Originally Posted by benes
I've tried quashing this myth every time it comes up but it just won't die.
I've authored many discs with Scenarist BD which is a $50k professional authoring package used to make some of the discs you buy in stores. One of the steps in the authoring process is a compliancy check where it scans the entire file to make sure it fits the Blu-ray spec. Every single Universal HDDVD VC-1 encode I've tried passes this check. Including things like King Kong which was given as a specific example for that B-frame myth a long time ago.
From my experience I wholeheartedly agree.. (It only makes sense that software is written for the common ground) BUT.. I have also seen a lot of encodes that differ by 1 or 2 seconds with, seemingly, no difference in content. (24fps stuff not related to PAL speedup problems)
That could throw out the synch with the audio when mixing HDDVD video with BD audio.
If it's just an x ms offset you can apply to the audio stream then great, but often things start off in synch and then fall out of synch along the way.
Of course you can't compare the 2 video streams frame by frame, so it's fingers crossed when mixing one soundtrack with another video track.