support ripping audio tracks from concert dvds. rip by chapter and fill in metata, support multichannel audio

I don't think you could fill in metadata automatically though it would be a differentiating feature.

Right now your program just does what dozens already do. Maybe yours is better :) but its hard to convince people with a me-too feature list.

Try to support audio really well. If you are really good you will support DVD-A, SACD or TrueHD or DTS-MA to mkv.