Since Tivo Desktop died in 2021, it would be incredible to be able to mount (OS level) a Tivo drive removed from an old Tivo and be able to either index and play the videos, or transcode them and load them into Plex. I would think it is a combination of enabling the mfs filesystem drivers and some transcoding codecs - after knowing where on the drive to look for the archived videos. A load all single function, and then the user would delete what they don’t want would be sufficient for the interface. IDE to SATA adapter and other details would be left to the user.
Just a general request. I appreciate any consideration
Doing so requires operations on a much lower level than Plex server is usually doing.
Plus, Plex server does run on a multitude of operating systems. So doing the conversion inside of Plex is simply not possible on many platforms.
Because of that (and the fact that the TiVo platform is internationally not as prevalent as you might think it is) this functionality will very likely never materialize inside of Plex.
You could try KMTTG and pull your video off the drive from the running Tivo.
The main project page: https://sourceforge.net/projects/kmttg/
Note: Although the original author has abandoned the project, it has been forked to GitHub and is actively being maintained in 2023. Specifically, you will need a new certificate for KMTTG to access your Tivo.
The active forked project is here: https://github.com/lart2150/kmttg
I use this regularly to pull my content off my Roamio OTA and use MCEBuddy to transcode it to h.265 in MKV files and then placed nicely into the show/season folders ready for Plexx to serve it up.