PDF to JPEG

Don’t most pdf viewers have an export to image option?

AVC to MP4

Do you actually have files with an .avc extension? AVC is a codec that can be used in many different container formats, including MP4. Where did these files come from?

OPUS to MP3

I actually agree that most audio conversion tools are needlessly awkward. Audacity will convert these just fine, though doesn’t really do bulk conversion. Foobar2000 will do it in bulk if you’re on windows.

This was my exact experience as well. I’ll never know how Plex compares to Jellyfin because I immediately noped out when I ran into the account creation.

Frankly baffling to me that anyone with the wherewithal to self host thought that was okay.