What is the lowest valid AC3 bitrate

[numlock]

I'm making a DVD and I need to reduce audio (AC-3) bitrate as low as possible. I need to know what's the lowest I can go and still be able to play it on many standalons DVD players. THis DVD will be destributed to thousands of people, so there is no way I can test it in advance on so many different players. I'm thinking of going as low as 56 KBits/s. Is this going to be acceptable ?

[The Edge]

From Besweet:
32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 448, 512, 576, 640 KBits/s

Personally I wouldn't go below 160 2Ch

I guess you just got to experiment with different bitrates.

Edge

[Awatef]

Here: http://www.dvddemystified.com/dvdfaq.html#3.6.2
64k or higher

But why would you take less than 96k for Dolby Digital 1.0? the 32k difference won't have any visual video impact, but will improve audio quality greatly.

[oddyseus]

I found the hard way that Maestro won't accept an ac3 file if it was encoded below 192kbs (a 2.0 file actually). That is 96kbs per channel.

[numlock]

Thanks for the replies. I'll go for Dolby Digital 1.0 @ 96 kBs then.
One more question, what's the difference between Dolby Digital 1.0 and Dolby Digital 2.0 ? IS it mono and stereo ? How do I tell BeSweet to encode it to Dolby Digital 1.0 and not Dolby Digital 2.0 ?

[Awatef]

Dolby 1.0 = mono
Dolby 2.0 = dual-mono or stereo or surround-pro-logic

[alexnoe]

The spec file clearly says that 32 kbps is possible. However, I don't know if there is any additional limit for dvd-video