Re: bttv audio?

From: Arno Wagner (me_at_privacy.net)
Date: 11/26/04 

Date: 25 Nov 2004 23:23:41 GMT

Previously Andrew Schulman <andrex@deadspam.com> wrote:
> I have a cheapo Bt878 TV tuner card-- an AITech WaveWatcher TV-PCI. It
> cost $10 and it works, so I'm happy. That is, the video works, but so
> far the audio doesn't.

> I know (or at least, I expect) that I can get the sound to work by
> running a patch cable from the sound output of the TV tuner card to one
> of the inputs on my sound card. I don't happen to have a patch cable
> handy, so I haven't tried this yet. But now I wonder: can I get the TV
> audio to play via software, without a hardware connection to the sound
> card?

On my bttv card Audio comes more or less directly from the tuner and
cannot be captured on the card. This is not a driver issue, there
is just no electonics on the card that would turn the audio to digital.

> Right now I have the bttv and snd-bt87x drivers inserted. I'm using
> ALSA, and in kmix there's an entry for the Bt878 sound card. It has
> just one mixer, "Capture" output, which is at full volume. But, I don't
> hear anything yet. I've turned on and up all of the input channels on
> my sound card, but no luck.

> So somehow I need to connect the TV tuner output to the sound card
> input, in software. Can anyone help?

Depending on the hardware, it may be findamentally impossible.
AFAIK the BT-chip itself does not have sound capture.

Arno 

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