Webrtc with gstreamer in java

[sej]

Hi,
I'm trying to connect  a java server with gstreamer and webrtc to a
differents browsers.
I'va already got that the java server and the clients negotiate the sdp
necessary to comunicate through webrtc, but when the video is sended, the
server throw the next error:
*- [gstreamer service thread 1] ERROR - Error from source: 'BaseSrc:
[udpsrc88]', with code: 1, and message 'Internal data stream error.'
*
For more info, i'm following something like the next exapmple to make the
java server:
- https://github.com/centricular/gstwebrtc-demos
And the pipeline that i'm putting to send the video is the next one:
- "rtspsrc
location=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov
latency=0  ! rtph264depay ! avdec_h264 ! videoconvert ! queue ! videoconvert
! video/x-raw ! vp8enc ! rtpvp8pay"

As i say, the communication with the client works well, but when the
negotiation is done and the client is connected to the server, the server
throws the error above. 
Has anyone tried to do something similar or know what the error refers to?

Thanks in advance



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