Hi,
We do have H.264 support with AllowProprietaryMediaFormat enabled. The key is there are different flavors of this method and you must be consistent with other options. For example, if your code is based on TabbedBrowser sample application, then in App.xaml.cs/vb you would add the following code:
Code: C#
EO.WebEngine.Engine.Default.Options.AllowProprietaryMediaFormats();
Note here it calls this method on EO.WebEngine.Engine.Default.Options because all other options are set on this object in the same file. On the other hand, if you wish to use EO.WebBrowser.Runtime, then make sure everywhere uses EO.WebBrowser.Runtime. These two flavors are related but the easiest way to work with them is to stay with one flavor throughout.
Once you added the above code, you should see html5test.com passes H.264 test.
Thanks!