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<div class="moz-cite-prefix">What version of GStreamer? Previous
versions of nvdec could only output to GLTextures and could not
output to system memory. Add a gldownload if you want the output
in system memory.<br>
<br>
Delayed linking generally means a caps negotiation failure.<br>
<br>
On 16/6/20 4:10 am, Борис wrote:<br>
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<div> system: win10 x64, compiler msvc 2015 x64, gstreamer
version 1.16.2 <br>
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Hi. I rebuilt gst-plugins-bad to enable support of nvidia
accelerated decoding (nvdec). It works when i run it from
gst-launch-1.0:
<div>gst-launch-1.0 filesrc location=D:/test_nvdec/jumanji.mp4 !
qtdemux ! h264parse ! nvdec ! glimagesink sync=false<br>
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<div><br>
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<div>but when i run same pipeline in my project:</div>
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<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,103,124)">qputenv</span>(<span style="color:rgb(0,128,0)">"GST_DEBUG"</span>,<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">"2"</span>);</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">QString</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(9,46,100)">pipeLine</span><span style="color:rgb(192,192,192)"> </span>=<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">QString</span>(<span style="color:rgb(0,128,0)">"filesrc</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">location=D:/test_nvdec/jumanji.mp4</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">!</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">qtdemux</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">!</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">h264parse</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">!</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">nvdec</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">!</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">videoconvert</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">!</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">appsink</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">sync</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">false"</span>);</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">cv</span>::<span style="color:rgb(128,0,128)">VideoCapture</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(9,46,100)">cap</span>(<span style="color:rgb(9,46,100)">pipeLine</span>.<span style="color:rgb(0,103,124)">toStdString</span>(),<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">cv</span>::<span style="color:rgb(128,0,128)">CAP_GSTREAMER</span>);</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">if</span><span style="color:rgb(192,192,192)"> </span>(<span style="color:rgb(9,46,100)">cap</span>.<span style="font-style:italic;color:rgb(0,103,124)">isOpened</span>())</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>{</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">Mat</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(9,46,100)">frame</span>;</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(9,46,100)">cap</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,103,124)">>></span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(9,46,100)">frame</span>;</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,103,124)">imwrite</span>(<span style="color:rgb(0,128,0)">"D:/test.png"</span>,<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(9,46,100)">frame</span>);</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>}</pre>
<pre style="margin-top:0px;margin-bottom:0px">it gives me errors:</pre>
<pre style="margin-top:0px;margin-bottom:0px">
</pre>
<pre style="margin-top:0px;margin-bottom:0px"><p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">0:00:00.165703000 26304 000001FFC4CF5E70 WARN basesrc gstbasesrc.c:3600:gst_base_src_start_complete:<filesrc0> pad not activated yet</span></p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">0:00:00.166446000 26304 000001FFC4CD29C0 WARN qtdemux qtdemux_types.c:240:qtdemux_type_get: unknown QuickTime node type gsst</span></p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">0:00:00.166577000 26304 000001FFC4CD29C0 WARN qtdemux qtdemux_types.c:240:qtdemux_type_get: unknown QuickTime node type gstd</span></p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">0:00:00.166747000 26304 000001FFC4CD29C0 WARN qtdemux qtdemux.c:3238:qtdemux_parse_trex:<qtdemux0> failed to find fragment defaults for stream 1</span></p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">0:00:00.166981000 26304 000001FFC4CD29C0 WARN qtdemux qtdemux.c:3238:qtdemux_parse_trex:<qtdemux0> failed to find fragment defaults for stream 2</span></p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">0:00:00.168948000 26304 000001FFC4CD29C0 WARN default grammar.y:510:gst_parse_no_more_pads:<qtdemux0> warning: Delayed linking failed.</span></p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">0:00:00.169078000 26304 000001FFC4CD29C0 WARN default grammar.y:510:gst_parse_no_more_pads:<qtdemux0> warning: failed delayed linking some pad of GstQTDemux named qtdemux0 to some pad of GstH264Parse named h264parse0</span></p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">0:00:00.169337000 26304 000001FFC4CD29C0 WARN qtdemux qtdemux.c:6605:gst_qtdemux_loop:<qtdemux0> error: Internal data stream error.</span></p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">0:00:00.169460000 26304 000001FFC4CD29C0 WARN qtdemux qtdemux.c:6605:gst_qtdemux_loop:<qtdemux0> error: streaming stopped, reason not-linked (-1)</span></p>
<p style="margin:0px;color:rgb(170,0,0);white-space:pre-wrap">
</p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">(gametrack_modules.exe:26304): GStreamer-CRITICAL **: 21:05:08.530: gst_element_get_bus: assertion 'GST_IS_ELEMENT (element)' failed</span></p>
<p style="margin:0px;color:rgb(170,0,0);white-space:pre-wrap">
</p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">(gametrack_modules.exe:26304): GStreamer-CRITICAL **: 21:05:08.530: gst_bus_have_pending: assertion 'GST_IS_BUS (bus)' failed</span></p>
<p style="margin:0px;color:rgb(170,0,0);white-space:pre-wrap">
</p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">(gametrack_modules.exe:26304): GStreamer-CRITICAL **: 21:05:08.530: gst_object_unref: assertion 'object != NULL' failed</span></p>
<p style="margin:0px;color:rgb(170,0,0);white-space:pre-wrap">
</p>
<p style="margin:0px;white-space:pre-wrap"><span style="color:rgb(170,0,0)">(gametrack_modules.exe:26304): GStreamer-CRITICAL **: 21:05:08.531: gst_element_send_event: assertion 'GST_IS_ELEMENT (element)' failed</span></p><p style="margin:0px;white-space:pre-wrap">
</p><p style="margin:0px;white-space:pre-wrap">but if i replace nvdec with avdec_h264 everything works as expected:</p><p style="margin:0px;white-space:pre-wrap">
</p><pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(128,0,128)">QString</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(9,46,100)">pipeLine</span><span style="color:rgb(192,192,192)"> </span>=<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">QString</span>(<span style="color:rgb(0,128,0)">"filesrc</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">location=D:/test_nvdec/jumanji.mp4</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">!</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">qtdemux</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">!</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">h264parse</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">!</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">avdec_h264</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">!</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">videoconvert</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">!</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">appsink</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">sync</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,128,0)">false"</span>);</pre><pre style="margin-top:0px;margin-bottom:0px">
</pre><pre style="margin-top:0px;margin-bottom:0px"><span style="font-family:Arial,Helvetica,sans-serif">so, what is wrong here?</span>
</pre></pre>
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