Editing — Kdenlive Manual 24.02 documentation
"A clip can be resized from its start or end by dragging its left or right edge. If you want a more precise resize, you can place the timeline cursor wherever you want the resize to end and use the menu Timeline ‣ Resize Item Start (default shortcut: ( or Timeline ‣ Resize Item End (default shortcut: ))
To even more precisely control the length of a clip, double click it in the timeline and adjust its duration using the Clip duration dialog. You can have frame-level accuracy with this method."
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