Gstreamer mux, caps refused

[Ferdinand Wörister]

Hi!

I'm using the following pipeline (SIMPLIFIED) in Gstreamer OSS Build 
0.10.7 on Win 7 x64:

     udpsrc ! application/x-rtp, media=(string)video, 
clockrate=(int)90000, encoding-name=(string)H264,        payload=(int)96 !
     gstrtpjitterbuffer latency=200 ! rtph264depay ! tee name=h264Tee

     h264Tee. ! queue ! h264parse ! mux.

     matroskamux name=mux ! filesink location=rec.mkv sync=false // same 
for avimux/mp4/qt

     h264Tee. ! queue ! ffdec_h264 ! tee name=videoTee

     //.videoTee ! queue ! dx9videosink
     //.videoTee ! queue ! appsink

     //udpsrc ! queue ! directsoundsink

     audiotestsrc ! mux. //only for testing, should be connected to udpsrc

The pipeline is launched via Gstreamer-Sharp.
Here's the console output of the pipeline:

     WARN default xoverlay.c:354:gst_x_overlay_set_xwindow_id 
<videoSink> Using deprecated gst_x_overlay_set_xwindow_id()
     ERROR d3dvideosink 
d3dvideosink.c:2204:gst_d3dvideosink_release_swap_chain: Direct3D device 
has not been initialized
     WARN bin gstbin.c:2378:gst_bin_do_latency_func:<pipeline0> failed 
to query latency
     WARN matroskamux 
matroska-mux.c:970:gst_matroska_mux_video_pad_setcaps:<mux> pad video_0 
refused caps 05370C40

Both video and audio are playing just fine as long as I leave out the 
muxer. When include the muxer in the pipeline, the video freezes 
immedeately and no sound can be heard. What's wrong why does the muxer 
refuse the caps?

Thanks advance,
Ferdinand