gstreamer with RTP

[Overflow10]

Hi, I'm trying to write a RTP stream to a file and read it with gstreamer.
My pipeline to convert a video test to RTP is:
gst-launch-1.0 -tv videotestsrc do-timestamp=1 ! vp8enc ! rtpvp8pay !
filesink location=/tmp/test.rtp 

in the output I have this caps:
"application/x-rtp\,\ media\=\(string\)video\,\ clock-rate\=\(int\)90000\,\
encoding-name\=\(string\)VP8-DRAFT-IETF-01\,\ payload\=\(int\)96\,\
ssrc\=\(uint\)1427543371\,\ timestamp-offset\=\(uint\)4027906677\,\
seqnum-offset\=\(uint\)26411"

and then I read the rtp file as:
gst-launch-1.0 filesrc location=/tmp/test.rtp ! "application/x-rtp,
media=(string)video, clock-rate=(int)90000,
encoding-name=(string)VP8-DRAFT-IETF-01, payload=(int)96,
ssrc=(uint)1427543371, timestamp-offset=(uint)4027906677,
seqnum-offset=(uint)26411" !  rtpvp8depay ! vp8dec ! videoconvert !
xvimagesink

I show for millisecond the test image, but in the output I read "Received
invalid RTP payload, dropping".
What is the problem?
Thanks.



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