I have not tried it, but what about Film9? https://contact41766.wixsite.com/film9/home-1
I have not tried it but Xmedia Recode has a lot of options under audio conversions. Its free https://www.xmedia-recode.de/en/
I am guessing that your rip is in Mkv format, so you likely want to use MKVToolNix https://mkvtoolnix.download/ to separate the video and audio files. Watch video https://www.youtube.com/watch?v=aa1VYQ-irWs
once you have the audio file you should be able to clean it up. with an audio editor https://www.fosshub.com/Audio-Editors.html, I like Audacity. video how to remove noise in Audacity https://www.youtube.com/watch?v=gnEWfAEONTA
video Audacity Tutorial: Converting Between Stereo & Mono Audio https://www.youtube.com/watch?v=V4_Esbzz0DQ
You would then use MKVToolNix to combine the video and audio in one file. If you need to transcode between file formats I would use ether HandBrake or Xmedia Recode https://handbrake.fr/ https://www.xmedia-recode.de/en/
HandBrake: https://handbrake.fr/ video https://www.youtube.com/watch?v=RW0QNpAXEUE
XMedia Recode: https://www.xmedia-recode.de/en/ videos https://www.xmedia-recode.de/en/help/convert/video-tutorials.php
I guess you would be talking about transcoding? Anytime you change a file, you are looking at a loss of quality. You probably want to use HandBrake, https://handbrake.fr/ I came across this article that should get you started. http://www.lighterra.com/papers/videoencodingh264/ and https://www.techspot.com/article/1131-hevc-h256-enconding-playback/ which mentions StaxRip https://staxrip.readthedocs.io/introduction.html I have not tried it.
You may want to try XMedia Recode https://www.xmedia-recode.de/en/ which I like.