Audio Compression Question

I am backing up the concert DVD “Stop Making Sense” by the Talking Heads. I want to get the best possible audio in this backup. My question is, will the audio quality be noticeably degraded at 70 - 80% compression?

if it’s a DVD, the only thing that will be compressed is the video. the audio isn’t compressed during a transcode at all…at least not unless you choose to demux and re-encode using a higher level DVD authoring program.