<div dir="ltr">After setting GST_DEBUG=3, I found those following error information: ...................................................................................................... 0:00:02.830674461 [336m 2063[00m 0x102920 [32;01mINFO [00m [00;01;37;41m    GST_ELEMENT_PADS gstelement.c:641:gst_element_add_pad:<rtpptdemux1>[00m adding pad 'src_96' 0:00:02.834983692 [336m 2063[00m 0x102920 [32;01mINFO [00m [00;01;37;41m            GST_PADS gstpad.c:1769:gst_pad_link_prepare:[00m trying to link rtpptdemux1:src_96 and recv_rtp_src_0_547059553_96:proxypad6 0:00:02.836655076 [336m 2063[00m 0x102920 [32;01mINFO [00m [00;01;37;41m            GST_PADS gstpad.c:1906:gst_pad_link:[00m linked rtpptdemux1:src_96 and recv_rtp_src_0_547059553_96:proxypad6, successful 0:00:02.838054769 [336m 2063[00m 0x102920 [32;01mINFO [00m [00;01;37;41m    GST_ELEMENT_PADS gstelement.c:641:gst_element_add_pad:<rtpbin0>[00m adding pad 'recv_rtp_src_0_547059553_96' 0:00:02.842733230 [336m 2063[00m 0x102920 [32;01mINFO [00m [00;01;37;41m            GST_PADS gstpad.c:1769:gst_pad_link_prepare:[00m trying to link rtpbin0:recv_rtp_src_0_547059553_96 and recv_rtp_src_0_547059553_96:proxypad7 0:00:02.845067076 [336m 2063[00m 0x102920 [32;01mINFO [00m [00;01;37;41m            GST_PADS gstpad.c:1906:gst_pad_link:[00m linked rtpbin0:recv_rtp_src_0_547059553_96 and recv_rtp_src_0_547059553_96:proxypad7, successful 0:00:02.846058153 [336m 2063[00m 0x102920 [32;01mINFO [00m [00;01;37;41m    GST_ELEMENT_PADS gstelement.c:641:gst_element_add_pad:<rtspsrc0>[00m adding pad 'recv_rtp_src_0_547059553_96' 0:00:02.850103692 [336m 2063[00m 0xe9d08 [33;01mWARN [00m [00m           rtpsource rtpsource.c:809:calculate_jitter:[00m cannot get current time 0:00:02.855280615 [336m 2063[00m 0xd3d48 [32;01mINFO [00m [00;01;37;41m    GST_ELEMENT_PADS gstelement.c:641:gst_element_add_pad:<rtpptdemux0>[00m adding pad 'src_97' 0:00:02.859652307 [336m 2063[00m 0xd3d48 [32;01mINFO [00m [00;01;37;41m            GST_PADS gstpad.c:1769:gst_pad_link_prepare:[00m trying to link rtpptdemux0:src_97 and recv_rtp_src_1_1101393272_97:proxypad8 0:00:02.861467999 [336m 2063[00m 0xd3d48 [32;01mINFO [00m [00;01;37;41m            GST_PADS gstpad.c:1906:gst_pad_link:[00m linked rtpptdemux0:src_97 and recv_rtp_src_1_1101393272_97:proxypad8, successful 0:00:02.862773846 [336m 2063[00m 0xd3d48 [32;01mINFO [00m [00;01;37;41m    GST_ELEMENT_PADS gstelement.c:641:gst_element_add_pad:<rtpbin0>[00m adding pad 'recv_rtp_src_1_1101393272_97' 0:00:02.867528616 [336m 2063[00m 0xd3d48 [32;01mINFO [00m [00;01;37;41m            GST_PADS gstpad.c:1769:gst_pad_link_prepare:[00m trying to link rtpbin0:recv_rtp_src_1_1101393272_97 and recv_rtp_src_1_1101393272_97:proxypad9 0:00:02.870068923 [336m 2063[00m 0xd3d48 [32;01mINFO [00m [00;01;37;41m            GST_PADS gstpad.c:1906:gst_pad_link:[00m linked rtpbin0:recv_rtp_src_1_1101393272_97 and recv_rtp_src_1_1101393272_97:proxypad9, successful 0:00:02.871187077 [336m 2063[00m 0xd3d48 [32;01mINFO [00m [00;01;37;41m    GST_ELEMENT_PADS gstelement.c:641:gst_element_add_pad:<rtspsrc0>[00m adding pad 'recv_rtp_src_1_1101393272_97' 0:00:02.874814770 [336m 2063[00m 0x130f0 [32;01mINFO [00m [00;01;31m          GST_STATES gstelement.c:2148:gst_element_continue_state:<udpsrc0>[00m completed state change to PLAYING 0:00:02.875670462 [336m 2063[00m 0x130f0 [32;01mINFO [00m [00;01;31m          GST_STATES gstelement.c:2161:gst_element_continue_state:<udpsrc0>[00m posting state-changed PAUSED to PLAYING 0:00:02.878230461 [336m 2063[00m 0xd2cd0 [33;01mWARN [00m [00m           rtpsource rtpsource.c:809:calculate_jitter:[00m cannot get current time 0:00:02.879399999 [336m 2063[00m 0xd2cd0 [32;01mINFO [00m [00m             basesrc gstbasesrc.c:2114:gst_base_src_loop:<udpsrc0>[00m pausing after gst_pad_push() = not-linked 0:00:02.880337538 [336m 2063[00m 0xd2cd0 [33;01mWARN [00m [00m             basesrc gstbasesrc.c:2165:gst_base_src_loop:<udpsrc0>[00m error: Internal data flow error. 0:00:02.881175692 [336m 2063[00m 0xd2cd0 [33;01mWARN [00m [00m             basesrc gstbasesrc.c:2165:gst_base_src_loop:<udpsrc0>[00m error: streaming task paused, reason not-linked (-1) 0:00:02.882491384 [336m 2063[00m 0xd2cd0 [32;01mINFO [00m [00;01;31;47m    GST_ERROR_SYSTEM gstelement.c:1674:gst_element_message_full:<udpsrc0>[00m posting message: Internal data flow error. 