<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 12 (filtered medium)"> <style>  </style>  </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> Hi,<o:p></o:p> <o:p> </o:p> I am trying to build rtsp streamer test application based on gstreamer’s example rtsp application.  Please find the code attached.<o:p></o:p> <o:p> </o:p> In the streamer I create 2 rtsp_media_factories with launch strings <o:p></o:p> <o:p> </o:p> "appsrc name=aps is-live=true block=true !  video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace ! videoscale ! video/x-raw-yuv,width=320,height=240 ! x264enc ! rtph264pay name=pay0 pt=96"<o:p></o:p> <o:p> </o:p> "appsrc name=aps ! ffmpegcolorspace ! videoscale ! video/x-raw-yuv,width=176,height=120 ! videorate ! video/x-raw-yuv,framerate=10/1 ! ffenc_mpeg4 ! rtpmp4vpay name=pay0 pt=96"<o:p></o:p> <o:p> </o:p> I have derived GstRTSPMediaFactory  and implemented a class which has modifications in custom_get_element().  (Gets appsrc element from pipeline which is later used to push data into the pipeline) <o:p></o:p> <o:p> </o:p> The mainline code has a persistent pipeline : "videotestsrc is-live=true ! video/x-raw-yuv,width=320,height=240 ! appsink name=apsink max-buffers=10 drop=true". This keeps on running and appsink will keep dropping old buffers.<o:p></o:p> <o:p> </o:p> Whenever a client connects to server, as per the design of rtsp server, it creates corresponding pipeline starting from appsrc and then appsink starts pushing buffers to that pipeline.<o:p></o:p> <o:p> </o:p> I am facing a couple of problems here and need some clarifications.<o:p></o:p> <o:p> </o:p> <![if !supportLists]>1.       <![endif]>As soon as client connects (Vlc player)  it displays first frame and it freezes for 30 to 60 seconds, then it continues displaying video. When this happens I get following errors. This is also inconsistent sometimes it doesn’t play video for minutes.<o:p></o:p> 0:00:03.470756887  4570  0x821c098 WARN                     bin gstbin.c:2384:gst_bin_do_latency_func:<media-pipeline> failed to query latency<o:p></o:p> 0:00:03.471939373  4570  0x83df298 WARN               videorate gstvideorate.c:691:gst_video_rate_event:<videorate0> Got segment but doesn't have GST_FORMAT_TIME value<o:p></o:p> 0:00:03.881337049  4570  0x83df298 WARN                basesink gstbasesink.c:3626:gst_base_sink_chain_unlocked:<multiudpsink0> warning: Internal data flow problem.<o:p></o:p> 0:00:03.881364737  4570  0x83df298 WARN                basesink gstbasesink.c:3626:gst_base_sink_chain_unlocked:<multiudpsink0> warning: Received buffer without a new-segment. Assuming timestamps start from 0.<o:p></o:p> 0:00:03.887089513  4570  0x8329c00 WARN               rtspmedia rtsp-media.c:1511:default_handle_message: 0x83270d0: got warning Internal data flow problem. (gstbasesink.c(3626): gst_base_sink_chain_unlocked (): /GstPipeline:media-pipeline/GstMultiUDPSink:multiudpsink0:<o:p></o:p> <o:p> </o:p> I guess I could do away with multiudpsink error by setting its “sync” property to false (because I did the same thing with ximagesink earlier and it worked) but I am not aware of its side effects. Will there be any problems if I do that?<o:p></o:p> <o:p> </o:p> <![if !supportLists]>2.       <![endif]>How to solve errors related with videorate?<o:p></o:p> <o:p> </o:p> I want to understand root cause of this problem. Am I missing something here? Any suggestions or explanations will be extremely helpful.<o:p></o:p> <o:p> </o:p> Thanks and Regards,<o:p></o:p> Swaroop<o:p></o:p> <o:p> </o:p> <o:p> </o:p> <o:p> </o:p> </div> </body> </html>