VH Mixer Source

"VH Mixer Source" (VHMixerSource) is a DirectShow-based filter which composes video and audio tracks into single movie. It facilitates mixing of video and audio files, text, transparent (gifs) and non-transparent (jpegs) images.

VHMixerSource supports seeking, smooth transitions (source & target rectangles, alpha blending, font, text, text color & text background color, text alignment, volume). For example, it is possible to add Ken Burns still photo effect by changing source rectangle, and it is possible to move & scale tracks position on frames by changing target rectangle.