sfp and dvd 5.1
You can't. However you can use AC3 passthrough via the SPDIF w/ a Dolby Digital receiver that decodes this.
Or, if you're making your own surround from your own material - you can use the Surround Mixer and output 5.1 from that mixer, record it/encode it into 5.1 using an external program and burn that.
Or, if you're making your own surround from your own material - you can use the Surround Mixer and output 5.1 from that mixer, record it/encode it into 5.1 using an external program and burn that.