Just revisiting this again after close to 2 years - still experiencing the same. Loud static like sound. Tried a few CX23881 cards and it seems the same :( I'm doing: arecord -D hw:1,0 -f dat test.wav I tried it for all the CX8801 audio sources (8 chip DVR card), here are the output wav files and waveforms: http://itstar.co.uk/CX8801_Audio Any ideas at all? Roman On 11 November 2009 09:12, Roman Gaufman <hackeron@xxxxxxxxx> wrote: > > It sounds like I've not tuned the channel, but there is no channel - > it's a capture card with 8 inputs. When I try to change channels with > mplayer 'h' key, the sound changes slightly and I can hear it turn > sound off and turn it back on. > > Is there a specific frequency I need to set? - I tried all channels > available in mplayer and all I hear is loud static/white noise. > > Anyone? > > 2009/11/10 Roman Gaufman <roman@xxxxxxxxxxx>: > > Tried this again on 2.6.31-14 and still not able to get audio working. > > Using this command: > > > > mplayer -vo null tv:// -tv > > driver=v4l2:device=/dev/video1:alsa:adevice=hw.2,0:amode=1:audiorate=48000:forceaudio:volume=100:immediatemode=0:norm=PAL-BG:fps=25:input=0 > > > > Video works but getting nothing but loud static on audio. Please help :( > > > > > > 2008/8/3 Roman Gaufman <hackeron@xxxxxxxxx>: > >> Hi, > >> > >> I have an 8 audio + 8 video PCI-Express Conexant 23881 DVR Card I'm > >> trying to get working in Linux. > >> > >> The video channels all work flawlessly and the audio is recognized, > >> but I just get very loud white noise no matter what I try. > >> > >> I tried the following commands and been googling for days to no avail: > >> > >> for i in 0 1 2 3 4 5 6 7; do /usr/bin/mencoder tv:// -tv > >> driver=v4l2:device=/dev/video$i:alsa:adevice=hw.$i,0:amode=0:audiorate=32000:volume=100:immediatemode=0:norm=PAL-DK:input=0:width=720:height=576:outfmt=yuy2 > >> -oac mp3lame -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=5000 -frames > >> 300 -o test$i.avi & Âdone > >> > >> for i in 0 1 2 3 4 5 6 7; do arecord -d 10 -D hw:$i,0 -c 2 -f S16_LE > >> --period-size=65536 --buffer-size=524288 -r 48000 test$i.wav & done > >> > >> I had to boot the kernel with acpi=off irqpoll for video not to give > >> me input/output errors, but audio still gives me loud white noise. > >> > >> The only error messages I see are: > >> > >> [ 3758.546252] cx88[4]/1: IRQ loop detected, disabling interrupts > >> [ 3758.546323] cx88[4]: irq aud [0x1000] dn_sync* > >> [ 3758.546329] cx88[4]: irq aud [0x1001] dn_risci1* dn_sync* > >> > >> My bios Plug & Play OS setting is set to no. > >> > >> This is what arecord -l returns: > >> > >> **** List of CAPTURE Hardware Devices **** > >> card 0: CX8801_1 [Conexant CX8801], device 0: CX88 Digital [CX88 Digital] > >> ÂSubdevices: 1/1 > >> ÂSubdevice #0: subdevice #0 > >> card 1: CX8801 [Conexant CX8801], device 0: CX88 Digital [CX88 Digital] > >> ÂSubdevices: 1/1 > >> ÂSubdevice #0: subdevice #0 > >> card 2: CX8801_2 [Conexant CX8801], device 0: CX88 Digital [CX88 Digital] > >> ÂSubdevices: 1/1 > >> ÂSubdevice #0: subdevice #0 > >> card 3: CX8801_3 [Conexant CX8801], device 