Video filters alter the video. Of course they can only have effect if the video is not in copy mode (Copy means “do not change the video”), so the first thing you have to do is select a video encoder (something else than the default “Copy” option for video). Then, in the main window, clicking the Filters button opens the Video Filter Manager dialog where you can add filters.
If video has a selected encoder other than Copy, the processing chain is:
Filters are split into several categories: