[alsa-devel] ProVideo PV 918A - audi o device created but cannot capture sound
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
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
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
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
participants (2)
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Clemens Ladisch -
siddharth