gst-launch "properties of properties" syntax

[Sepehr Laal]

I have been trying out different syntaxes since yesterday but I cannot
figure this out. Basically I want to set name and caps properties of
appsink in playbin pipeline and launch it via gst-launch. For example (not
working):

gst-launch playbin uri=/path/to/vid.mp4
video-sink=appsink,name=appsink0,caps=video/x-raw,width=3840,height=2160,format=RGB

How do I properly set the caps and name parameters for appsink in the
playbin above?

thanks in advance
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