MOST of the Silverline DVD~A 5.1 titles licensed from the Sanctuary Records label were UPSAMPLED stereo and IMO, sound MUCH improved when one plays the MLP DVD~A stereo mix instead. Of course, the Live From The Front Row series (with few exceptions) probably did more to harm the label's reputation than all others combined. Actually, the Pat Benatar and Gerry Rafferty Front Row discs sound GREAT in DVD~A stereo. At least they're true hi res.
Those were King Biscuit Flow Hour shows, not the best ones either. But I am wondering is any Silverlines of KBFH had SQ encoding intact.