<div dir="ltr">Hi, Aurelien:     Thanks guys. I tried the way Aurelien mentioned and found out that when I play separate video or audio streams -- that was OK. But if I combine the two gst-launch command, error occurs. I think maybe this is a bug with decodebin or gst-launch. According to the error message, seems that the reason is trying to play the stream while the pipeline was not linked completely.     Next I am going to upgrade the gstreamer, including all plugin packages, then try again. Thanks for all helps. Eric Zhang <div class="gmail_quote">2008/9/9 Aurelien Grimaud <<a href="mailto:gstelzz@yahoo.fr">gstelzz@yahoo.fr</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font-family: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; font-size: inherit; line-height: inherit; font-size-adjust: inherit; font-stretch: inherit;" valign="top"> Do you use CVS Head ? Have you got video with gst-launch -v rtspsrc location="rtsp://localhost/test.mp4" debug=1 ! "application/x-rtp, media=video" ! decodebin ! xvimagesink Have you got audio with gst-launch -v rtspsrc location="rtsp://localhost/test.mp4" debug=1 ! "application/x-rtp, media=audio" ! decodebin ! audioconvert ! alsasink To figure out which are the differences between two pipelines (playbin/decodebin), one can dump dot files and draw graphs. export GST_DEBUG_DUMP_DOT_DIR=/tmp gst-launch ... dot files will be generated on every pipeline state change.(since gstreamer-0.10.18) Aurelien --- En date de : Mar 9.9.08, Eric Zhang <<a href="mailto:nicolas.m.zhang@gmail.com" target="_blank">nicolas.m.zhang@gmail.com</a>> a écrit : <blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"> De: Eric Zhang <<a href="mailto:nicolas.m.zhang@gmail.com" target="_blank">nicolas.m.zhang@gmail.com</a>> Objet: Re: [gst-devel] Decodebin doesn't work whereas playbin works, why? À: "Discussion of the development of GStreamer" <<a href="mailto:gstreamer-devel@lists.sourceforge.net" target="_blank">gstreamer-devel@lists.sourceforge.net</a>> Date: Mardi 9 Septembre 2008, 3h14<div><div></div><div class="Wj3C7c"> <div><div dir="ltr">Hi, Jens:     Thanks for your reply but it doesn't work. Rtspsrc isn't like http-src element, the video & audio stream are separated in it while not been separated in any demux element. So that means there are 2 streams coming from rtspsrc and each of them should be connected to a decodebin.     I tried the command you mentioned, the result is - nothing happened. The output is: ============================== eric@eric-desktop:~$ gst-launch rtspsrc location="rtsp://localhost/test.mp4" protocols=1 ! decodebin name=d ! queue ! ffmpegcolorspace ! xvimagesink  d. ! queue ! audioconvert ! alsasink Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock ============================== Eric Zhang <div class="gmail_quote"> 2008/9/8 Jens Persson <<a rel="nofollow" href="mailto:xerxes2@gmail.com" target="_blank">xerxes2@gmail.com</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hmm, try this instead: gst-launch rtspsrc location="rtsp://localhost/test.mp4" protocols=1 ! decodebin name=d ! queue ! ffmpegcolorspace ! xvimagesink  d. ! queue ! audioconvert ! alsasink Greets Jens <div><div></div><div> Eric Zhang wrote: > Hi, gstreamer: > >     Recently, I wanna play movies from a rtsp server. I installed > DarwinStreamServer on my laptop and use command line: > >     gst-launch playbin uri="rtsp://localhost/test.mp4" > >     It works well. But if I use decodebin instead of playbin, error > occurs: > >     gst-launch rtspsrc location="rtsp://localhost/test.mp4" > protocols=1 name=d d. ! decodebin ! queue ! ffmpegcolorspace ! > xvimagesink d. ! decodebin ! queue ! audioconvert ! alsasink > >     The error message is: > > ========================= > Setting pipeline to PAUSED ... > Pipeline is live and does not need PREROLL ... > Setting pipeline to PLAYING ... > New clock: GstSystemClock > ERROR: from element /pipeline0/d/udpsrc0: Internal data flow error. > Additional debug info: > gstbasesrc.c(2240): gst_base_src_loop (): /pipeline0/d/udpsrc0: > streaming task paused, reason not-linked (-1) > Execution ended after 117342031 ns. > Setting pipeline to PAUSED ... > Setting pipeline to READY ... > Setting pipeline to NULL ... > FREEING pipeline ... > ================================== > >     I noticed sometimes decodebin works but mostly it fails. What > tricks does playbin do to make it work? I skimed the source codes of > playbin and found out that it also use decodebin inside. > >     Thanks a lot. I really appreciate your suggestions. > > Eric Zhang </div></div>> ------------------------------------------------------------------------ > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > <a rel="nofollow" href="http://moblin-contest.org/redirect.php?banner_id=100&url=/" target="_blank">http://moblin-contest.org/redirect.php?banner_id=100&url=/</a> > ------------------------------------------------------------------------ > > _______________________________________________ > gstreamer-devel mailing list > <a rel="nofollow" href="mailto:gstreamer-devel@lists.sourceforge.net" target="_blank">gstreamer-devel@lists.sourceforge.net</a> > <a rel="nofollow" href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world <a rel="nofollow" href="http://moblin-contest.org/redirect.php?banner_id=100&url=/" target="_blank">http://moblin-contest.org/redirect.php?banner_id=100&url=/</a> _______________________________________________ gstreamer-devel mailing list <a rel="nofollow" href="mailto:gstreamer-devel@lists.sourceforge.net" target="_blank">gstreamer-devel@lists.sourceforge.net</a> <a rel="nofollow" href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote></div> </div> </div><pre>------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world <a href="http://moblin-contest.org/redirect.php?banner_id=100&url=/" target="_blank">http://moblin-contest.org/redirect.php?banner_id=100&url=/</a></pre> <pre>_______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net" target="_blank">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </pre></div></div></blockquote></td></tr></tbody></table> ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world <a href="http://moblin-contest.org/redirect.php?banner_id=100&url=/" target="_blank">http://moblin-contest.org/redirect.php?banner_id=100&url=/</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote></div> </div>