two issues when recording sound

[Sebastian Dröge]

On So, 2013-12-01 at 19:33 +0100, Pablo Rodriguez wrote:
> Hi there,
> 
> first of all, congratulations for your excellent work on Gstreamer and
> many thanks for releasing it under a free license.
> 
> I have a small script that records sound from microphone to a .wav file.
> it is written in Python. You can find it at
> https://github.com/ousia/iRaccoonShow/blob/master/recslides.py, but the
> relevant part is:
> 
>         self.player = gst.Pipeline("player")
>         #~ self.clock = self.player.get_clock()
> 
>         self.source = gst.element_factory_make("alsasrc", "alsa-source")
>         #~ self.caps = gst.Caps("audio/x-raw-int,rate=16000,channels=1")
> 
>         self.encoder = gst.element_factory_make("wavenc", "wavenc")
> 
>         self.fileout = gst.element_factory_make("filesink", "sink")
>         self.fileout.set_property("location", self.audiofilename )
> 
>         self.player.add(self.source, self.encoder, self.fileout)
>         gst.element_link_many(self.source, self.encoder, self.fileout)
> 
> Before I forget, I use Fedora 19, which comes with gstreamer-0.10.36.
> 
> When I start the script, I always get the following error:
> 
>     ** Message: pygobject_register_sinkfunc is deprecated (GstObject)
> 
> How could I fix this?

You can't, but that's not a problem. It just warns you that
gstreamer-python uses old pygobject API.

If you use a 1.x version of gstreamer-python you won't see this anymore,
and also should really consider updating to that because 0.10.x is
unmaintained and unsupported since quite some time.

> The other issue is the only commented line in the code snippet above. I
> would like to have the sound recorded with a lower frame rate and only
> one channel (otherwise, output files are huge).
> 
> How should I integrate the self.caps line, so that I have an output
> files with these features?

You'll create a capsfilter element and link it between alsasrc and
wavenc. capsfilter has the "caps" property, on which you can set the
caps you create there in the commented out line.

-- 
Sebastian Dröge <sebastian at centricular.com>
Centricular Ltd - http://www.centricular.com
Expertise, Straight from the Source
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