I realize I could convert or re-encode before streaming. But that's what Plex is for, the server is supposed to transcode it if the client doesn't support the format.
So basically you've confirmed there's a problem with the tivo plex client, that it's not just me. It surprises me there is a similar issue in apple tv/etc but I don't have one of those, it's my Tivo I want to work right, and as mentioned my Roku does work right so the server is able to do it.
So I'm wondering if there's a workaround like there is for DTS, or better yet how to get the actual client fixed thru an update or whatever.