Dolby 2.0.ac3 VERSUS AIFF? What are the merits of each?which is better?

Like the title says really... Which out of the Dolby 2.0.ac3 codec or the AIFF codec is better? I'm authoring a few DVD's and have had a few comments back saying that they can only hear one audio channel, I have been using just the Dolby codec in my DVD. Is it used for surround sound? is there one that I shouldn't use? Is one of them not widely used by DVD players or computers wanting to play them?
Any explantions of these two file types would be brilliant.
Thanks

Hey overcast
sorry for the delayed response, since you see everyone always say "use .ac3 over .aif), but sometimes the "why" is a little unclear, and a lot of times, it's just "use it bcz it's better".
as far as which is better, both have advantages and disadvantages.
for example:
f you want more technical info, let me kone of the biggest advantages of Dolby Digital (.ac3) is that it's the defacto choice for audio on DVD and a lot of broadcasaters, since this is the only codec that keeps (for the most part) the audio elements original fidelity at the lowest possible bit-rate from all video codecs currently out. one drawback is that the waveform has a stricter ceiling and floor, ie the loss of fidelity.
you would need professional decoders, verifiers and bit-stream analyzers to truly see the difference, but can you hear it, only the most attuned ear in optimal conditions can hear a difference (of course IMHO).
however, lossless apple audio (.aif) (believe me, still compressed, but with a small ratio) is almost as good and uncompressed (.pcm) audio and retains way more fidelity and a comparable bit-rate to that of the uncompressed audio. the range of the waveform is almost identical to that of raw audio.
an additional note for .aif is that it's bit-rate is almost identical to that of uncompressed audio, so it takes up more bandwith, but once again, the sound is "richer" therefore this is personally my codec choice when authoring music DVD's where i have stereo (again, IMHO).
i guess thats the meat of it. if you need more information, let me know.
Mikey M.

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