I have a problem exporting a video from Blender (Cycles Render) with Alpha Channel. Generally it's a scene with sailplane flying about a camera positioned near to the floor. In addition to this it is a camera with a fisheye lens, but I don't think this changes anything. I failed to export the video with alpha in blender, so I exported the 500 frames to pngs with an alpha channel. I tried many things, but did the job by now. The target system is Digital Sky 2.