hi,all:    I want to receive H.264 live stream and convert to MPEG2 TS and save to *.ts file. VIDEO_CAPS="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264" LATENCY=200 this is my command: gst-launch -v gstrtpbin name=rtpbin latency=$LATENCY \      udpsrc caps=$VIDEO_CAPS port=4234 ! rtph264depay ! queue ! ffmux_mpegts ! queue ! filesink location=h264_mp2t.ts but, I receive error log as follow: Any one can help me!! Setting pipeline to PAUSED ... /GstPipeline:pipeline0/GstUDPSrc:udpsrc0.GstPad:src: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)96 Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock /GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay0.GstPad:src: caps = video/x-h264 /GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay0.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)96 /GstPipeline:pipeline0/GstQueue:queue0.GstPad:sink: caps = video/x-h264 /GstPipeline:pipeline0/GstQueue:queue0.GstPad:src: caps = video/x-h264 /GstPipeline:pipeline0/ffmux_mpegts:ffmux_mpegts0.GstPad:video_0: caps = video/x-h264 ERROR: from element /GstPipeline:pipeline0/ffmux_mpegts:ffmux_mpegts0: Could not configure supporting library. Additional debug info: gstffmpegmux.c(551): gst_ffmpegmux_collected (): /GstPipeline:pipeline0/ffmux_mpegts:ffmux_mpegts0: Failed to write file header - check codec settings Execution ended after 19881715 ns. Setting pipeline to PAUSED ... Setting pipeline to READY ... /GstPipeline:pipeline0/ffmux_mpegts:ffmux_mpegts0.GstPad:video_0: caps = NULL /GstPipeline:pipeline0/ffmux_mpegts:ffmux_mpegts0.GstPad:src: caps = NULL /GstPipeline:pipeline0/GstQueue:queue0.GstPad:src: caps = NULL /GstPipeline:pipeline0/GstQueue:queue0.GstPad:sink: caps = NULL /GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay0.GstPad:src: caps = NULL /GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay0.GstPad:sink: caps = NULL /GstPipeline:pipeline0/GstUDPSrc:udpsrc0.GstPad:src: caps = NULL Setting pipeline to NULL ... Freeing pipeline ... <hr/> <a href="http://allyes.nie.163.com/main/adfclick?db=afanie&bid=1254,611,23&cid=145,4,1&sid=1351&show=ignore&url=http://tx2.163.com/fab.html">09年新晋3D主流网游《天下贰》，网易六年亿资打造</a>