Re: [gentoo-amd64] Re: libmad sound artifacts

[Canek Peláez Valdés]

On Wed, Mar 26, 2008 at 8:22 PM, Duncan <1i5t5.duncan@×××.net> wrote:

[...]

>  The strong indication is therefore that the problem isn't in the
>  processing per se, but that the libmad processing is either too CPU
>  intensive for your system config in real-time, or that it's defaulting to
>  an incompatible sampling rate for your system and/or soundcard, and
>  sending it to wav first uses a different process and/or sample rate.

I don't think the processor is the culprit; I have an AMD 64 X2 3800+,
and I know it no longer is the fastest thing around, but still. The
sample rate is a possibility, though, but then again why it worked
before and not now?

>  From what you said, it /used/ to work fine.  Assuming that's the case,
>  the problem may not be with libmad at all, but with recent kernel changes
>  and/or latency or priority changes on your system.  It's a pretty big
>  field of possibilities to try to narrow down from, IOW.

I upgrade to stable gentoo-sources when they come out, but the latency
and priority options in my kernel are the same. Besides, nice -n -20
madplay doesn't solves the problem.

>  Or, it could be the sampling rate, as I mentioned.  I don't know, does
>  libmad allow fiddling with that?  When was your latest upgrade and does
>  the changelog mention anything about new sampling defaults or the like?
>  (FWIW, here I'm no libmad-0.15.1b-r4, with the dates on the files
>  suggesting I last merged it on March 17, which would have been the emerge
>  -e world after I upgraded to gcc-4.3.0.  I am however on ~amd64 with gcc
>  and binutils always unmasked to the absolute latest in-tree regardless of
>  keywording, and always emerge --upgrade --deep.  If you are on stable and/
>  or don't regularly use --deep, you may have an earlier version; epkginfo
>  says -r2 is latest stable, but 0.15.1b is going to be the latest upstream
>  release.)

I upgrade every week, deep and newuse. Before the problem, the last
update for libmad was in August of 2007. And all the reviews in the
ebuilds change only cflags and configure options, and I have tried all
of them.

>  One thing to note is that libmad isn't the only mp3 decoder available.

I know; but I try to use GNOME, and I **really** like Rhythmbox and
Totem. That means using GStreamer, which uses MAD as MP3 decoder. I
can hear my music with mpg123, but that's besides the point: I want to
fix the problem, not work around it.

Thanks anyway.
-- 
Canek Peláez Valdés
Facultad de Ciencias, UNAM
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