The Lossless Cut scrip to use userjobs in conjunction with MythTV's commflag and editing UI to create loss less cut mkv video files. Lossless Cut supports multiple video, audio encoding types and subtitles formats.
This is updatec to python3 and mythtv v32 version of R.D. Vaughan work.
For install/config - see: https://www.mythtv.org/wiki/Lossless_Cut
happy converting