using the tuner interface from python
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using the tuner interface from python
 
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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'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 ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: using the tuner interface from python
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On Wed, Sep 30, 2009 at 1:17 PM, Dick Marinus <[hidden email]> wrote: Hi all, 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).
-- Thiago Sousa Santos ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: using the tuner interface from python
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On Wed, Sep 30, 2009 at 2:52 PM, thiagoss <[hidden email]> wrote:
Found what was wrong: 1) It will not work on NULL state, I don't know if works on READY, tested only with it PLAYING and I'm assuming it also works for PAUSED 2) You're not supposed to create your own gst.TunerChannel objects and set them, you have to do src.list_channels() and pick one to set. Works perfectly here. Maybe the docs could be updated to clarify this.
-- Thiago Sousa Santos ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: using the tuner interface from python
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In reply to this post by Dick Marinus
> From: Dick Marinus [[hidden email]]
> Sent: Wednesday, September 30, 2009 11:17 AM > To: [hidden email] > Subject: [gst-devel] using the tuner interface from python > > I've tried to set the pipeline queue to STATE_PLAYING but I still have > the same error. >From C, I couldn't get any of the gst_tuner stuff to work until I set the pipeline to GST_STATE_PAUSED. --wally. ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: using the tuner interface from python
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Kulecz, Walter (JSC-SK)[WYLE INTEG. SCI. & ENG.] schrieb:
>> From: Dick Marinus [[hidden email]] >> Sent: Wednesday, September 30, 2009 11:17 AM >> To: [hidden email] >> Subject: [gst-devel] using the tuner interface from python >> >> I've tried to set the pipeline queue to STATE_PLAYING but I still have >> the same error. > >>From C, I couldn't get any of the gst_tuner stuff to work until I set the pipeline to GST_STATE_PAUSED. > > --wally. this is perfectly normal but a surpise to everybody at first encounter. These kind of interfaces are dynamic. Once a device is opened (READY) its features are queried and the interfaces are added or not. So in NULL the elements simply does not know yet what it will be capable of. There is agreements to drop GST_IMPLEMENTS_INTERFACE and rather have a _is_supported method in such interfaces. This probably needs a threestate return like: NO, MAYBE, YES (maybe as in I-don't-know-yet). Stefan ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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