Overlaying an image on a video

kususe kususe at interfree.it
Thu Mar 1 11:40:51 PST 2012

I want to code a pipeline to overlay an image on a video. 
First I would like to understand how to implement this one and then to code
So I attemped with this: 

gst-launch filesrc location=/home/boss/test/video.mpg ! decodebin2 !
videomixer name=mix ! xvimagesink filesrc location =
/home/boss/test/image.png ! pngdec ! ffmpegcolorspace ! mix

but I got: "pipeline wrong. No element called mix"

Thanks in advance

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