OK, my friends, here are answers to YOUR questions:
Don, for a 1 hour, 58 minute video (with only 3 minutes of audio, even though I encoded a complete AC-3 audio track) for an SS/SL DVD with no menus at 1% safety margin, the bitrate calculator shows Minimum 2984, Avg 4984, Max 8720. I actually used 3088, 4900 and 8500. While high on the low end (which it will never get this low), I was a bit conservative on the middle and high figures.
George, my bad! I meant so say 1 GB! Actually the AC-3 audio file compressed to 166.3 megs, FYI. I am curious, though, if I need to use 2-pass VBR to get closer to the AVG bitrate calculated, for I have seen my similar encodes actually are at around the Max bitrate, which could cause these excess file sizes, no?
Mike, please DO let us know what you find out with your three tests at different safety margins.
Perhaps we can come up with the best combination of bitrates (also taking into account safety margins) to use, but don’t you all agree that the bitrate calculator appears to be way off if my file sizes so exceeded 4.7GB? Perhaps I just should stick to 6Mbs CBR for these film transfers and 2-Pass VBR for videos that I have shot (if the latter will compress at more accurate rates based upon the bitrate calculator)?
Any more suggestions would be helpful based upon YOUR actual experiences (since I still am relatively new at calculating bitrates for DVDs and rendering as such), and I await Mike’s results with th hope that he stumbles upon something, too!
Rich Kutnick
VIDEO IMPRESSIONS