Question: I have an interlaced video stream and need apply a filter (any filter that takes two frames as input , for example tblend or lut2) on custom video frames and place output of them between mainframes like this : ...

Question: The command below blends input2 into input1 using a binary of *if expressions featuring the between statement’s t variable. As such, output = input1, but with input2 at 00:00:03- 00:00:05: ffmpeg -y -i input1.mkv -i input2.mkv -filter_complex "[1:v][0:v]scale2ref[v1][v0];[v0][v1]blend=all_expr='A*if(between(T, 3, ...