( Diese Seite in Deutsch )
DeleteFrame(clip clip, int frame_num)
DeleteFrame deletes a single frame, given as an argument. The sound track is not modified, so if you use this filter too many times in a row you may get noticeable desynchronization.
If you want to delete a range of frames (a to b, say) along with the corresponding portion of the soundtrack, you can do it like this: Trim(0,a-1) ++ Trim(b+1,0).