Concatenate 2 video files with transition

[Lusine]

Hi Folks,
I'm trying concatenate 2 video files with transition. I saw smpte element
and trying to use smpte with filesrc but the command hangs. 

gst-launch-1.0 filesrc location=~/videos/small1.mp4 ! decodebin !
videoconvert ! smpte name=s ! videoconvert ! x264enc ! mp4mux ! filesink
location=./out.mp4 filesrc location=~/videos/small2.mp4 ! decodebin !
videoconvert ! s. 

What am I doing wrong? 



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