topic Re: matroskamux issue with multi-threaded GStreamer Application in i.MX Processors

matroskamux issue with multi-threaded GStreamer Application

sumanranjan — Thu, 12 Jun 2014 10:55:30 GMT

I am using yocto dora branch for IMX6 SabreSD board. I have written a GStreamer application which can save video streams from multiple cameras into .mkv format simultaneously.

The pipeline used in the program to store video stream in .mkv format is given below,

gst-launch rtspsrc location=rtsp://10.20.1.48/axis-media/media.amp typefind=true ! rtph264depay queue-delay=0 ! capsfilter caps="video/x-h264,width=640,height=480,framerate=(fraction)30/1" ! matroskamux ! filesink location=test.mkv

As long as I run the program with single camera stream it works all the time. When I switch to multi-threading to get streams from multiple cameras I see in-consistency due to "matroskamux" plugin. It works 2-out-of-5 times kind of behaviour. If I remove the plugin from pipeline and save the raw stream in .264 format directly then there is no problem with the application.

(GSTApp:1718): GLib-GObject-WARNING **: cannot register existing type `GstMatroskamuxPad'

(GSTApp:1718): GLib-GObject-CRITICAL **: g_object_new: assertion `G_TYPE_IS_OBJECT (object_type)' failed

Segmentation fault

My same application works fine on phytec board. I do not have phytec sources to diff "matroskamux" plugin right now.

Plugin Versions :

/gstreamer/0.10.36-r2/

/gst-plugins-good-0.10.31/gst/matroska

Has anyone encountered such an issue with "matroskamux" plugin in multi-threading scenario.

~Suman

Re: matroskamux issue with multi-threaded GStreamer Application

joanxie — Wed, 25 Jun 2014 07:16:51 GMT

as I known, no one has tested matroskamux for this case, it seems that MKV muxer has issue for this, maybe you can try to use mpegtsmux to replace matroskamux, or other muxer, I send the gstreamer plugins Reference Manula, hope helpful for you.

<http://gstreamer.freedesktop.org/documentation/plugins.html>.

Re: matroskamux issue with multi-threaded GStreamer Application

sumanranjan — Wed, 25 Jun 2014 08:42:38 GMT

Thanks Xie..I got around this problem exactly the way you have mentioned. I used 'mpegtsmux' plugin in place of matroskamux.

Re: matroskamux issue with multi-threaded GStreamer Application

joanxie — Wed, 25 Jun 2014 09:25:53 GMT

great, if you have fixed this issue, do you mind closing this thread?