[mythtv-users] Re: MythTV is not capturing audio?

Chad masterclc at gmail.com
Thu Jun 23 08:59:41 UTC 2005

On 6/22/05, Chad <masterclc at gmail.com> wrote:
> Hi!
> I have been plugging away day and night trying to figure this out, but
> can't come to any good conclusion.
> When I view a card from xawtv, I can hear the audio and see the video.
>  But, when I throw Myth into the mix, I can no longer hear any audio.
> I have the capture set to the Line-In, which is where the cable is ran
> to from the card's audio out.  The tuner card is an saa7134 deal, I'll
> post up lspci at the end for completeness.  The audio card is a cmipci
> (C-Media) card.  I grabbed a handful of them because the price was
> right and I knew they were supported with Alsa in Linux.  Just to make
> sure it wasn't just an audio out problem, I played back a captured
> program from before adding this card, and it works just fine.  This is
> a second tuner/second audio card in my system, so I've troubleshot all
> combinations, and it seems that it all comes down to audio capture
> from this particular card.  Any combo works in xawtv, and any combo
> provides video, it's just that myth doesn't seem to be able to record
> from the audio card's Line-In (capture) port...
> Any suggestion are very welcome.  Here's my lspci output:
> -------------------------------------------------------------------------------------------------------
> 0000:00:00.0 Host bridge: VIA Technologies, Inc. VT8385 [K8T800 AGP]
> Host Bridge (rev 01)
> 0000:00:01.0 PCI bridge: VIA Technologies, Inc. VT8237 PCI bridge [K8T800 South]
> 0000:00:07.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394
> Host Controller (rev 80)
> 0000:00:08.0 RAID bus controller: Promise Technology, Inc. PDC20378
> (FastTrak 378/SATA 378) (rev 02)
> 0000:00:09.0 Multimedia audio controller: C-Media Electronics Inc
> CM8738 (rev 10)
> 0000:00:0a.0 Ethernet controller: Marvell Technology Group Ltd.
> Gigabit Ethernet Controller (rev 13)
> 0000:00:0b.0 Multimedia controller: Philips Semiconductors SAA7130
> Video Broadcast Decoder (rev 01)
> 0000:00:0c.0 Multimedia video controller: Brooktree Corporation Bt878
> Video Capture (rev 11)
> 0000:00:0c.1 Multimedia controller: Brooktree Corporation Bt878 Audio
> Capture (rev 11)
> 0000:00:0e.0 Multimedia audio controller: Creative Labs SB Live!
> EMU10k1 (rev 07)
> 0000:00:0e.1 Input device controller: Creative Labs SB Live! MIDI/Game
> Port (rev 07)
> 0000:00:0f.0 RAID bus controller: VIA Technologies, Inc. VIA VT6420
> SATA RAID Controller (rev 80)
> 0000:00:0f.1 IDE interface: VIA Technologies, Inc.
> VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
> 0000:00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB
> 1.1 Controller (rev 81)
> 0000:00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB
> 1.1 Controller (rev 81)
> 0000:00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB
> 1.1 Controller (rev 81)
> 0000:00:10.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB
> 1.1 Controller (rev 81)
> 0000:00:10.4 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 86)
> 0000:00:11.0 ISA bridge: VIA Technologies, Inc. VT8237 ISA bridge
> [KT600/K8T800 South]
> 0000:00:18.0 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] HyperTransport Technology Configuration
> 0000:00:18.1 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] Address Map
> 0000:00:18.2 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] DRAM Controller
> 0000:00:18.3 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] Miscellaneous Control
> 0000:01:00.0 VGA compatible controller: nVidia Corporation NV17
> [GeForce4 MX 440] (rev a3)
> ------------------------------------------------------------------------------------------
> Myth Version is 0.18.1
> Distro: Gentoo
> Kernel: 2.6.11
> Thank you!

Ok, so it looks like I misdiagnosed the problem.  I just ripped all
the cards out of my box, and just used the onboard audio, this way I
can completely eliminate IRQ conflicts, whatever.

So, it seems that it's actually the saa7134 card that is giving me the
trouble, not the audio card.

I have tried a plethora of combinations of card= and tuner= from the
Documentation from my kernel, but nothing seems to give me any audio. 
However, when I view the card with xawtv, I get both audio and video. 
If I plug my speakers directly into the audio-out jack on the Tuner
card, I get audio while it's playing in mythtv...

I really haven't got a clue what might be going on here, any
suggestions are extremely welcome.

I've pulled the card, and here are numbers if anyone cares:

On the tuner itself it says:
Easy TV Capture
Then there are 8 boxes (well 9, but the 9th isn't directly below the
above line, but it's for FM radio) for different TV standards.  The
NTSC box is blackened (I live in the US, so that's good ;) )  Then
there is a picture of a cartoon looking TV with the letters TV in the

The chip says:
RA6794.1   02

Then, a sticker on the back says:
Philips 7130 TV Tuner Card
Then a barcode, followed with:
HY 7130TV 0822390

Thanks for any ideas!

More information about the mythtv-users mailing list