Le 01/12/2011 19:24, David Baelde a écrit :
> Hi guys,
>
> I listened to the two files. Sometimes I feel like I can hear some
> artifacts, but it's really slight; I'm not sure I could tell them
> apart in a blind test. Anyway, I'm no expert in hearing compression
> artifacts.
I'm no expert either, but I have good hears (I don't say you haven't ;)
) and I can tell for sure the sound is affected, much more as it should
be for this bitrate.
But see below I have done more tests.
>
> I'm not sure where to go from here. It would be interesting to check
> what parameters really end up being passed to liblame with the two
> tools. Sometimes, an interface might do some adjustment on parameters
> to make things sound better.
>
> Otherwise, if you don't want to dig into the source code of audacity
> (for liquidsoap, you can ask us the details) you can just try to raise
> a little bit the quality settings.
>
The thing is, even exporting with lame parameter -q9 ("Disables almost
all algorithms including psy-model. Poor quality."), I can't get it as
worse as the LS's one.
I would like to find a parameter in lame that would reproduce the noise
I can hear, but I can't find one to make it worse :D
More seriously, I done some more testing. I tested a compress to
96Kbit/s and compared it with the 128Kbit/s from liquidsoap. The
conclusion is the artefacts I hear in the 96k one is for sure not the
kind of the artefacts/noise in LS one.
the 96k bitrate raise some "birdies" in the sound when the LS file get
some "noise"/tremolo in low frequencies. HF are not so much affected.
For me, there is little chance that this quality issue to be related to
libmp3lame. So the question would be, may LS apply some kind of
processing on the file before or after the encoding step ?
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