I just expected you would stream to point X in the stream that would be to the timestamp set to start and then to point y which would be the end. Obviously it would have to be able to figure out how the streamed file would map to time, which I don't know how to do which is why I said I would like a tool that did it other than announcing I made a tool that did it myself.
Of course obviously some tools like yt-dlp etc. have this capability with the --download-sections property but I want something for torrents.