title: Video composition with Media Foundation
body: <p>I'm trying to composite 2 videos into one (audio too) and save as a file. Say, show a source video on the left half of the final video and the ohter source on the right. Any encoding is fine. Not with DirectShow.</p>
  
  <p>I suspected IMFVideoMixerControl may be related to this but unfortunately I'm too new to MF to detemine the right step to take in order to achieve this. If you could give me some guidance or if any example available on the web, please let me know. Thank you for your help.</p>