VC-1 sounds right. Warner supported both BD and HD-DVD and both formats could use VC-1, which allowed Warner to make one home video master that could be used on both. But HD-DVD had significantly less capacity than BD, so any title prepped for both formats was capped at HD-DVD’s limitations. For...
The original camera negative wasn’t the master for the finished movie; the master was completed as a 2K DI, as was typical for a movie made in this particular time period. The overwhelming likelihood is that it will be sourced from the completed 2K DI. It should still represent an improvement...