You’re using the MKV Unprocessed profile which has ffmpeg directly create a MKV file
order=ffmpeg,copy
copy-ext=.ts
copy-remuxto=.mkv
copy-audiodelay=skip
ffmpeg-general=-threads 0
ffmpeg-video=-ss 0 -vcodec copy -map 0:v -sn
ffmpeg-audio=-acodec copy -map 0:a
ffmpeg-audioac3=-acodec copy -map 0:a
ffmpeg-ext=.mkv
Change
ffmpeg-ext=.mkv
To
ffmpeg-ext=.ts
ffmpeg-remuxto=.mkv
This will make MCEBuddy use MKVToolNix to convert the TS file generated by ffmpeg to MKV.
The reason MCEBuddy uses ffmpeg to create MKV files directly in this Unprocessed profile is that some of the files created by MKVTools don’t play with some software and some Samsung TV’s. See this post for details:
Feel free to share this feedback/link with the other forums where you found the above advice as well.