MediaLooks Video Mixer   
http://www.medialooks.com

MediaLooks Video Mixer is a DirectShow filter for real-time mixing of several video streams coming from different video sources (such as cameras, files or static images). MediaLooks Video Mixer features: - change output image size even during playback - specify source/destination rectangles for each input video - specify alpha (transparency) for each stream - allows different input colorspace, size and FPS - movie files can be used as input streams - images can be used as input streams - output FPS can be automatically or manually set - allows input format changes (size and colorspace) during playback Supported input/output colorspaces: YV12, I420, YUY2, YVYU, UYVY, RGB24, RGB32.