Low-bit-rate audio

jeremyk wrote on 8/25/2004, 9:11 AM

I'm contemplating putting a "director's commentary" alternate audio track on a long DVD, so I'd like to use the 96Kbps setting for the AC3 track to save space. The quality is quite adequate for voice.

DVDA warns that my audio track is a non-standard. I made a test disc, and it plays fine in my recent-vintage Panasonic player. Has anyone seen a player not work with a 96Kbps AC3 audio track?

Comments

bStro wrote on 8/30/2004, 8:55 AM

DVDA warns that my audio track is a non-standard. I made a test disc, and it plays fine in my recent-vintage Panasonic player.

I don't have an answer, but if you made that test disc with DVDA, it probably re-encoded the audio. When DVDA complains that something is non-standard, it either refuses to go further or it makes it standard.

Rob

jeremyk wrote on 8/30/2004, 9:16 AM

...if you made that test disc with DVDA, it probably re-encoded the audio.

Good point, thanks, Rob. I can experiment with this, and see what's actually going on.

Jeremy

bStro wrote on 8/30/2004, 3:25 PM

Here's something curious...I tried to duplicate your issue. I opened up a project of mine, rendered the audio to AC3 (changing the data rate to 96, leaving everything else the same), and brought it into DVDA.

Vegas warned me before the render, but DVDA didn't make a peep when I Optmized nor when I tried to Prepare.

Are you using V4+DVD2? Did you change anything else...maybe the sample rate?

Rob

rontvs wrote on 8/30/2004, 5:13 PM

I have wondered about this also because the DVDA manual indicates that bitrates from 64Kbps to 448Kbps are acceptable for AC-3 audio and you would think DVD compliant as well.

Ron