I've searched the docs one-by-one. I seek a simpler way to repeat a frame. This: split[1][2],[1]setpts=(N+floor(N/4))/FR/TB[3],[2]select=eq(mod(n\,4)\,3),setpts=(N*5+4)/FR/TB[4],[3][4]interleave works, but perhaps there's an easier way that I'm just not seeing. Suggestions are welcome. Thanks! - Mark.