sdpdemux fails if not explicitly added to the pipeline

Submitted by eri..@..ene.de

Link to original bug (#702495)

Description

Created attachment 247054
sdp file

Steps to reproduce:

1. Create a send-pipeline with
   gst-launch-1.0 videotestsrc ! x264enc ! h264parse ! rtph264pay ! udpsink host=127.0.0.1 port=5000

2. With the attached sdp-file launch this pipeline:
   gst-launch-1.0 -v filesrc location=stream.sdp ! decodebin ! autovideosink

This won't show any video.
Same pipeline works with GStreamer 0.10.

Now lets add the a sdpdemux element to the pipeline:
gst-launch-1.0 -v filesrc location=stream.sdp ! sdpdemux ! decodebin ! autovideosink
Result: A Video is shown.

But for some reason with the original pipeline its not.

Attachment 247054, "sdp file":
stream.sdp

Version: 1.0.7