0: CX88 Digital [CX88 Digital] > >> ÂSubdevices: 1/1 > >> ÂSubdevice #0: subdevice #0 > >> card 4: CX8801_4 [Conexant CX8801], device 0: CX88 Digital [CX88 Digital] > >> ÂSubdevices: 1/1 > >> ÂSubdevice #0: subdevice #0 > >> card 5: CX8801_5 [Conexant CX8801], device 0: CX88 Digital [CX88 Digital] > >> ÂSubdevices: 1/1 > >> ÂSubdevice #0: subdevice #0 > >> card 6: CX8801_6 [Conexant CX8801], device 0: CX88 Digital [CX88 Digital] > >> ÂSubdevices: 1/1 > >> ÂSubdevice #0: subdevice #0 > >> card 7: CX8801_7 [Conexant CX8801], device 0: CX88 Digital [CX88 Digital] > >> ÂSubdevices: 1/1 > >> ÂSubdevice #0: subdevice #0 > >> > >> This is what lspci -v returns (both with and without -n) > >> > >> - [ ] 04:07.0 Multimedia video controller: Conexant CX23880/1/2/3 PCI > >> Â Â ÂVideo and Audio Decoder (rev 05) > >> Â Â Â ÂSubsystem: Unknown device c180:c980 > >> Â Â Â ÂFlags: bus master, medium devsel, latency 64, IRQ 19 > >> Â Â Â ÂMemory at d0000000 (32-bit, non-prefetchable) [size=16M] > >> Â Â Â ÂCapabilities: [44] Vital Product Data > >> Â Â Â ÂCapabilities: [4c] Power Management version 2 > >> - [ ] 04:07.0 0400: 14f1:8800 (rev 05) > >> Â Â Â ÂSubsystem: c180:c980 > >> Â Â Â ÂControl: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- > >> Â Â ÂParErr- Stepping- SERR- FastB2B- > >> Â Â Â ÂStatus: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- > >> Â Â Â<TAbort- <MAbort- >SERR- <PERR- > >> Â Â Â ÂLatency: 64 (5000ns min, 13750ns max), Cache Line Size: 32 bytes > >> Â Â Â ÂInterrupt: pin A routed to IRQ 19 > >> Â Â Â ÂRegion 0: Memory at d0000000 (32-bit, non-prefetchable) > >> Â Â Â[size=16M] > >> Â Â Â ÂCapabilities: [44] Vital Product Data > >> Â Â Â ÂCapabilities: [4c] Power Management version 2 > >> Â Â Â Â Â Â Â ÂFlags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA > >> Â Â ÂPME(D0-,D1-,D2-,D3hot-,D3cold-) > >> Â Â Â Â Â Â Â ÂStatus: D0 PME-Enable- DSel=0 DScale=0 PME- > >> > >> - [ ] 04:07.1 Multimedia controller: Conexant CX23880/1/2/3 PCI Video > >> Â Â Âand Audio Decoder [Audio Port] (rev 05) > >> Â Â Â ÂSubsystem: Unknown device c180:c980 > >> Â Â Â ÂFlags: bus master, medium devsel, latency 64, IRQ 19 > >> Â Â Â ÂMemory at d1000000 (32-bit, non-prefetchable) [size=16M] > >> Â Â Â ÂCapabilities: [4c] Power Management version 2 > >> - [ ] 04:07.1 0480: 14f1:8801 (rev 05) > >> Â Â Â ÂSubsystem: c180:c980 > >> Â Â Â ÂControl: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- > >> Â Â ÂParErr- Stepping- SERR- FastB2B- > >> Â Â Â ÂStatus: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- > >> Â Â Â<TAbort- <MAbort- >SERR- <PERR- > >> Â Â Â ÂLatency: 64 (1000ns min, 63750ns max), Cache Line Size: 32 bytes > >> Â Â Â ÂInterrupt: pin A routed to IRQ 19 > >> Â Â Â ÂRegion 0: Memory at d1000000 (32-bit, non-prefetchable) > >> Â Â Â[size=16M] > >> Â Â Â ÂCapabilities: [4c] Power Management version 2 > >> Â Â Â Â Â Â Â ÂFlags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA > >> Â Â ÂPME(D0-,D1-,D2-,D3hot-,D3cold-) > >> Â Â Â Â Â Â Â ÂStatus: D0 PME-Enable- DSel=0 DScale=0 PME- > >> > >> Any ideas at all? 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