I've gotten 720p HD to encode with Handbrake
using a super bit, (high bit rate), DVD. It was
just a test but seems to have worked fine.
This is what I used for HandbrakeCLI;
HandBrakeCLI --no-dvdnav --cpu 8 --large-file \
--input /dev/sr0 --longest \
--audio 2 --arate 48 \
--optimize --format mp4 --vb 6000 --deinterlace \
--width 1280 --keep-display-aspect \
--output my_video_file.mp4
You should specify which HD standard you are
asking about, as 1080p 24/30fps is now available
on some Roku streaming media players.
Arwen Evenstar
Middle Earth