playbin2 without sync=false no video

[Mohamed Salim Mohamed Ayub]

I am having some mpeg2 videos and when trying to play then with
gst-launch -v playbin2 uri=file:///<file>
, there is hang after New clock mesasage.
Apparently decoder is not decoding anything

But when I use gst-launch -v playbin2 uri=file:///<file> <child
path>::sync=false,
I can see the video.

What might be going wrong without sync=false?

Kindest Regards,
Salim
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