Landscape is a common format for videos on Facebook. A video that is already landscape often only needs a clean output: the right dimensions, no burned-in bars and nothing important under the player’s controls.
If your video has black bars, such as a screen recording, FrameJet removes them automatically before it is output at 1920 × 1080 pixels. If it is portrait, you place the whole picture into landscape with a filled border on the left and right.