convert-frame signal invalid

[Sebastian Dröge]

On Di, 2015-04-21 at 15:19 +0200, Harry wrote:
> Using GStreamer 1.4.5 on Windows, and trying to extract the current frame as an image, without success.
> My pipeline contains playbin as the only element, and it works fine for playing & pausing, but convert-frame fails.
> 
> My code is based on several examples I found and is similar to this:
> 
> GstCaps   *caps = gst_caps_from_string("image/png");
> GstSample *sample = 0;
> 
> gst_element_set_state(pipeline, GST_STATE_PAUSED);
> gst_element_get_state(pipeline, NULL, NULL, GST_CLOCK_TIME_NONE);
> 
> g_signal_emit_by_name(pipeline, "convert-frame", caps, &sample, NULL);
> 
> I get the error :
> 
> GLib-GObject-WARNING **: gsignal.c:3408: signal name 'convert-frame' is invalid for instance '086CD928' of type 'GstPipeline'
> 
> I get the same error when emitting the "convert-frame" signal to playbin and also to its video-sink.
> 
> Why is the "convert-frame" signal invalid ? To which element would it be valid ?

"convert-frame" is a signal on playbin, not every pipeline has it. And
you try it on a generic pipeline, not playbin.

Note also that you don't have to put playbin into a pipeline. Playbin
already *is* a pipeline.

-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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