Time problem when adding source to videomixer

[longkas]

Hello,
The pipeline has one videomixer, at first it only takes a videotestsrc as
sink, now I want to play a video from file to add to the mixer, but the
video does not play from start, instead it starts from the time when added
to the pipeline, how can I make it play from start

videomixer name=mix ! autovideosink \ 
   videotestsrc ! videoconvert ! mix. \ 
   filesrc name=fsrc location=v.mp4 ! decodebin ! videoconvert ! mix. \ 



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