Set HTML5 video type correctly

As we can use the videos as they are, without conversion, we need to set
the video type correctly.

sigal/gallery.py

@@ -44,7 +44,8 @@ from .compat import PY2, UnicodeMixin, strxfrm, url_quote, text_type
 from .image import process_image, get_exif_tags, get_exif_data
 from .settings import get_thumb
 from .utils import (Devnull, copy, check_or_create_dir, url_from_path,
-                    read_markdown, cached_property, is_valid_html5_video)
+                    read_markdown, cached_property, is_valid_html5_video,
+                    get_mime)
 from .video import process_video
 from .writer import Writer
 
@@ -181,7 +182,10 @@ class Video(Media):
         self.src_filename = filename
         if not settings['use_orig'] or not is_valid_html5_video(ext):
             self.filename = self.url = base + '.webm'
+            self.mime = get_mime('.webm')
             self.dst_path = join(settings['destination'], path, base + '.webm')
+        else:
+            self.mime = get_mime(ext)
 
 
 class Album(UnicodeMixin):

sigal/themes/colorbox/templates/index.html

@@ -84,7 +84,7 @@
         <div style='display:none'>
           <div id="{{ mhash }}">
             <video controls>
-            <source src='{{ media.filename }}' type='video/webm' />
+            <source src='{{ media.filename }}' type='{{ media.mime }}' />
             </video>
           </div>
         </div>

sigal/utils.py

@@ -103,6 +103,13 @@ def is_valid_html5_video(ext):
     """Checks if ext is a supported HTML5 video."""
     return ext in ('.mp4', '.webm', '.ogv')
 
+def get_mime(ext):
+    """Returns mime type for extension."""
+    mimes = {'.mp4': 'video/mp4',
+             '.webm': 'video/webm',
+             '.ogv': 'video/ogg'}
+    return mimes[ext]
+
 class cached_property(object):
     """ A property that is only computed once per instance and then replaces
     itself with an ordinary attribute. Deleting the attribute resets the