On Wed, Sep 30, 2009 at 1:17 PM, Dick Marinus <dick@mrns.nl> wrote:
Hi all,

At April 30, 2006 Fredrik posted a message about using the tuner
interface from Python and I'm experiencing the same issue:

$ python
>>> import gst
>>> source = gst.element_factory_make("v4l2src",name="Pinnacle PCTV
USB2.0")
>>> print source.get_channel()

(.:13363): GStreamer-CRITICAL **: gst_implements_interface_cast:
assertion `gst_element_implements_interface (GST_ELEMENT (from),
iface_type)' failed

** (.:13363): CRITICAL **: gst_tuner_get_channel: assertion
`GST_IS_TUNER (tuner)' failed

I've tried to set the pipeline queue to STATE_PLAYING but I still have
the same error.

I guess something is broken at the Python bindings. Could someone please
help me?

I had this same problem this week on a toy project and thaytan sent me a python script that uses GstTuner interface from v4l2src, but I still haven't looked deeply at it. I'll do it tonight and I'll update here with my findings.

One thing I noticed, though, is that GstV4l2Src is using a subclass of GstTunerChannel that is not mapped/exported in the python bindings (but I don't know much about bindings and thaytan said it worked for him, so I believe I'm doing something wrong in my code).

 

I'm using:
gst-python=0.10.16
gstreamer=0.10.24
gst-plugins-good=0.10.16
gst-plugins-base=0.10.24

Thanks in advance,
Dick


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Thiago Sousa Santos