If you are seeing a "codec not supported" error or a black screen when trying to watch this specific episode, follow these steps:

Some older or restricted devices (like certain Smart TVs or work computers) may not have a license to decode H.264 via standard means. OpenH264 is sometimes offered as a downloadable plugin (e.g., in Firefox or Opera). Searching this term leads to guides on installing the Cisco OpenH264 plugin.

A user might have an MKV file of Outlander S03E10 that won’t play correctly on their media player, TV, or smartphone. Searching OpenH264 helps them identify the codec and find compatible players (e.g., VLC Media Player, MPV, or a device with H.264 hardware decoding).