FFMPEG script to cut off front portion of video with -ss 00:00:00 and make video of a total length with -t 00:00:00. Converts long video to a short video. Use counter in VLC to find places to cut. For safety, Copy and rename video before working on it. Make sure script uses same type of file as video, i.e., .MKV or M4V Use this script to cut videos into useful segments, then use MKVMERGE to add the segments together. (See my other tutorial on mkvmerge.) The biggest problem in using this technique is in compiling FFMPEG correctly. It does not come with Ubuntu, per se. You have to go online and install it manually.