Subject: Re: [ecasound] Real Encoder
From: George Motter (gfm2_AT_lehigh.edu)
Date: Mon Dec 17 2001 - 17:15:11 EET
Thanks for the response. I looked at the ALSA site again and will post
a message over there.
I have used -eca, but I had problems with the fact that it pushes the
overall gain down post compression and I then needed to gain it back
up. Getting the correct gain increase without clipping was tricky.
I just started playing with the compressor in LADSPA CMT and it's not as
good but I don't have to ride the output gain. Could be that I just
did not get the -eca settings right.
A real leveler would be fantastic and probably not that hard to do based
on the same feedback that a compressor works from. If you try and set
up the compressor as a leveler, you have to push the high gain audio
down so far, that it really affects it's fidelity.
If I wasn't primarily a perl coder I would give it a shot.
Kai Vehmanen wrote:
> On Sat, 15 Dec 2001, George Motter wrote:
> > pipe and send it both to Real and Lame. Real can take input from
> > /dev/dsp. Is there a virtual /dev/dsp that I can feed into and then
> > route it back to Real? Sort of like a software wire from the line out
> > back to the line in.....
> At least in theory you could use ALSA-0.9x to do this. You'd need to run
> RealEncoder under ALSA's OSS-emulation (and specifically emulation through
> libaoss -> 'LD_PRELOAD=/path/to/libaoss.so realencoder'). Then you could
> use's ALSA's pcm-plugins to make a link between ecasound's output and
> realencoder's /dev/dsp input.
> But the problem is that nobody but the ALSA developers seem to know how to
> use the pcm-plugins, and they are too busy to write any documentation. But
> sooner or later someone will have to find out. ;) You should ask about
> this on alsa-users (or possibly also alsa-devel) mailing lists.
> > Has anyone though of writing a leveling plugin? Especially to
> > dynamically gain up low sections and songs.
> Would be a good addition, but so far nobody has written one. Currently
> -eca (the advanced compressor) is the best choice. It's very good for
> level control, but fine-tuning the parameters is tricky.
> Audio software for Linux!
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George F. Motter V Senior Systems Specialist Lehigh University Information Resources 401 Linderman Library 30 University Drive Bethlehem, PA 18015 (610) 758-6149 fax (610) 758-5605 george.motter_AT_lehigh.edu -- To unsubscribe send message 'unsubscribe' in the body of the message to <ecasound-list-request_AT_wakkanet.fi>.
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