Actually, that is a remnant I missed during the change to make the defaults deviate some from the YouTube preset. I am changing this to be (5 * FPS) per the new defaults. YouTube does just fine when you deviate from their recommendation. They simply needed to give people some target to prevent getting crap (e.g. MPEG-4 part 2 simple profile), and Shotcut needs a preset to match what they published. However, that recommendation gives quite large file size that people complain about.