Unable to capture audio from a tv tuner

[Edhoari Setiyoso]

Hi Charlie,

I already confirmed that the audio device is that of tv tuner. The funny
thing is the audio device active only when I access the corresponding video
device. I can see from the audio mixer the audio level is moving. As soon
as I turn off the app accessing the video device, the audio level went down
completely.

Testing with mplayer showed that I must use "immediate=0" option, otherwise
I only get video. From the manual it says "A value of 0 means capture and
buffer audio and video together".

Could you give me a hint on this?

Regards


On Sat, Mar 2, 2013 at 2:40 AM, Charlie X. Liu <charlie at sensoray.com> wrote:

> You need to use "arecord -l" to find out and confirm that the "hw:2,0" is
> your "Avermedia Volar Go M"
> (
> http://www.avermedia.com/avertv/Product/ProductDetail.aspx?Id=529&tab=APDri
> ver) audio device link.
>
> Then, simply use "arecord -D hw:2,0 | aplay" or "gst-launch-0.10 alsasrc
> device=hw:1,0 ! audio/x-raw-int,rate=\
> 32000,channels=2,depth=16 ! audioconvert ! autoaudiosink" to confirm that
> you can pre-listening from your device and the hardware works.
>
> Next, apply your application ...
>
> Good luck and BR,
>
> Charlie X. Liu @ Sensoray Company Inc. (http://www.sensoray.com/)
>
>
> -----Original Message-----
> From: gstreamer-devel-bounces+charlie=sensoray.com at lists.freedesktop.org
> [mailto:gstreamer-devel-bounces+charlie=sensoray.com at lists.freedesktop.org
> ]
> On Behalf Of edhoari
> Sent: Friday, March 01, 2013 9:43 AM
> To: gstreamer-devel at lists.freedesktop.org
> Subject: Unable to capture audio from a tv tuner
>
> Hi all,
>
> I'm fairly new with Gstreamer and trying to build a application to digitize
> analog video. I'm using Avermedia Volar Go M as capture device for
> composite
> input.
>
> My problem is that I cannot get any audio from it. I can capture video
> without problem with the following command
>
> gst-launch-0.10 v4l2src device=/dev/video1 !
> 'video/x-raw-yuv,width=640,height=480' ! ffmpegcolorspace ! xvimagesink
>
> And here is the command to capture audio
>
> gst-launch -e alsasrc device=hw:2,0 ! audioconvert ! lamemp3enc target=1
> bitrate=128 cbr=true ! filesink location=audio.mp3
>
> But I get nothing from audio input. I can confirm that the card is working
> just fine because the following command can capture video and audio without
> problem.
>
> mplayer -tv
> driver=v4l2:input=1:device=/dev/video1:alsa=1:adevice=hw.1:immediatemode=0
> tv:// -ao sdl
>
> This is audio capture card list in my system:
>
> **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel],
> device
> 0: ALC883 Analog [ALC883 Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: Intel [HDA Intel], device 1: ALC883 Digital [ALC883 Digital]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: Intel [HDA Intel], device 2: ALC883 Analog [ALC883 Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 2: Cx231xxAudio [Cx231xx Audio], device 0: Cx231xx Audio [Conexant
> cx231xx Capture]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
>
> Any help would be appreciated.
>
> Regards
>
>
>
> --
> View this message in context:
>
> http://gstreamer-devel.966125.n4.nabble.com/Unable-to-capture-audio-from-a-t
> v-tuner-tp4658837.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
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-- 
Edhoari Setiyoso
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