Add overlay to expression 4 video

I am recording a live webfeed using the Expressions 4 libraries. They have been an absolute dream to use, with the small exception that i cannot seem to draw on top of the video using graphics.

I am trying to put a watermark in the corner, and add a time stamp to the top left corner. Previously i had been using Aforge and it worked well enough, but 开发者_StackOverflowit is too much work to try and get audio into your video files(lengthy conversions BTC). Expressions gives me an easy way to capture both, but apparently at the expense of many key events.

You can create a WPF canvas with Expression Design to use as an overlay. You can also animate it with Blend, though my experience is that not all animation types are honored.

Here's a link to a brief walkthrough of what to do: http://blogs.msdn.com/b/expressionencoder/archive/2008/07/01/8677762.aspx