Trickplay and Chapter Images storage location.

[BaltasarOnRails]

I'd like to chime in with my use case: I do not let the Jellyfin instance that serves the video transcode anything. It's low power. So far I used a second jellyfin instance on a fast computer in the network to create the trickdata in Jellyscrub on a GTX 3070, the trickdata was then stored next to the media files. In other words, I'd offload trickdata generation to a different machine in the local network.