We are experimenting with a Roku app for Channels DVR. At the moment, it only allows for live TV playback. Since the Roku cannot playback mpeg2 directly, it requires a transcoding-capable Channels DVR server in your home.
If you want to try it out, install using https://my.roku.com/add/CHANNELSDVR
This is a highly experimental pre-alpha. We don’t have much experience with Roku apps yet, but hope to add more features as time goes on. Again, for now it only allows for live TV playback. If you’re trying to watch recordings on your Roku, you can still use the “Play on Roku” feature announced a few weeks ago: NEW: “Play on Roku” support (v2017.05.11.0158)