0:00:02.884321230 [336m 2063[00m 0xd2cd0 [32;01mINFO [00m [00;01;31;47m    GST_ERROR_SYSTEM gstelement.c:1697:gst_element_message_full:<udpsrc0>[00m posted error message: Internal data flow error. 0:00:02.886078769 [336m 2063[00m 0xe9d08 [33;01mWARN [00m [00m           rtpsource rtpsource.c:809:calculate_jitter:[00m cannot get current time 0:00:02.876917231 [336m 2063[00m 0x130f0 [32;01mINFO [00m [00;01;31m          GST_STATES gstbin.c:2191:gst_bin_change_state_func:<rtspsrc0>[00m child 'udpsrc0' changed state to 4(PLAYING) successfully 0:00:02.888022461 [336m 2063[00m 0x130f0 [32;01mINFO [00m [00;01;31m          GST_STATES gstelement.c:2148:gst_element_continue_state:<rtspsrc0>[00m completed state change to PLAYING 0:00:02.888841845 [336m 2063[00m 0x130f0 [32;01mINFO [00m [00;01;31m          GST_STATES gstelement.c:2161:gst_element_continue_state:<rtspsrc0>[00m posting state-changed PAUSED to PLAYING 0:00:02.889984922 [336m 2063[00m 0xe9d08 [32;01mINFO [00m [00m             basesrc gstbasesrc.c:2114:gst_base_src_loop:<udpsrc2>[00m pausing after gst_pad_push() = not-linked 0:00:02.890959999 [336m 2063[00m 0xe9d08 [33;01mWARN [00m [00m             basesrc gstbasesrc.c:2165:gst_base_src_loop:<udpsrc2>[00m error: Internal data flow error. 0:00:02.891727076 [336m 2063[00m 0xe9d08 [33;01mWARN [00m [00m             basesrc gstbasesrc.c:2165:gst_base_src_loop:<udpsrc2>[00m error: streaming task paused, reason not-linked (-1) 0:00:02.892926153 [336m 2063[00m 0xe9d08 [32;01mINFO [00m [00;01;31;47m    GST_ERROR_SYSTEM gstelement.c:1674:gst_element_message_full:<udpsrc2>[00m posting message: Internal data flow error. 0:00:02.894355076 [336m 2063[00m 0xe9d08 [32;01mINFO [00m [00;01;31;47m    GST_ERROR_SYSTEM gstelement.c:1697:gst_element_message_full:<udpsrc2>[00m posted error message: Internal data flow error. 0:00:02.896006461 [336m 2063[00m 0x130f0 [32;01mINFO [00m [00;01;31m          GST_STATES gstelement.c:2148:gst_element_continue_state:<rtpxqtdepay0>[00m completed state change to PLAYING 0:00:02.896863692 [336m 2063[00m 0x130f0 [32;01mINFO [00m [00;01;31m          GST_STATES gstelement.c:2161:gst_element_continue_state:<rtpxqtdepay0>[00m posting state-changed PAUSED to PLAYING GST_MESSAGE_ERROR udpsrc2 error: Internal data flow error. Debug: gstbasesrc.c(2165): gst_base_src_loop (): /pipeline/rtspsrc0/udpsrc2: streaming task paused, reason not-linked (-1)       NULL ................................................................................................ the main error is "not-linked". I'm wondering why there generates two recv_rtp_src: recv_rtp_src_1_1101393272_97 and recv_rtp_src_0_547059553_96. It seems that with one recv_rtp_src, the program can work fine. <div class="gmail_quote">On Wed, Jul 16, 2008 at 10:56 AM, Ting Wang <<a href="mailto:wangting@gmail.com">wangting@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div dir="ltr">Hello, I'm using rtspsrc, the command: /mnt/Temp/felix_tmp/output # ../bin/gst-launch rtspsrc location=rtsp://<a href="http://10.38.38.150/sample_100kbit.mp4" target="_blank">10.38.38.150/sample_100kbit.mp4</a> ! fakesink works OK, and my streaming server is up and in good condition, but when issuing the command: /mnt/Temp/felix_tmp/output # ../bin/gst-launch rtspsrc location=rtsp://<a href="http://10.38.38.150/sample_100kbit.mp4" target="_blank">10.38.38.150/sample_100kbit.mp4</a> ! gstrtpjitterbuffer ! rtph264depay ! h264dec ! overlay2sink I got the following error message: Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock ERROR: from element /pipeline0/rtspsrc0/udpsrc2: Internal data flow error. Additional debug info: gstbasesrc.c(2165): gst_base_src_loop (): /pipeline0/rtspsrc0/udpsrc2: streaming task paused, reason not-linked (-1) Execution ended after 216414462 ns. Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... overlay2 unmap error! FREEING pipeline ... What could have caused "Internal data flow error"?  Would someone please give me some advice? Thank you very much :) Best regards Felix </div> </blockquote></div> </div>