<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <meta name="Generator" content="Microsoft Exchange Server"> <style></style> </head> <body> <meta content="text/html; charset=UTF-8"> <style type="text/css" style="">  </style> <div dir="ltr"> <div id="x_divtagdefaultwrapper" dir="ltr" style="font-size:12pt; color:#000000; font-family:Calibri,Arial,Helvetica,sans-serif"> Hi Here it is. I have no idea about mxc_v4l_dqueue . Sorry. Mikl </div> <hr tabindex="-1" style="display:inline-block; width:98%"> <div id="x_divRplyFwdMsg" dir="ltr">From: gstreamer-devel <gstreamer-devel-bounces@lists.freedesktop.org> on behalf of 张若 <zr92zr@gmail.com> Sent: Thursday, November 17, 2016 7:56:16 PM To: Discussion of the development of and with GStreamer Subject: Re: mxc_v4l_dqueue timeout enc_counter 0 <div> </div> </div> </div> <div class="PlainText">OK, that's should be great and I can get some ideas from that! Thank you! However, on the other hand, the mxc_v4l_dqueue timeout enc_conunter() errors seem to be related to set the pipeline to NULL state. For that one, do you have some ideas and recommendations? 2016-11-17 19:48 GMT+01:00, Michael Yarochkin <michael.yarochkin@timetronics.be>: > Hi > > > In my app, i am not doing any of unref at all. GStreamer is taking care > about it. > > Recreating all elements every time i need to play something Even for the > same file. > > > And once you are unref element, which should be cleaned up in another place, > you can cause memory access exception. > > > Because you are talking about frames from the past, it can be you are > reusing the same elements in your new pipeline. > > > Do you want me to send you my library? > > > Mikl > > ________________________________ > From: gstreamer-devel <gstreamer-devel-bounces@lists.freedesktop.org> on > behalf of 张若 <zr92zr@gmail.com> > Sent: Thursday, November 17, 2016 5:39:54 PM > To: Discussion of the development of and with GStreamer > Subject: Re: mxc_v4l_dqueue timeout enc_counter 0 > > I once tried not to unref the pipeline. However, when I want to play that > pipeline again later, there will be a large switch latency and delay, also > many previous frames displayed at the beginning. I don't know why and how to > deal with that. Therefore, I just unref pipeline and build the full pipeline > and elements inside again. > > 2016-11-17 11:23 GMT+01:00 Michael Yarochkin > <michael.yarochkin@timetronics.be<mailto:michael.yarochkin@timetronics.be>>: > Hello > > Do you really need to do unref on pipeline? > > Mikl > ________________________________ > From: gstreamer-devel > <gstreamer-devel-bounces@lists.freedesktop.org<mailto:gstreamer-devel-bounces@lists.freedesktop.org>> > on behalf of 张若 <zr92zr@gmail.com<mailto:zr92zr@gmail.com>> > Sent: Tuesday, November 15, 2016 3:45:16 PM > To: Discussion of the development of and with GStreamer > Subject: mxc_v4l_dqueue timeout enc_counter 0 > > Hi, > > I got a problem while setting the pipeline state to NULL and unref that > pipeline. > > In my code, I need to stop two pipelines (imxv4l2src are two cameras) and > start two new pipelines. While stopping current pipelines, I use: > gst_element_set_state (pipeline1, GST_STATE_NULL); > gst_object_unref (pipeline1); > gst_element_set_state (pipeline2, GST_STATE_NULL); > gst_object_unref (pipeline2); > > Sometimes, when it runs here, the program will stuck for a while and show an > error or 2 errors (because of 2 cameras) as: > ERROR: v4l2 capture: mxc_v4l_dqueue timeout enc_counter 0 > > It is strange to me because it doesn't occur every time when it runs here. > And although this problem occurs, finally those two old pipelines can be > removed and new pipelines can run correctly. The only problem is that it > will stuck for a while when errors happen. > > Is it the problem with the cameras themselves? > > Thanks in advance! > > _______________________________________________ > gstreamer-devel mailing list > gstreamer-devel@lists.freedesktop.org<mailto:gstreamer-devel@lists.freedesktop.org> > <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> > > > _______________________________________________ gstreamer-devel mailing list gstreamer-devel@lists.freedesktop.org <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </div> </body> </html>