Plex codec / file format compatability

[ed]

Actually, you may find these articles useful https://nascompares.com/answer/best-vide...anscoding/
https://nascompares.com/nas-for-storage-...x-support/
It shows the best video files for Plex.
Regarding the best app for video conversion, you might find this useful https://www.winxdvd.com/video-transcoder...vs-vlc.htm

I hope this helps.