Ripping high res from DVD-A, it's easy now
Dec 15, 2008 at 4:15 PM Post #16 of 40
Nice!
Just got hold of the Mac OS X version...
smile.gif
 
Feb 13, 2009 at 2:13 AM Post #17 of 40
Hey, I just thought I'd bump this topic. After ripping some 5.1 MLP files from a DVD-a, how can I downmix them to stereo wav files?

Is there a real difference in sound quality between the stereo PCM and the 5.1 mixes on these CDs?

edit - I just figured out that Audacity can downmix the 5.1 Wav files to 2.0 wav files.
Holy crap, this sounds incredible.
 
Feb 16, 2009 at 3:42 AM Post #18 of 40
Quote:

Originally Posted by Dublo7 /img/forum/go_quote.gif
Hey, I just thought I'd bump this topic. After ripping some 5.1 MLP files from a DVD-a, how can I downmix them to stereo wav files?

Is there a real difference in sound quality between the stereo PCM and the 5.1 mixes on these CDs?

edit - I just figured out that Audacity can downmix the 5.1 Wav files to 2.0 wav files.
Holy crap, this sounds incredible.


Your best option would be to rip the stereo mix from the DVD-A. Which disc was it? I know at least one disc that doesn't have stereo high res, only 5.1.
 
Feb 16, 2009 at 3:58 AM Post #19 of 40
works great ...easy to figure out (just use the L-R channel section) as that's for stereo 24/96 and the other section are for 5.1. 24/96 rips sound great.
 
Feb 16, 2009 at 7:08 AM Post #20 of 40
Quote:

Originally Posted by mcmurray /img/forum/go_quote.gif
Your best option would be to rip the stereo mix from the DVD-A. Which disc was it? I know at least one disc that doesn't have stereo high res, only 5.1.


It was the Porcupine Tree Lightbulb Sun DVD-A. I ended up ripping both, and the downmixed 5.1 to stereo version sounds infinitely better than the 24 bit stereo mix.

Now I'm just waiting for my Deadwing DVD-A to arrive in the mail...
 
Feb 17, 2009 at 4:31 AM Post #22 of 40
Quote:

Originally Posted by Dublo7 /img/forum/go_quote.gif
edit - I just figured out that Audacity can downmix the 5.1 Wav files to 2.0 wav files.
Holy crap, this sounds incredible.


How did you do that exactly? I tried to export a 5.1 WAV to FLAC. It said it was going to downmix but all I got was silence.
 
Feb 17, 2009 at 7:06 AM Post #23 of 40
Quote:

Originally Posted by bungle /img/forum/go_quote.gif
How did you do that exactly? I tried to export a 5.1 WAV to FLAC. It said it was going to downmix but all I got was silence.


1) Open the 5.1 Wav in Audacity.
2) Export as Wav (this will downmix to stereo)
3) Convert the stereo Wav to FLAC using whatever program (I use dbPowerAmp)

beerchug.gif
 
Feb 17, 2009 at 2:28 PM Post #24 of 40
Huh, going right to WAV worked. I guess Audacity didn't do the conversion to FLAC correctly. Now I just have to figure out why it thinks the whole thing is only 27 minutes (instead of 150). The file is 4.9G, so I think it is all there. Perhaps there's an error in the middle. The downmix is a also little louder and has some clipping - I think I'll have to adjust the levels before mixing next time.

I'm on Linux, so I used MPlayer to get the audio like this:
mplayer dvd://1 -ao pcm:fast:file=blah.wav -aid 129 -channels 6 -vo null -vc null

Anyone else succesfully use MPlayer like this?
 
Feb 17, 2009 at 3:19 PM Post #25 of 40
DVDAExplorer 2008.04.16 (Beta 1) can downmix multichannel to stereo. I know there was one person on Hydrogenaudio who said there was a problem with that feature in that it added noise. But I haven't seen anyone confirm that bug report.

Is the jury still out on the downmix feature?

--Jerome
 
Feb 17, 2009 at 4:05 PM Post #27 of 40
Quote:

Originally Posted by jsaliga /img/forum/go_quote.gif
DVDAExplorer 2008.04.16 (Beta 1) can downmix multichannel to stereo. I know there was one person on Hydrogenaudio who said there was a problem with that feature in that it added noise. But I haven't seen anyone confirm that bug report.

Is the jury still out on the downmix feature?

--Jerome


I will give it a try tomorrow and post my findings.
 
Feb 17, 2009 at 11:31 PM Post #28 of 40
Ok, I'll never use Audacity to downmix again. It mixes the file way too loud, and creates clipping.

I've discovered a much, much better program. The program is called Eac3to and More GUI. Do a google search and check it out.
When you downmix a file, it detects if there will be clipping, and it lowers the mixing volume. Now Deadwing (which clipped quite a lot), now sounds absolutely perfect.

I tried to use the Downmix feature on DVD Audio Explorer, but it only works for a few DVD-A.s
 
Feb 17, 2009 at 11:48 PM Post #29 of 40
I suspect that the levels could be adjusted in Audacity before the downmix so there's no clipping. I'll try it sometime. I'd like a solution, since I only use Linux at home.
 
Feb 18, 2009 at 12:48 AM Post #30 of 40
Quote:

Originally Posted by paulw86 /img/forum/go_quote.gif
Exactly how good quality is DVD-A?
Is it DVD-A > SACD > CD?


DVD-A > CD.

It's debatable where SACD fits in the above expression because the encoding process is very different and you can hear it imho.

DVD-A handles 24bit audio - the same quality which is used in digital recording studios and is now found on some (all?) blu ray movies.
 
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