   DirectX9 Question.
  Hello. I am implementing a filter which renders to a direct3d texture surface like in the Texture3D9 sample only in ARGB32 instead of RGB24. In the DoRenderSample function I need to know the pitch of the video sample so that I can copy it properly to the texture. I have looked at using the GetVideoInfoParameters function, but ideally I dont want to have to call this for every frame! Is there some way to determine the pitch in the SetMediaType method?? Or is it that I have got all of this wrong and I can just use the video width as the pitch? Thank you for any help. Mark Coleman 