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

Zaheer Merali zaheerabbas at merali.org
Fri Mar 6 13:31:11 CET 2009 

On Fri, Mar 6, 2009 at 10:56 AM, Javier Gálvez Guerrero
<javier.galvez.guerrero at gmail.com> wrote:
> Hi,
>
> I solved it. I have installed the "bad" plugins compilation and now I get
> smooth RTP/MPEG-TS playback. I suppose it is because the mplex element.
>
> Regards,
> Javi

It was probably one of the mpeg demuxers mpegpsdemux or mpegtsdemux
inside gst-plugins-bad that solved your problem.

Zaheer

>
> 2009/3/5 Javier Gálvez Guerrero <javier.galvez.guerrero at gmail.com>
>>
>> Gstreamer MPEG demuxing is in charge of ffmpeg, isn't it? I have updated
>> ffmpeg to the latest git version but it hasn't solved anything. I have also
>> uninstalled the fluendo MPEG muxers and demuxers plugins with no positive
>> results.
>>
>> On the other hand, multicast streaming (not RTSP) MPEG over UDP is played
>> back smoothly, as local files do.
>>
>> Has anyone any idea about why I could play properly RTSP/RTP streaming
>> contents before and now I get choppy playback?
>>
>>
>> Thank you for your time and sorry for the inconvenience,
>> Javi
>>
>>
>> 2009/3/5 Javier Gálvez Guerrero <javier.galvez.guerrero at gmail.com>
>>>
>>> Thanks for your answer, Wim.
>>>
>>> So, Gstreamer 0.8 MPEG demuxers worked but those used in 0.10 are not
>>> working properly?
>>>
>>>
>>> Regards,
>>> Javi
>>>
>>> 2009/3/5 Wim Taymans <wim.taymans at gmail.com>
>>>>
>>>> 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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