Movie extraction and editing software
YoutubeDLG: for downloading HD video from youtube. Avidemux Open the software. Drag the movie to the software window. In video output, choose "Mega AVC (h.264). In Audio output, choose "AAC (lav)". In the slide, use the slider and the "A" and "B" icon to select the segment that you want. Click on the Floppy disk button to save the segment. If you need to crop your video, select from the main menu, Video -> Filters -> Crop.