Date: Fri, 14 Feb 2003 13:41:08 +0100 (MET) From: Peter B <pb@ludd.luth.se> To: freebsd-multimedia@freebsd.org Subject: Bt878 & whitenoise (some observations..) Message-ID: <200302141241.h1ECf8X04143@brother.ludd.luth.se>
next in thread | raw e-mail | index | archive | help
I use FreeBSD-4.7 on a motherboard Asus A7V333 with cpu AMD XP1800,
Brooktree 878 card. The lineout of the Bt878 is connected to CD input of the
motherboard (aux not supported in freebsd4.7?). Programs used is fxtv + ffmpeg.
I'm experiencing heavy white noise added to recordings done with the builtin
CMedia CMI8738 soundchip. However it only occours on certain TV channels and
won't affect the lineout of the Bt878 (no noise on the stereo).
And can sometimes come and go by restarting fxtv.. :)
The fenomen is present even if I freeze the picture in fxtv, and use an
audio only record program.
Anyway I did a table with the fxtv channel number + noise presence. And used
fxtv to tune channel, exit. Start ffmpeg to record. As can be seen channels
with a low frequency is more likely to be affected.
5 Noise
6 Noise
7 ? (will know in aprox 3 hours, no transmission)
8 Ok
9 Ok
10 Noise
11 Ok
12 Ok
90 Ok
91 Ok
92 Ok
93 Ok
Anyone know about any interference issues regarding this?
Or maybe there is a bug in the CMI8738 hw/sw ..?
/P
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-multimedia" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200302141241.h1ECf8X04143>