Bit rate will vary depending on how much you want to be able to store on the disk.
When I make my dvds, (Using ConvertXtoDVD) it usually tells me that it is converting to around 1500kB/s, for over 5 hours worth of content, and still looks pretty good.
So a 2000kB/s video stream woulod still look good on a DVD, 15000 is quite a bit over the top.