A HTML5 video I am implementing is not working in Internet Explorer 9. After some debugging, I found that the mime type of the mp4 file is as `application/octet-stream`. However, in my `.htaccess` file I have,

```
AddType video/ogg  .ogv
AddType video/mp4  .mp4
AddType video/webm .webm

```

What have I missed in defining mime types?