GSreamer and RTCP stream errors

[Fabio Cecamore]

Hello all,
i'm new of GStreamer and i'm getting a lot of troubles :)

I'm trying to stream a RTCP via loopback (/dev/video0) for use a IP CAM 
with a surveillance software (Motion).

I'm using latest v4l2loopback on a Debian with gstreamer-0.10 .

This is the problems:
sometimes when i launch with this command:
gst-launch rtspsrc location=rtsp://192.168.0.253/ch0_0.h264 ! decodebin 
! v4l2sink device=/dev/video0

it start with a warning, but work:
[begin]
Impostazione della pipeline a PAUSED ...
La pipeline è viva e non necessita il PREROLL ...
Impostazione della pipeline a PLAYING ...
New clock: GstSystemClock

** (gst-launch-0.10:1400): CRITICAL **: 
gst_v4l2sink_sync_overlay_fields: assertion `v4l2_ioctl (fd, 
VIDIOC_G_FMT, &format) >= 0' failed
[end]
And I've a good stream.


But sometimes it didn't with this error:
[begin]
Impostazione della pipeline a PAUSED ...
La pipeline è viva e non necessita il PREROLL ...
Impostazione della pipeline a PLAYING ...
New clock: GstSystemClock
ERRORE: dall'elemento 
/GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc3: Errore 
interno nel flusso di dati.
Informazioni di debug aggiuntive:
gstbasesrc.c(2550): gst_base_src_loop (): 
/GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc3:
streaming task paused, reason not-linked (-1)
Execution ended after 159787077 ns.
Impostazione della pipeline a PAUSED ...
Impostazione della pipeline a READY ...
Impostazione della pipeline a NULL ...
Caught SIGSEGV accessing address 0x28
Spinning.  Please run 'gdb gst-launch 1366' to continue debugging, 
Ctrl-C to quit, or Ctrl-\ to dump core.
[end]

The command is absolutly the same all time.
Any help is appreciated.

Thank you