A possibility that you might want to try, given that you have the necessary hardware, would be to use the Dreamcast port of NetBSD or Linux to activate the Dreamcast like any other UNIX box. That'd activate the Sega Broadband adapter and the GD-ROM drive, and then you could then transfer (say, via FTP) the files you wanted off the drive to a remote server.
That should work, anyway. With the Sega broadband adapter it is possible to make NetBSD run off an NFS share, so you don't need to keep the Dreamcast CD in the thing, thus allowing you to switch discs.
Appearently, Dreamcast video files are just MPEG files (
that can be created with TMPGEnc Plus to boot), so you should be home free from there, unless they're encrypted...
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