[gst-devel] State change issues when asking for a RTSP stream with VLC

[Wim Taymans]

On Thu, 2009-03-05 at 10:28 +0100, Javier Gálvez Guerrero wrote:
> Hi,
> 
> I managed this issue by installing the UGLY plugins. However, I don't
> know if this is the proper way to solve my issue. 
> 
> Now I can get the RTSP stream (both from VLC and Live555 RTSP servers)
> but the video framerate is lower than the original and not stable. I
> have checked that all RTP packets are received (sequence numbers are
> ok) and I get neither error nor warning messages from Gstreamer, so I
> don't know what is happening and how I could get a smooth video
> playback in RTSP streaming (the same video played locally works
> smoothly). 
> 
> As said before, I have these problems since I updated Gstreamer from
> 0.8 to 0.10, so I don't know if there is any related issue with these
> problems or if I'm missing something. Anyway, I would like anyone to
> help me getting things working, either downgrading to 0.8 (I don't
> know where to find this version) or managing with the current 0.10
> version I've just installed.
> 

The mpeg demuxers don't support demuxing live streams yet and screw up
the timestamps, which makes the result rather choppy.

Wim
> 
> Thank you all,
> Javi
> 
> 
> 2009/3/4 Javier Gálvez Guerrero <javier.galvez.guerrero at gmail.com>
>         Hi there,
>         
>         I was using the Gstreamer framework (version 0.8) to get some
>         tests. I used Gstreamer as client and VLC (0.9.4) as RTSP
>         server and it worked smoothly. The problem has arised when
>         updating Gstreamer to 0.10.21. When I launch "gst-launch-0.10
>         playbin uri=rtsp://IP:PORT/content it never starts playing the
>         media. Using VLC as a client works ok.
>         
>         I can see with Wireshark the RTSP message exchange (PAUSE and
>         then TEARDOWN) and I get these error messages where launching
>         Gstreamer:
>         
>         Estableciendo el flujo a PAUSADO ... (PAUSED)
>         El flujo es en vivo y no necesita PRECACHEADO ... (PRECACHED)
>         Estableciendo el flujo para REPRODUCCIÓN ... (PLAY)
>         New clock: GstSystemClock
>         ERROR: desde el
>         elemento /GstPlayBin:playbin0/GstDecodeBin:decodebin0/ffdec_mpegvideo:ffdec_mpegvideo0: Internal GStreamer error: negotiation problem.  Please file a bug at http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer.
>         Información adicional de depurado:
>         gstffmpegdec.c(2339): gst_ffmpegdec_chain
>         (): /GstPlayBin:playbin0/GstDecodeBin:decodebin0/ffdec_mpegvideo:ffdec_mpegvideo0:
>         ffdec_mpegvideo: input format was not set before data start
>         Execution ended after 887032082 ns.
>         Estableciendo el flujo a PAUSADO ...
>         Estableciendo pipeline a READY...
>         Estableciendo pipeline a NULL...
>         LIBERANDO pipeline ... (FREEING)
>         
>         
>         I would like to know how I can solve this issue and, in case
>         the only solution is downgrading to gstreamer 0.8, could
>         anybody tell me where can I find it?
>         
>         By the way, as you may have noted, I am a newbie in the
>         Gstreamer framework, but I am quite interested in succeedin
>         using it. Any help would be much appreciated.
>         
>         
>         Thank you,
>         Javi
>         
> 
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