Overlaying an image on a live stream

[kususe]

I modified the presented pipeline to overlay an image onto a video:

gst-launch filesrc location=video.mpg ! decodebin2 ! videomixer name=mix !
xvimagesink filesrc location=graph.png ! pngdec ! ffmpegcolorspace ! mix.

but it stops always in the "prerolling moment" and if I press CTRL-C, it
returns: 

(gst-launch-0.10:3775): GStreamer-WARNING **: adding flushing pad 'sink_1'
to running element 'mix', you need to use gst_pad_set_active(pad,TRUE)
before adding it.


Suggestions??

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