FFmpeg video cutting
ffmpeg -i <ifile> -ss hh:mm:ss.ms -to hh:mm:ss.ms -metadata Title="NEW TITLE" -c copy -map 0:v:0 -map 0:a:1 <ofile>
-ss establishes the start of the interval. -to the end. -map maps different video and audio streams from the input file into some other index in the output file. -metadata lets you set EXIF key=value tuples in the container, if available—I've yet to try with MKV archives.