... MSU Graphics & Media Lab (Video Group) . It is a free AviSynth filter for fixing situation when odd and even lines of source frame are placed in alternate output frames and other similar problems. ... If this position exists, optimal odd lines are placed into the current frame, otherwise (for example when odd lines field is located in one frame after even lines, and we are in the last frame) the odd field is interpolated, or no changes are done (behavior depends on filter's settings). ...