On Thu, 21 Dec 2006 17:44:55 +0100Sebastian Schäfer <schaefer@xxxxxxx> wrote:
> Hi!> > After I finally switched from that CMI3738 card to Intel HD Audio (a> SigmaTel chip) I have another quite interesting problem:> > As the bass of the Intel HDA is a bit weak, I tried applying a LADSPA> equalizer filter on it. After I spent most of the day to get that> working I now have a problem:> > When playing a wave file (stereo) with aplay --> equalizer works> absolutely fine.> > When playing a movie with 5.1 sound using mplayer --> sound is> crackling, like it can't be played fast enough, or like when you ffwd> through a dvd. Something like that.> > When playing the mentioned wave file with mplayer --> equalizer works> fine.> > Is this ALSA's way to tell me that using that equalizer is not a good> idea, or am I doing something wrong?> > My asound.conf looks like this:> ----> pcm.ladspa {> type ladspa> slave.pcm "plughw:0,0";> path "/usr/lib/ladspa";> channels 6> plugins> [> {> label dj_eq> id 1901> filename "/usr/lib/ladspa/dj_eq_1901.so"> input {> controls [ 0 0 0 ]> }> }> ]> }> > pcm.!default {> type plug> slave.pcm "ladspa";> }> > pcm.!surround51 {> type plug> slave.pcm "ladspa";> }> ----> > The same thing happens when I use another plugin out of Steve Hariss'> collection (tried with vynil).> My worst fear is, that I have done nothing wrong and these plug-ins are> simply not capable of coping with multichannel audio. But why are the> additional 4 channels not just discarded, but the sound completely> distorted?> > Thanks in advance for any help,> Best wishes and a merry christmas to you all!> Sebastian Schäfer> > > -------------------------------------------------------------------------> Take Surveys. Earn Cash. Influence the Future of IT> Join SourceForge.net's Techsay panel and you'll get the chance to share your> opinions on IT & business topics through brief surveys - and earn cash> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV> _______________________________________________> Alsa-user mailing list> Alsa-user@xxxxxxxxxxxxxxxxxxxxx> https://lists.sourceforge.net/lists/listinfo/alsa-user
For starters, do not boost bass, rather, suppress all the rest- remember, you have limited number of bits to represent sound,thus you should never have overflows.
Boosting something directly can cause overflows, boosting throughsuppressing the rest can not (more or less).
--Sergei.
-- Visit my http://appsfromscratch.berlios.de/ open source project.
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