<div dir="ltr">First, use gst-inspect for both the h264parse and vaapidecode to see if the pad caps are compatible. It seems that they must not be. Then put a caps filter between them. There are examples of using a caps filter in the documentation. You can also enable/increase logging to see why it is failing to link the pipeline. Start slow because some of the filters generate a lot of messages. Pick the ones that are responsible for the linking and increase the logging level on those. I think GST_ELEMENTS may be the primary element of interest. Enable logging with export GST_DEBUG=*:3 to start, replace the * with element names and '3' with 4 or 5. </div><div class="gmail_extra"> <div class="gmail_quote">On Thu, Feb 20, 2014 at 2:33 AM, Jaya <<a href="mailto:j.budihal@gmail.com" target="_blank">j.budihal@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Hi, I have done a VA API installation on CentOS 6.4 ,this is a list of the packages i have installed : - libdrm-2.4.52 - libva-1.2.1 - libva-intel-driver-1.2.2 - gstreamer-vaapi-0.5.8 However, this below pipeline gives an error gst-launch-1.0 filesrc location=file.mp4 ! qtdemux ! h264parse ! vaapidecode ! fakesink --gst-debug=3 output: 0:00:00.017503778 10458 0x2432860 ERROR vaapidecode gstvaapidecode.c:931:gst_vaapidecode_ensure_allowed_caps: failed to retrieve VA display 0:00:00.017681818 10458 0x2432860 ERROR vaapidecode gstvaapidecode.c:931:gst_vaapidecode_ensure_allowed_caps: failed to retrieve VA display 0:00:00.017984945 10458 0x2432860 ERROR GST_PIPELINE ./grammar.y:624:gst_parse_perform_link: could not link h264parse0 to vaapidecode0 WARNING: erroneous pipeline: could not link h264parse0 to vaapidecode0 How do I the solve the linking issue from h264parse to vaapidecode Thanks. -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Error-in-linking-h264parse-to-vaapidecode-tp4665390.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Error-in-linking-h264parse-to-vaapidecode-tp4665390.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div> </div>