Simply drag the file into the browser. Press Ctrl+Shift+I → Media tab to see active decoder (should show "OpenH264" on systems without native H.264 support).
The term refers to a specific video codec library provided by Cisco . It is frequently mentioned by viewers who encounter technical hurdles or are looking for optimized ways to stream the show.
ffmpeg -c:v libopenh264 -i input.mkv -f null -