AC3 files for DVD and Blu-ray different??

plekkie wrote on 11/10/2008, 2:23 PM
I want to output one project to both DVD and Blu-ray. To do that I have prepared DVD and Blu-ray compliant video files, and ac3 stereo audio files.

Output to DVD is OK: all video and audio files are compliant with disc format, only rendering for menus due to composited graphics.

After replacing the video files, output to Blu-ray is showing compliant video files (1920x1080 50i, 25 Mbps MPEG2), but the ac3 stereo files (256 kbps, 48 kHz) that were compliant for DVD, are not compliant with Blu-ray?? DVDA states that it is "required" to recompress these files, because they are not compliant with the disc format. And DVDA is indeed re-rendering them. The total disc size is far below the targeted disc size, so that can not be the reason.

What is different to compliant ac3 files for DVD and Blu-ray?

NB: There is no change after updating to 5.0a

Comments

John_Cline wrote on 11/10/2008, 2:30 PM
Are you using the AC3 Pro or AC3 Studio codec to render your AC3 files from Vegas? According to a recent post in the Vegas forum from the Forum Administrator, Blu-ray requires the AC3 Pro codec to be used.
ECB wrote on 11/10/2008, 2:33 PM
Blu-ray requires the audio stream be ac-3 Pro. See the FroumAdmin post in http://www.sonycreativesoftware.com/forums/ShowMessage.asp?ForumID=4&MessageID=623169

Ed B
plekkie wrote on 11/10/2008, 2:37 PM
I have rendered all files using Canopus Edius Pro 5, so it seems these ac3 files are not blu-ray compliant.

I could of course export the audio files from Edius to .wav, and let DVDA do the conversion to .ac3. If there is a difference in "acceptance" of .ac3 files for DVD and Blu-ray projects, that is probably the safest solution.

Thank you for your very fast reply!