freebsd-ports/multimedia/dvdauthor/files

To create mpeg files suitable for a DVD, you can use the transcode
port.

I use the following options:
	transcode -i .... -y mpeg,toolame -F d -E 48000 -b 224 -o output

This creates the following files:
	output.m2v: video, bitrate 10Mbps (use -w to change that rate)
	output.mp2: MPEG 1 Layer II audio, 48KHz, bitrate 224Kbps

Then multiplex the streams:
	tcmplex -i output.m2v -p output.mp2 -m d -o output.mpeg

You can then use the resulting output.mpeg file with dvdauthor.