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<p><tt><font size="+1">Hello,</font></tt></p>
<p><tt><font size="+1">I am trying to get a little more familiar
with gstreamer, and thought I'd do some</font></tt></p>
<p><tt><font size="+1">of the "basic" programming tutorial examples.</font></tt></p>
<p><tt><font size="+1"><br>
</font></tt></p>
<p><tt><font size="+1">I </font></tt>did play with the 3rd example:</p>
<p><a class="moz-txt-link-freetext" href="https://gstreamer.freedesktop.org/documentation/tutorials/basic/dynamic-pipelines.html?gi-language=c">https://gstreamer.freedesktop.org/documentation/tutorials/basic/dynamic-pipelines.html?gi-language=c</a></p>
<p><br>
</p>
<p>If I copy the example, and compile it, it works, no surprise
there. But when I change it and do the "exercise", I get some
weirdness.<br>
</p>
<p><br>
</p>
<p>What I noticed is (well I probably missed something)... but the
function call:</p>
<pre class=" language-c"><code class=" language-c">data<span class="token punctuation">.</span>sink <span class="token operator">=</span> gst_element_factory_make <span class="token punctuation">(</span><span class="token string">"autoaudiosink"</span><span class="token punctuation">,</span> <span class="token string">"sink"</span><span class="token punctuation">)</span><span class="token punctuation">;
</span>According to the docs, the 2nd parameter can be 'whatever' you want to name it.
Since I wanted to do the video part too, I figure I should change the name to
"audio-something", and changed the second function call to:
</code><code class=" language-c"> data.convert = gst_element_factory_make ("audioconvert", "convert"); (original)
data.sink = gst_element_factory_make ("autoaudiosink", "audiosink"); (changed name)<span class="token punctuation"></span></code>
of course in the even handler (pad_added_handler), the name needs to be changed in to:
<code class=" language-c">GstPad *sink_pad = gst_element_get_static_pad (data->convert, "audiosink");<span class="token punctuation">
Browsing through the code, that should be it, BUT it seems "</span></code><code class=" language-c">sink_pad</code>"<code class=" language-c"><span class="token punctuation"></span></code><code class=" language-c"></code> always is NULL
and the pipeline elements don't/can't be linked. (see errors below)
since this is supposed to be a simple example, what am I missing?
thanks,
Ron
errors:
# ./basic-tutorial-3
Pipeline state changed from NULL to READY:
Received new pad 'src_0' from 'source':
(basic-tutorial-3:14679): GStreamer-CRITICAL **: 20:22:54.991: gst_pad_is_linked: assertion 'GST_IS_PAD (pad)' failed
It has type 'video/x-raw' which is not raw audio. Ignoring.
(basic-tutorial-3:14679): GStreamer-CRITICAL **: 20:22:54.992: gst_object_unref: assertion 'object != NULL' failed
Received new pad 'src_1' from 'source':
(basic-tutorial-3:14679): GStreamer-CRITICAL **: 20:22:54.992: gst_pad_is_linked: assertion 'GST_IS_PAD (pad)' failed
(basic-tutorial-3:14679): GStreamer-CRITICAL **: 20:22:54.992: gst_pad_link_full: assertion 'GST_IS_PAD (sinkpad)' failed
Type is 'audio/x-raw' but link failed.
(basic-tutorial-3:14679): GStreamer-CRITICAL **: 20:22:54.992: gst_object_unref: assertion 'object != NULL' failed
Error received from element source: Internal data stream error.
Debugging information: gstbasesrc.c(2950): gst_base_src_loop (): /GstPipeline:test-pipeline/GstURIDecodeBin:source/GstSoupHTTPSrc:source:
streaming stopped, reason not-linked (-1)
</pre>
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