Hi Jurgen I hope you're having luck with your documentary, I hope I can be of help with this information.
I used a customized Blu-ray data rate calculator I wrote up for my company at New Element Productions (Los Angeles). If your film is 145 minutes, to make it fit on a single layer BD 25, encoding at 28,939 data rate will give you the best quality and fit, leaving room for a few still menus or short logos. Your film will look great doing a 2 pass encode with a high quality encoder such as with one we have here. If you want the best quality however encode at 40,761 but that will be for a dual layer BD 50. This is all considering you have maybe 1 or 2 short logos and .ac3 compressed audio, and not a lot of features on the disc. If you do, another calculation will need to be made for the film and all other assets to ensure the highest quality for the disc space available. Also I suggest using VC-! encoder instead of Mpeg2, as it offers superior quality, we use that here at my company as well.
If you want a professional studio quality and functional disc with no errors, you can view my portfolio of over 25 BD Blu-ray titles replicated with no mistakes. We have also authored hundreds of SD titles. We work with clients across the globe in many languages if needed.
http://www.newelementproductions.com
Have a great day Jurgen and I wish you the best with your film.
Feel free to contact me directly at newelementproductions@yahoo.com or call me at the phone number listed on my website, thanks.
Clint Nitkiewicz Hernandez
www.newelementproductions.com
Film-Maker/ Cinematographer/ Visual FX Supervisor/ Editor/ Blu-ray Author/...
