Hi. The WMEncoder was being created ok, I just wasn’t getting all the events. I was running on XP anyway – the hotfix you mentioned appears to be for Vista. Still, the hotfix ought to be useful to a colleague of mine, so thanks for mentioning it.

I think you couldn’t define the WMEncoder object. So you couldn’t get Events. That’s why you did your way. It’s perfect. I did too.

There is a hotfix to install then you can use it

http://support.microsoft.com/default.aspx/kb/929182

Then you can use like below.

WMEncoder Encoder = new WMEncoder();
Encoder.OnSourceStateChange += new _IWMEncoderEvents_OnSourceStateChangeEventHandler(Encoder_OnSourceStateChange);

Encoder.OnStateChange += new _IWMEncoderEvents_OnStateChangeEventHandler(Encoder_OnStateChange);

Regards.