From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id m4RDnARV026252 for ; Tue, 27 May 2008 09:49:10 -0400 Received: from mail.gmx.net (mail.gmx.net [213.165.64.20]) by mx3.redhat.com (8.13.8/8.13.8) with SMTP id m4RDmtdv002988 for ; Tue, 27 May 2008 09:48:55 -0400 Date: Tue, 27 May 2008 15:48:48 +0200 From: Steve S To: video4linux-list@redhat.com Message-ID: <20080527134848.GA3048@ramrod.de> References: <20080523111709.GA4796@ramrod.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080523111709.GA4796@ramrod.de> Subject: Re: cx88: white noise with audio cable; no sound with cx88-alsa List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: video4linux-list-bounces@redhat.com Errors-To: video4linux-list-bounces@redhat.com List-ID: On May 23 13:17, Steve S wrote: [...] > I have a WinTV PCI card with a cx88 chip. > > -------------------------------------------- > 00:0f.0 Multimedia video controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder (rev 03) > 00:0f.1 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder [Audio Port] (rev 03) > > -------------------------------------------- > $ cat /proc/asound/cards > 0 [V8235 ]: VIA8233 - VIA 8235 > VIA 8235 with ALC650E at 0xe000, irq 19 > 1 [CX8811 ]: CX88x - Conexant CX8811 > Conexant CX8811 at 0xd2000000 > > -------------------------------------------- > /etc/asound.names: > > ctl { > alsactl1 { > name hw:0 > comment 'Physical Device - VIA 8235 with ALC650E at 0xe000, irq 19' > } > alsactl2 { > name hw:1 > comment 'Physical Device - Conexant CX8811 at 0xd2000000' > } > } > [...] > > -------------------------------------------- > > I have 2 issues: > > 1) Right now, I'm capturing the sound using the analog audio cable that's > plugged into my onboard soundcard line-in (the VIA chip). At boot, I hear white > (static) noise coming from the line out of the TV card. If I start my TV app > (tvtime), the noise is replaced by the normal TV sound. When I close the TV > app, the noise is gone. > > 2) After a lot of searching the net, I was not able to track this issue down. > So I thought I try to capture the sound in another way. According to [1,2], I > should be also able to capture the sound via the cx88-alsa module. The only > difference seems to be that I have rev 3, not rev 5. I've read a lot about > redirecting the sound from the TV card but I feel a bit lost here. I tried > > $ sox -c 2 -t alsa hw:1 -t alsa hw:0 > $ arecord -D hw:1 -c 2 -r 48000 -f S16_LE -t wav | aplay - > > They all play nothing but silence. So, is this even possible with my card? update: I was able to capture the TV sound with cx88-alsa using mplayer like so: $ mplayer tv:// -tv driver=v4l2:alsa:adevice=hw.1:amode=1:audiorate=48000:volume=100:immediatemode=0:norm=PAL-BG:mjpeg So, my card can do that. I still haven't found out why the other two possibilities above don't work, though. Also, I read that these solutions can cause the video and audio streams to go out of sync. So, maybe this isn't a promising route to go anyway. Now, I've observed something else: If I keep the loopback cable plugged into the onboard soudcard and close mplayer, the white noise/buzzing sound over the loopback cable starts again until I start tvtime, which stops it. Can anybody explain this? I'd really like to know why I hear white noise over the loopback cable (or direct at the TV card's line-out). If anybody can give me a hint, that would be highly appreciated. [...] > [1] http://www.linuxtv.org/v4lwiki/index.php/Cx88_devices_(cx2388x) > [2] http://www.mythtv.org/wiki/index.php/PCI_TV_audio > steve -- video4linux-list mailing list Unsubscribe mailto:video4linux-list-request@redhat.com?subject=unsubscribe https://www.redhat.com/mailman/listinfo/video4linux-list