectrogram').trigger('attachedControls');
     };
 })(audioPlayer);