forced transcode to

[theguymadmax]

To build on what Dread said, to enable AV1 transcoding on the server, navigate to Dashboard -> Playback -> Transcoding and check the box for "Allow encoding in AV1 format." Keep in mind that if your server doesn’t support AV1, you may encounter playback issues.

Also on the WebUI, click on your profile picture in the top-right corner of the homepage, then go to Playback. From there, you can choose your preferred video codec for transcoding.