Date: Sun, 1 Feb 1998 08:52:41 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: durham@w2xo.pgh.pa.us (Jim Durham) Cc: freebsd-multimedia@FreeBSD.ORG Subject: Re: General notes about sound recording on FreeBSD 3.0. Message-ID: <199802010752.IAA03096@labinfo.iet.unipi.it> In-Reply-To: <XFMail.980131181225.durham@w2xo.pgh.pa.us> from "Jim Durham" at Jan 31, 98 06:12:06 pm
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> Since there was a recent thread on doing sound recording > on FreeBSD, I thought I'd report on what I've been doing > here and results thereof. ... > However, at 44100 khz scan rate, small "ticks" appear in > when the sound level is fairly loud. These are almost > undetectable, but, once you notice them, they're really > annoying. Sort of like someone ticking the edge of a piece > of paper in the background of the recording. A test I made > with silence followed by a loud sound produced a "tick" > right *before* the sound. I don't know what this might mean. no idea either... > This is while using a kernel with the Voxware driver. > > I decided to try Luigi's driver to see if results were > similar, but can't get it to work on 3.0-SNAP-971225. > (Locks up entire system after delivering short burst > of sound). I was hoping that perhaps this might be a cure. 8-(. I think SB16 operation with my driver in 3.0 might be partially broken (it is not supposed to lock up the system, though!). I suggest to upgrade to my latest code at http://www.iet.unipi.it/~luigi/FreeBSD.html where I fixed the SB recording problem. > Finally, the RealAudio 3.0 encoder will core-dump immediately when > you try to use the line or mic input to record a RealAudio file > to disk. If you first make a raw audio file, then encode that, it > works fine. I've mentioned this before and reported it to RealAudio. I had the same problem. Maybe that's because you have the demo/free version of the encoder which does not work with streams ? Unfortunately the trick of redirecting stdin does not work. cheers luigi -----------------------------+-------------------------------------- Luigi Rizzo | Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it | Universita' di Pisa tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/ _____________________________|______________________________________
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