Hi @dewood57,
Thanks for posting on the Roku Community!
We're happy to assist you with your problem playing OBS MP4 recordings with Roku Media Player. Please try to remove the channel, restart your CPU, and add the channel back. In some cases, removing the channel and reinstalling it may help. Also, if you use a DLNA server that does not support transcoding or playing directly from a USB drive, you may need to convert the files first. There are several applications available for converting videos. You can check out this link here to learn more about how to use Roku Media Player to play your videos, music, and photos.
Let us know if this works for you.
Best regards,
Eunice
Eunice L.
Roku Community Moderator