<html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> <div class="moz-cite-prefix">On 05/09/2014 09:09 PM, Luis Alberto Zarrabeitia wrote: </div> <blockquote cite="mid:CA+JSncaxJWggfcHp1y2xC8jNVZ=OVkeGmTMFRkbfJKWYNBY1qQ@mail.gmail.com" type="cite"> <pre wrap="">I'm trying to use gstreamer to read a video file for processing in opencv (opencv fails to read it, gstreamer works perfectly). However, it seems there is a problem, at least in my system, if I try to use the opencv UI functions (so far, cv::namedWindow and cv::waitKey), subsequent gstreamer calls fail. They work with gstreamer-0.10, but not with 1.0, which leads me to think the problem is in the gstreamer side or in my local insallation. Or maybe I missed a difference between 0.10 and 1.0. I'm attaching an minimalist example. I added one opencv call to the basic tutorial 1. Compiling & running it with gstreamer 1.0: $ g++ main.cpp `pkg-config --cflags --libs opencv gstreamer-1.0` fails with $ ./a.out (video:28781): GLib-GObject-WARNING **: cannot register existing type `GstObject' (video:28781): GLib-CRITICAL **: g_once_init_leave: assertion `result != 0' failed (video:28781): GLib-GObject-CRITICAL **: g_type_register_static: assertion `parent_type > 0' failed (video:28781): GLib-CRITICAL **: g_once_init_leave: assertion `result != 0' failed (video:28781): GStreamer-CRITICAL **: gst_pad_set_activatepush_function: assertion `GST_IS_PAD (pad)' failed [it gets stuck here, attaching the GST_DEBUG=4 output] Compiling with 0.10 $ g++ main.cpp `pkg-config --cflags --libs opencv gstreamer-0.10` it works perfectly. It also works perfectly with both versions if I comment out the cv::namedWindow line. Any idea of how can I work around that? I just need to be able to connect an appsink to the pipeline, or an analogous way to extract frames, to feed them to my existing program. So far, even connecting the video and audio to a fakesink results in the same error.</pre> </blockquote> I just quickly tried your main.cpp tried with upstream gstreamer and it seems to work. So it might have been fixed in some newer version but I don't remember anything being fixed in this regard recently. What version are you using? Did you do anything unusual in your gstreamer setup? You can run your app in gdb with G_DEBUG=fatal_warnings and you will have it break on those assertions so you can check the backtrace to know where the error is coming from. <blockquote cite="mid:CA+JSncaxJWggfcHp1y2xC8jNVZ=OVkeGmTMFRkbfJKWYNBY1qQ@mail.gmail.com" type="cite"> <pre wrap=""> Thanks, Luis </pre> <fieldset class="mimeAttachmentHeader"></fieldset> <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> <pre class="moz-signature" cols="72">-- Thiago Sousa Santos Senior Multimedia Engineer, Open Source Group Samsung Research America - Silicon Valley</pre> </body> </html>