I tried several files I already use, via hdd on my oppo bluray. None worked. I did download a test file from another roku usb thread and it worked. I'll do more experimenting and report findings.
So far I've tried some mkv files with and without subtitles embedded or seperate srt file. Tried mp4 with same. Can play some via roku media player usb.
Ripping Caddyshack now to mp4 and its mono, no subs. One suggestion was to use "web" setting to place file info early in video instead of end.
Ho ho ho
***Update***
Just tried a small test file that works on the ruku usb player, its mkv with embedded subtitles, works fine. Tried with MyMedia and it wouldn't even see the file. This was only a 30mb file so eliminated the larger file issue (and it error-ed saying the older was empty anyway). Tried a small home rendered mp4, which mymedia did see, but it would instantly go back to file title. This was only about 10mb. So far having zero luck finding what will play as far as a template for future rips. Once the mp4 of caddyshack finishes I'll give that a try, as Vidcoder setting for "web optimized" was used (Vidcoder being the new GUI for Handbrake).
"I might be moving to Montana soon..."
FZ