```ruby
# Be sure to restart your server when you modify this file.

# Add new mime types for use in respond_to blocks:
# Mime::Type.register "text/richtext", :rtf
```

Fix video dose not play in IE9 or later
user
```ruby
# Be sure to restart your server when you modify this file.

# Add new mime types for use in respond_to blocks:
# Mime::Type.register "text/richtext", :rtf

Mime::Type.register 'video/mp4', :mp4
Mime::Type.register 'video/webm', :webm
Mime::Type.register 'video/ogg', :ogv
```
assistant