please help, we've got some strange problem with RTP/RSTP

Marco Ballesio gibrovacco at
Mon Jul 25 13:22:37 PDT 2011


On Fri, Jul 22, 2011 at 6:43 AM, Farkas Levente <lfarkas at> wrote:
> hi,
> in short our rtsp server not working:-(
> but neither:
> - gst-rtsp-server,
> - vlc's rtsp server,
> - mplayer's live555.
> in a bit more detail, the setup:
> - we've got high resolution 2MP, 3MP, 5MP and high fps 12-25 fps ip
> cameras which has buildin rtsp server and can stream the video in rtsp.
> - our network is not perfect. there are a few pc which are behind 2-3-4
> switch (ie. the shortest path from one server to the client goes through
> 2-3-4 switch).
> what is always working:
> - if we connect from a pc directly to the ip cameras('s rtsp server)
> then we can get the proper video stream even with gstreamer, vlc etc.
> what is not always working:
> - if we create an rtsp server on pc (eg Wim's gst-rtsp-server) which do
> nothing just re-transmit the rtp stream from the camera with this
> pipeline on the server side:
> rtspsrc location=rtsp://admin:12345@ !
> rtph264depay ! rtph264pay name=pay0 pt=96
> and on the client side with this:
> gst-launch rtspsrc location="rtsp://" !
> decodebin2 ! xvimagesink
> then on some network segment we've got gray images most of the time.

Do you mean 100% gray images (same color for all the pixels) or a
grayscale version of the images generated from the camera?

> we try to replace both the client and then server to vlc and mplayer
> (just to know whether it's a gstreamer bug or not) and neither
> combination working. but if we connect directly to the camera it's
> always working with all clients.
> an even strange thing if we start to stream on the server side from an
> mkv file (with the high resolution high fps file) than the same thing
> happened on the client side. so the problem is not the source of the
> rtps server.
> one small tipp: if we lower the mtu to 300 (!) then it's working, but
> obviously we can't use this settings in a real environment.

How are you proxying the stream? Maybe you can share some code.


> so what can be the problem? any help would be useful.
> --
>  Levente                               "Si vis pacem para bellum!"
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