Date: Fri, 21 Sep 2001 12:02:08 +0200 From: Rahul Siddharthan <Rahul.Siddharthan@lpt.ens.fr> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: Bjarne Wichmann Petersen <mekanix@privat.dk>, freebsd-multimedia@FreeBSD.ORG Subject: Re: Choosing a soundcard. Message-ID: <20010921120208.C42208@lpt.ens.fr> In-Reply-To: <XFMail.20010921121243.doconnor@gsoft.com.au>; from doconnor@gsoft.com.au on Fri, Sep 21, 2001 at 12:12:43PM %2B0930 References: <20010920153041.QSJQ2356.fepF.post.tele.dk@there> <XFMail.20010921121243.doconnor@gsoft.com.au>
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Daniel O'Connor said on Sep 21, 2001 at 12:12:43: > > On 20-Sep-2001 Bjarne Wichmann Petersen wrote: > > But playing DVD's (vlc etc.) a few mp3's and some games I get > > this scratchy, electric sound like some bad wiring or something. > > I can't figure out whether it's the soundcard or some bad > > decoding going on? Is SB PCI128 suited for movies and such? > > I think there is a bug in the pcm driver to do with sample rate > conversion. > > I get the effect you describe in mplayer when playing 48kHz sound > tracks unless I force it to play at 44.1kHz. Yes, I have the opposite problem: my sound card accepts only 48000 Hz and the pcm driver's upsampling of 44100 Hz sound doesn't seem satisfactory. It's not a scratchy electrical sound though, just a slight distortion more audible in some kinds of music than in others. On the other hand, if I try to record from the mic at a frequency lower than 48000 Hz, I do get a noise exactly like what you describe (a scratchy electrical sound). Earlier on this list I was told the distortion may be an issue with the driver for my card (VIA VT82C686A) but quite definitely it's an issue with the upsampling, so maybe it affects other cards too. I get around it by playing all my sound through KDE's aRts, which seems to do the upsampling correctly. But there are other issues with using aRts on FreeBSD, and besides, not all non-KDE software supports it (xmms and ogg123 do, though). I haven't tried mplayer. - Rahul To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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