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Topic: Testing Codecs Blind Test ? (Read 2347 times) previous topic - next topic
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Testing Codecs Blind Test ?

Hello everyone !

I'm looking for software to compare codecs or to analyse audio (before and after compression graph) , i currently use paz plug in sound forge, but it's not for encoding audio.

I know there must be something out there to do that,

i'm also looking for a bit of explanation on ms stereo , mid side stereo (in joint stereo)

when lame switch to js is it giving you less phase ?  or separation ?  when is use -md it's giving me more phase . Well when i encode loud music with high transient  (i.e nin things falling appart)







my settings for NIN things falling apart - truly transparent to me 

--freeformat -b560 -h -md -k --athtype 2 -Z -p

sickamongthepure
Audio's Future Engineers

Testing Codecs Blind Test ?

Reply #1 –
The best thing to compare codecs should be your ears - i mean you should do listening tests because your own ears are the only true indicator for (subjective) quality. And isn't audio compression all about subjective quality in music? Here a link for informationen on  Mid Side Stereo. Edit: ff123's HP for information on blind listening tests

greets
David

Testing Codecs Blind Test ?

Reply #2 –
Quote
I'm looking for software to compare codecs or to analyse audio (before and after compression graph) , i currently use paz plug in sound forge, but it's not for encoding audio.


The problem is that graphs don't tell you how it sounds.  Degredation you see in a graph doesn't always correlate with what you actually hear when listening to the file because with these graphs you cannot take into account psychoacoustic effects.

Quote
i'm also looking for a bit of explanation on ms stereo , mid side stereo (in joint stereo)

when lame switch to js is it giving you less phase ?  or separation ?  when is use -md it's giving me more phase.


Joint stereo doesn't exactly work that way.  It's not meant to degrade the stereo image implicitly, instead it uses a bit of a "short-cut" in terms of representing redundancy in the stereo field in a more efficient manner.  That's obviously a gross overgeneralization and not entirely accurate, but to explain it fully would take a lot more text than that.  If you're really interested in how it works, you could probably find more information on it at Gabriel's site at mp3-tech.org.

Quote
my settings for NIN things falling apart - truly transparent to me  ;)

--freeformat -b560 -h -md -k --athtype 2 -Z -p


Just a few things.  --athtype 2 should be defaulted on that command line, so it's unnecessary.  Also, -Z will probably do the opposite of what you are thinking there.  -Z does something different when it is not used with the --alt-presets.  It's not an on and off switch like most people think, it's a toggle switch.  The setting it's toggling is set different with the --alt-presets than with the command line you are using, and if you're are looking for more accuracy (less agressive noise shaping), then you don't want to use -Z in your case.

And finally, if you're already giving up compatibility with portable players and most other software by using such high bitrate freeformat, you'd do much better to use a format like MPC.  You'd be able to get higher quality than what you'll get from you current command line at a far lower bitrate.  For example, no matter how high the bitrate, MP3 has certain problems which cannot be overcome like too long of a short block to prevent pre-echo, etc..