The video is either being transcoded or direct streaming (audio only being transcoded). The red line is how far ahead that process is.

Had to scroll too far for Stratum! The watch app is also why I use it so that I can keep my phone far away from me while I work. Game changer. Surprised more don’t use it.

By your logic the *arr suite isn’t self hosted either since they rely on metadata cache servers.

In fact Jellyfin relies on external services for their metadata too!