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Hydrogenaudio Forums > CD-R and Audio Hardware > CD Hardware/Software
yandexx
Hello.

How to make a perfect Audio CD from a lossy source?

One issue is about dithering. As far as I know, dithering is used to compensate for errors when downsampling BPS, like in 24 -> 16. Since modern lossy codecs all store floating point data, and CDDA is 16 bits, it needs downsampling, right? So, must I apply dithering here?

Let's talk foobar2000 terms here, as I find it being a very good program for writing Audio CDs. Audition may be good too.

Another issue is about clipping, which always occurs with loud albums on lossy encoding. What should I do to avoid it? Should I use Replaygain in Album mode w/o applying gain but w/ avoiding clipping according to peak, or should I rather use Advanced Limiter DSP? The first choice seems better, because changing gain won't affect the audio data much, since it's floating point. But using Limiter would keep the volume while preventing clipping.

Please tell me the answers.

foobar2000 is awesome. What other program allows you to use Replaygain, dithering and DSP for burning CDs? Nero only has normalize function, and who would use that? And why do many programs (at least Audition, Cubase SX) treat MP3 as 16-bit data?
krabapple
QUOTE (yandexx @ Aug 18 2006, 11:33) *
Hello.

How to make a perfect Audio CD from a lossy source?



Convert it to .wav (foobar2k can do this easily). Burn it to CD. Done. If you are still suspicious, run an ABX to see if you can tell the diff between the .wav file and the original MP3. Let us know how that turns out.
jarsonic
QUOTE (yandexx @ Aug 18 2006, 11:33) *
Hello.

How to make a perfect Audio CD from a lossy source?


Well, if its a lossy source, then it won't be a "perfect" one to one copy of the original, but I'm sure you know that. smile.gif

QUOTE (yandexx @ Aug 18 2006, 11:33) *
One issue is about dithering. As far as I know, dithering is used to compensate for errors when downsampling BPS, like in 24 -> 16. Since modern lossy codecs all store floating point data, and CDDA is 16 bits, it needs downsampling, right? So, must I apply dithering here?


Dithering is always a good idea when you're burning from a lossy source.

QUOTE (yandexx @ Aug 18 2006, 11:33) *
Another issue is about clipping, which always occurs with loud albums on lossy encoding. What should I do to avoid it? Should I use Replaygain in Album mode w/o applying gain but w/ avoiding clipping according to peak, or should I rather use Advanced Limiter DSP? The first choice seems better, because changing gain won't affect the audio data much, since it's floating point. But using Limiter would keep the volume while preventing clipping.


Use ReplayGain in album mode. If you are burning a mix cd from multiple source cds, you should use the track gain mode.
greynol
QUOTE (jarsonic @ Aug 18 2006, 10:39) *
Use ReplayGain in album mode. If you are burning a mix cd from multiple source cds, you should use the track gain mode.

If you're including a quiet track in your mix cd that you'd like to keep quiet you're probably better off still using album mode.
yandexx
Thanks, jarsonic! You made all my doubts go away.

QUOTE
Convert it to .wav (foobar2k can do this easily). Burn it to CD. Done. If you are still suspicious, run an ABX to see if you can tell the diff between the .wav file and the original MP3. Let us know how that turns out.

krabapple, thanks, but I use foo_burninate for this (although it does the same thing). And I was curious whether to apply dithering or not as well as RG.
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