You should use H.264.
Roku supports both H.264 and H.265, but the HEVC H.265 is supported by Roku 4K capable devices only, such as Roku 4, Roku Premiere, etc. For your Roku 2 and 3, H.264 will be better. See Roku HEVC support here.
We’re upgrading Roku Community to bring you a faster, more mobile-friendly experience. You may notice limited functionality or read-only access during this time. Read more here.
Planned Downtime:
Community will be unavailable for up to 24–48 hours during the upgrade window during the week of May 19th and you may notice reduced functionality.
In the meantime, for additional assistance, visit our Support Site.
We're sorry for this disruption — we’re excited to share what’s next!