ProVideo PV 918A - audi o device created but cannot capture sound

ProVideo PV 918A - audi o device created but cannot capture sound

[siddharth]

Hi,

I have installed a ProVideo PV 981.

I was able to get the sound device detected by putting 

modprobe snd-bt87x load_all=1 digital_rate=48000 enable=1

but am unable to capture sound. I am using Fedora 19 on an intel i5 machine.

In dmesg i get the error:

[  235.145932] ALSA sound/pci/bt87x.c:860 unknown card 0x878-0xaa00:0x1460
[  235.145935] ALSA sound/pci/bt87x.c:863 please mail id, board name, and,
if it works, the correct digital_rate option to <alsa-devel@alsa-project.org>
[  235.146061] ALSA sound/pci/bt87x.c:931 bt87x0: Using board 0, analog,
digital (rate 48000 Hz)


Any help will be appreciated.

regards
Siddharth

Re: ProVideo PV 918A - audi o device created but cannot capture sound

[Clemens Ladisch]

siddharth wrote:
> modprobe snd-bt87x load_all=1 digital_rate=48000 enable=1

You are telling the driver that the tuner chip has a digital output that
runs at 48 kHz, and this it is connected to the digital input pin of the
Bt878 chip.

> but am unable to capture sound.

Do you actually know that your hardware is constructed that way?

How exactly did you try to capture?  From which device?  (see "arecord -l")


Regards,
Clemens

Re: ProVideo PV 918A - audi o device created but cannot capture sound

[siddharth]

On 17-01-2014 14:17, Clemens Ladisch wrote:
> siddharth wrote:
>> modprobe snd-bt87x load_all=1 digital_rate=48000 enable=1
> 
> You are telling the driver that the tuner chip has a digital output 
> that
> runs at 48 kHz, and this it is connected to the digital input pin of 
> the
> Bt878 chip.
> 
>> but am unable to capture sound.
> 
> Do you actually know that your hardware is constructed that way?
> 
> How exactly did you try to capture?  From which device?  (see "arecord 
> -l")
> 
> 
> Regards,
> Clemens

I tried loading the module without the digital_rate param as well but to 
no avail.
Am not sure how the card hardware is constructed :( I just tried the 
digital_rate param after reading in the dmesg that it may work :)

But as soon as I load the module, the sound setting panel in gnome shows 
8 audio input devices. a video and a radio input device for each input 
(there are 4 hardware a/v inputs to the card)

arecord -l shows the following:
card 1: Bt878 [Brooktree Bt878], device 0: Bt87x Digital [Bt87x Digital]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 1: Bt878 [Brooktree Bt878], device 1: Bt87x Analog [Bt87x Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 2: Bt878_1 [Brooktree Bt878], device 0: Bt87x Digital [Bt87x 
Digital]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 2: Bt878_1 [Brooktree Bt878], device 1: Bt87x Analog [Bt87x Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0

....and so on till card 4.

For capturing, I used vlc alsa://hw:1,1 I also tried 1,0, 2,0 2,1 etc.
Even the sound setting app in gnome does not show any input, which it 
shows by a flickering equaliser for the native sound card of the 
machine.

regards
Siddharth

Re: ProVideo PV 918A - audi o device created but cannot capture sound

[Clemens Ladisch]

siddharth wrote:
> For capturing, I used vlc alsa://hw:1,1 I also tried 1,0, 2,0 2,1 etc.

It's possible that the tuner does not output anything unless it is actually
tuned to something, i.e., you need to run video capture.

> Am not sure how the card hardware is constructed

Then it's likely that it's not possible to record the sound that way.


Regards,
Clemens