[gst-devel] FM radio using v4lsrc

thiagossantos at gmail.com thiagossantos at gmail.com
Fri Feb 12 12:04:05 CET 2010

On Thu, Feb 11, 2010 at 12:47 PM, 4ernov <4ernov at gmail.com> wrote:

> Hello,
> we develop an application receiving FM radio based on GStreamer. But I
> can't understand how to create a pipeline with v4lsrc or v4l2src only for
> radio signal (without video). I tried
> gst-launch -vvv v4l2src device=/dev/radio0 ! decodebin ! pulsesink
> in command line at first, but it fails:
> (gst-launch-0.10:2489): GLib-WARNING **: g_set_prgname() called multiple
> times
> Setting pipeline to PAUSED ...
> ERROR: Pipeline doesn't want to pause.
> ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Device
> '/dev/radio0' is not a capture device.
> Additional debug info:
> v4l2_calls.c(504): gst_v4l2_open ():
> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> Capabilities: 0x50400
> Setting pipeline to NULL ...
> Freeing pipeline ...
> Could anybody suggest me the right pipeline for FM radio signal processing
> or maybe the right parameters for v4lsrc or v4l2src sources?

By looking at v4l2src output caps, it doesn't seem to support radio
reception (there are only video formats). Maybe you could try adding support
to it or writing a separate element for audio (in case the calls/interface
is really different).

Btw, a friend of mine had developed an element for radio playback, it worked
for his purposes. You can take a look at it:

> Thank you very much in advance,
> Alexey Chernov
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Thiago Sousa Santos
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