Translations:Avidemux - Cutting out sections of video/8/en
From Manjaro
After the video is loaded it can then be edited. So the first thing is to drag the bar that you'll find down near the bottom of the Avidemux screen, through the timeline of the video until you get as close as you can to the start of the part of the video that you want to cut out. If you want to start cutting from the beginning of the video, if should default to that position. Next go to the Menu Edit > Set Marker A to indicate that this is the point you want to begin cutting from.