<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">On 08/19/2015 05:35 PM, James Felix
Black wrote:<br>
</div>
<blockquote
cite="mid:1440016550.2798814.360669409.11243BF2@webmail.messagingengine.com"
type="cite">
<title></title>
<div>I ran at DEBUG 2 and didn't get much interesting info., but I
also just wrote something to read the raw RGBA frame sample data
and now I can point OpenCV at that. <br>
</div>
</blockquote>
Well, it would be nice to debug your case as well to understand what
was wrong as it seems like it should work. Can you please get a
GST_DEBUG=6 and attach to a bug in bugzilla.gnome.org under
GStreamer?<br>
<br>
Thanks!<br>
<blockquote
cite="mid:1440016550.2798814.360669409.11243BF2@webmail.messagingengine.com"
type="cite">
<div> </div>
<div>Cheers.</div>
<div> </div>
<div> </div>
<div>On Wed, Aug 19, 2015, at 16:19, Thiago Santos wrote:<br>
</div>
<blockquote type="cite">
<div>On 08/19/2015 03:46 PM, James Felix Black wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1440010011.2772906.360579729.60567105@webmail.messagingengine.com">
<div>On Wed, Aug 19, 2015, at 13:52, Thiago Santos wrote:<br>
</div>
<blockquote type="cite">
<div>On 08/19/2015 02:42 PM, James Felix Black wrote:<br>
</div>
<blockquote
cite="mid:1440006164.2756501.360488729.41C9CF17@webmail.messagingengine.com"
type="cite">
<div>Linux ARM (nVidia Jetson TK1), gstreamer-1.5.2, Qt
5.5, qt-streamer 1.2.0<br>
</div>
<div> </div>
<div>I have a simple X11 application that I'm working,
based for now on the qt-gstreamer demo code [1] that
plays a video to the screen, and snapshots "interesting"
frames to disk. I'm using Qt and the qt-gstreamer
package, and I am able to access sample data directly
off the pipeline (using the "sample" property at a given
time), and write the raw video to disk as such:<br>
</div>
<div> </div>
<div>
<div> QGlib::Value val =
pipeline->property("sample");<br>
</div>
<div> GstSample * v = (GstSample
*)g_value_get_boxed(val);<br>
</div>
<div> </div>
<div> // write the contents of v's memory buffer to
disk ....<br>
</div>
<div> </div>
<div>What I get is a raw file of 4bytes * 1920 * 1080.
That's cool! But what I want to do is:<br>
</div>
<div> </div>
<div> GstCaps * jpegCaps =
gst_caps_new_simple("image/jpeg", "width", G_TYPE_INT,
640, NULL);<br>
</div>
<div> GError * err;<br>
</div>
<div> GstSample * jpeg = gst_video_convert_sample(v,
jpegCaps, 100, &err);<br>
</div>
<div> </div>
<div>... and then write the contents of *that* sample to
disk, instead. However, if I do that conversion, jpeg
is null and the error is:<br>
</div>
<div> </div>
<div>"Cannot find any image encoder for caps image/jpeg"<br>
</div>
<div> </div>
<div>OK, that seems fair. But my pipeline (again see the
example code at [1]) is constructed as such:<br>
</div>
<div> </div>
<div> m_pipeline =
QGst::ElementFactory::make("playbin").dynamicCast<QGst::Pipeline>();<br>
</div>
<div> </div>
<div>My question then becomes: how should I approach
this problem? Should I modify the pipeline? I see that
there's a "convert-sample" signal on playbin; is that
what I should be using?<br>
</div>
<div> </div>
<div>Any light anyone can shed would be most welcome.<br>
</div>
</div>
</blockquote>
<div> </div>
<div>Do you have jpegenc (or any other jpeg encoder) in your
system? gst-inspect-1.0 jpegenc should show it. Or
gst-inspect-1.0 |grep jpeg.<br>
</div>
<div> </div>
</blockquote>
<div> </div>
<div>I was missing jpegenc; thanks. Having installed it, I now
get an "Internal data flow error". <br>
</div>
<p><span>default convertframe.c:325:gst_video_convert_sample:</span><span>
Could not convert video frame: Internal data flow error.</span><br>
</p>
<div>This is using a one-second timeout on the frame
conversion (GST_SECOND). Hmmm. Any pointers here?<br>
</div>
</blockquote>
<div>I'd recommend using GST_DEBUG to get some log and check
what exactly was the error.<br>
</div>
<div> </div>
<div> </div>
<blockquote type="cite"
cite="mid:1440010011.2772906.360579729.60567105@webmail.messagingengine.com">
<div> </div>
<div> </div>
<pre>_______________________________________________
gstreamer-devel mailing list
<a moz-do-not-send="true" href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a moz-do-not-send="true" href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a>
</pre>
</blockquote>
<div> </div>
<div> </div>
<pre>--
Thiago Sousa Santos
Senior Multimedia Engineer, Open Source Group
Samsung Research America - Silicon Valley
</pre>
<div><u>_______________________________________________</u><br>
</div>
<div>gstreamer-devel mailing list<br>
</div>
<div><a moz-do-not-send="true"
href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a><br>
</div>
<div><a moz-do-not-send="true"
href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a><br>
</div>
</blockquote>
<div> </div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
gstreamer-devel mailing list
<a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a>
<a class="moz-txt-link-freetext" href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a>
</pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Thiago Sousa Santos
Senior Multimedia Engineer, Open Source Group
Samsung Research America - Silicon Valley</pre>
</body>
</html>